長野 克則 (ナガノ カツノリ)

工学研究院 環境工学部門 環境工学教授
高等教育推進機構教授
Last Updated :2025/01/11

■研究者基本情報

学位

  • 博士(工学), 北海道大学

プロフィール情報

  • 【学歴】

    1983年 3月 北海道大学 工学部卒業

    1984年 4月 北海道大学 大学院工学研究科修士課程 入学

    1986年 3月 同上 修了


    【職歴】

    1986年 4月 東京ガス(株)入社

    1988年 3月 同上 退社

    1988年 4月 北海道大学 工学部 助手

    1995年10月 北海道大学 工学部 助教授

    1997年10月 北海道大学 大学院工学研究科 助教授

    2006年 4月 北海道大学 大学院工学研究科 教 授

    2010年 4月 北海道大学 大学院工学研究院 教 授

    2013年 4月 北海道大学 役員補佐(国際本部)

    2014年 4月 北海道大学 総長補佐(~2017年 3月)

    現在に至る

Researchmap個人ページ

研究キーワード

  • 潜熱蓄熱
  • 蓄熱
  • 調湿
  • PCM
  • アンモニア
  • 稚内層珪藻頁岩
  • 潜熱蓄熱材
  • トリメチルアミン
  • 空気浄化
  • 廃熱
  • 活性炭
  • 硝酸マンガン・6水和物
  • エネルギー回収
  • 省エネルギー
  • VOC
  • 床吹き出し空調
  • DSC
  • 水蒸気吸放湿
  • 硫化アリル
  • ジメチルジスルフィド
  • 床冷房
  • 躯体蓄熱
  • 吸放湿
  • 消化
  • 調理臭気
  • ヒートポンプ
  • ガス吸着
  • ハニカムフィルター
  • アンケート調査
  • CO_2

研究分野

  • 社会基盤(土木・建築・防災), 建築環境、建築設備
  • 環境・農学, 環境材料、リサイクル技術
  • 環境・農学, 環境負荷低減技術、保全修復技術
  • ナノテク・材料, エネルギー化学
  • ライフサイエンス, 応用人類学

■経歴

経歴

  • 2006年 - 現在
    北海道大学, 工学院研究科, 教授

学歴

  • 1984年04月 - 1986年03月, 北海道大学 大学院, 工学研究科修士課程

委員歴

  • 2019年 - 現在
    NEDO「再生可能エネルギー熱利 用にかかるコスト技術開発, 評価委員長
  • 2017年07月 - 現在
    ハルビン工業大学, 客員教授, その他
  • 2006年 - 現在
    一般財団法人ヒートポンプ・蓄熱センター, 主査, 委員
  • 2019年04月 - 2021年03月
    公益社団法人 空気調和・衛生工学会, 北海道支部長
  • 2012年 - 2018年
    ニセコ町, 環境エネルギー戦略的アドバイザー
  • 2014年04月 - 2016年03月
    北海道大学, 総長補佐, 学協会
  • 2015年04月
    (公社)日本冷凍空調学会, 代表幹事, 学協会
  • 2015年04月
    (公社)空気調和・衛生工学会, 北海道支部長, 学協会
  • 2010年 - 2015年
    (独)土木研究所, 土木研究所外部評価委員会委員, 学協会
  • 2013年04月 - 2014年03月
    北海道大学, 役員補佐, 学協会
  • 2013年04月
    青森県地中熱利用普及研究会, 委員長, 学協会
  • 2009年04月 - 2010年03月
    (一社)日本太陽エネルギー学会, 理事, 学協会
  • 北海道次世代北方型居住空間モデル構想推進協議会, 委員, 学協会

学内役職歴

  • 総長補佐, 2014年4月1日 - 2015年3月31日
  • 総長補佐, 2015年4月1日 - 2017年3月31日
  • 役員補佐, 2013年4月1日 - 2014年3月31日

■研究活動情報

受賞

  • 2021年, 一般社団法人 建築設備技術者協会, カーボンニュートラル賞               
    長野 克則
  • 2018年, 公益社団法人 日本建築衛生管理教育センター, 平成29年度会長表彰(建築物の環境衛生管理事業功労者)               
    長野 克則
  • 2017年, 一般財団法人ヒートポンプ・蓄熱センター, 一般財団法人ヒートポンプ・蓄熱センター理事長賞               
    北海道大学, 留寿都村
  • 2016年, 経済産業省北海道経済産業局, 平成28年度省エネルギー・新エネルギー優良事業者等北海道経済産業局長表彰               
    長野 克則
  • 2015年, China Award for Sience and Technology in Construction, 「華夏建設科学技術賞」二等奨               
    長野 克則
  • 2015年, The 13rd International Conference on Thermal Energy Storage(Beijing), Best Paper Award               
    長野克則
  • 2012年, The 2nd International Energy Storage Conference(Dublin), Best Paper Award               
    長野克則
  • 2011年, (公社)空気調和・衛生工学会, 振興賞技術振興賞               
    長野克則
  • 2011年, (公社)日本地下水学会, 学術賞               
    長野克則
  • 2010年, (公社)空気調和・衛生工学会, 論文賞               
    長野克則
  • 2010年, (公社)空気調和・衛生工学会, 振興賞住宅環境設備賞               
    長野克則
  • 2010年, 産学官連携, 産学官連携功労者表彰(環境大臣賞)               
    「小水量対応高効率地中熱利用ヒートポンプシステムの開発」
    長野克則
  • 2009年, (一社)日本太陽エネルギー学会, 論文賞(押田賞)               
    長野克則
  • 2008年, The 9th IEA Heat Pump Conference(Zurich), Best Paper Award               
    長野克則
  • 2008年, (公社)空気調和・衛生工学会, 振興賞住宅環境設備賞               
    長野克則
  • 2006年, (一社)日本太陽エネルギー学会, 論文賞               
    長野克則
  • 2003年, The 9th International on Thermal Energy Storage(Warsaw), Best Paper Award               
    長野克則

論文

  • Analyzing the Performance of Double Spiral Tube Ground Heat Exchangers in a Zero-Energy Building Using Measurement Data
    Kunning Yang, Takao Katsura, Shigeyuki Nagasaka, Katsunori Nagano
    Energies, 16, 19, 2023年10月
    研究論文(学術雑誌), A ground-source heat pump (GSHP) system is a renewable energy technology that effectively reduces greenhouse gas emissions and consequently mitigates the progression of global warming. The thermal efficiency of ground heat exchangers (GHEs) is a critical component in the GSHP system that must be accurately estimated for its long-term operationality. Therefore, in this study, the thermal performance of double-spiral GHEs incorporated within the thermal piles of a zero-energy building in Sapporo, Japan, was investigated using the actual measured data obtained from the site and a novel metric, namely, the coefficient of heat extraction/injection, for a more precise evaluation. Moreover, this study assessed the coefficient of performance (COP) of the GSHP units during various periods of cooling or heating. The temperature of the circulating fluid remained within an ideal operational range over an operational period of 2 years, and the COP calculations indicated a high operational efficiency. The results derived in this study substantially exceeded those of traditional U-tube GHEs, indicating the enhanced efficiency and superior performance of large-diameter thermal piles with augmented thermal capacity. Our findings suggest that GSHP systems with double-spiral-tube GHEs have superior efficiency than conventional GHEs.
  • Performance prediction of an adsorption chiller combined with heat recovery and mass recovery by a three-dimensional model
    Fang He, Katsunori Nagano, Junya Togawa
    Energy, 277, 2023年08月15日
    研究論文(学術雑誌), In this study, a three-dimensional model was formulated to predict and analyze the performance of an adsorption chiller (AC) with heat recovery (HR) and mass recovery (MR). A new value factor index (VF) was proposed to determine the parameters for optimal system performance. This model was confirmed to be suitable for performance prediction. The coefficient of performance (COP) can be improved from 0.503 to 0.604 at a cycle period of 14 min, which is consistent with the results of our previous study. Based on the VF, an optimal HR period of 24 min was determined. Subsequently, MR was introduced. In cases where an MR of 1 s was utilized, the specific cooling power (SCP) increased from 0.389 kW/kg to 0.393 kW/kg, while the COP increased to 0.607 with the HR. In addition, as the mass recovery period lengthened, the COP decreased. The accumulated recoverable sensible heat was discovered to be shared by the HR and MR. The HR reduces the accumulated regeneration heat. MR not only reduced the regeneration heat but also enhanced the sorption process.
  • Development and application of a new calculation method for double spiral ground heat exchangers
    Kunning Yang, Takao Katsura, Shigeyuki Nagasaka, Katsunori Nagano
    Energy and Buildings, 291, 2023年07月15日
    研究論文(学術雑誌), This study provides a new calculation method for double spiral pipe ground heat exchangers (GHEs) and involves the combination of the analytical, infinite line source (ILS), and infinite cylindrical source (ICS) models with the capacity resistance model (CaRM). Method adopts the concept of fin efficiency, enabling it to calculate underground temperature changes easily and accurately, followed by integration into a simulation tool for ground source heat pump (GSHP) systems. Verification was done by comparing simulation results with actual operating data, measured from a zero-energy building (ZEB) in Sapporo, Japan. Analyses conducted using the new calculation method prove that simulation results can be obtained with increased precision and validity. Under conditions of instantaneous large heat injection, significant differences were observed between the simulation and the actual measurements during the initial 50 h. The number of temperature nodes in the network was increased to effectively reduce the error between simulations and measurements. Moreover, it was seen that the efficiency of double spiral pipe GHEs can be potentially improved by shortening the spiral pitch. This study thus confirms that the proposed new calculation method can be applied to future designs of GSHP systems by using thermal piles with double spiral pipe GHEs.
  • Field studies on the energy consumption and thermal comfort of a nZEB using radiant ceiling panel and open-loop groundwater heat pump system in a cold region
    Minzhi Ye, Katsunori Nagano, Ahmed A. Serageldin, Hideki Sato
    Journal of Building Engineering, 67, 2023年05月15日
    研究論文(学術雑誌), Field studies were conducted in an office building in a cold region equipped with a radiant ceiling panel (RCP) and open-loop groundwater heat pump (GWHP) system. First, the indoor thermal comfort in a target office was evaluated based on the results obtained from the physical measurements and survey questionnaire. The results showed that the suspended RCP system could achieve comfortable indoor thermal conditions throughout the year. The indoor temperature was maintained within the range of 22–26 °C, the humidity was within 30–60%, and CO2 concentration was mostly below 1000 ppm. Second, the energy performance was tested simultaneously, and intermittent and continuous operation methods were compared. Under the continuous operation method, a stable indoor environment was maintained, and the COP of the GWHP system increased by 10%. The results showed the potential to further reduce energy consumption and maintain a high level of thermal comfort through the optimization of system operations. Finally, the annual energy consumption was calculated based on the recorded measurements. The results illustrate that this building can reach the ZEB-ready level in Japan. The primary energy consumption can be decreased by approximately 67% compared to the reference by applying the combined system.
  • Experimental analysis of vacuum pressure and gas flow rate in structured-core transparent vacuum insulation panels
    Takao Katsura, Takato Miyata, Saim Memon, Ali Radwan, Katsunori Nagano
    ENERGY REPORTS, 9, 1071, 1078, ELSEVIER, 2023年03月
    英語, 研究論文(学術雑誌), The notion that modern buildings should strive to be net-zero energy buildings (NZEBs) is widely accepted. One of the causes leading to high energy usage for space heating, resulting in avoidable carbon emissions, is heat loss via building windows. In order to improve window's insulation in existing buildings, structured-core transparent vacuum insulation panels (TVIPs) are proposed. TVIPs mainly consist of the structured core material, the low-emissivity film, and the transparent gas barrier envelope. TVIPs have high insulation performance and are inexpensive to manufacture and can be easily installed. Therefore, TVIPs have the potential to improve window's insulation in existing buildings at a low cost. However, it is necessary to overcome the issue of preventing the pressure rise inside TVIP after vacuum sealing. The authors constructed an experimental setup to quantify the effect of reduction of gas flow rate in TVIP after evacuation by applying the pressure-rate-of-rise-method. In this experiment, a gas barrier film with a straw was used as the vacuum chamber. This could reproduce the pressure increase in the TVIP after sealing and the gas flow rate in the TVIP is evaluated. The experimental result shows that the coated core material and the enclosing getter agent lowered the pressure rise and gas flow rate in TVIP by combining concurrent evacuation and heating. Furthermore, after extending the simultaneous vacuuming and heating period to 8 h and applying the coated core material, and enclosing the getter agent, the internal pressure in TVIP may be lowered to around 1 Pa after 30 min after halting vacuuming. It was confirmed that this pressure satisfied the performance required for TVIPs, and the result was much closer to the realization of TVIPs. (c) 2022 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
  • Numerical and Parametric Study on Open-Type Ceiling Radiant Cooling Panel with Curved and Segmented Structure
    Minzhi Ye, Ahmed A. Serageldin, Katsunori Nagano
    ENERGIES, 16, 6, MDPI, 2023年03月
    英語, 研究論文(学術雑誌), A suspended open-type ceiling radiant cooling panel (CRCP) has been proposed recently. The main challenge is improving its cooling performance to overcome limitations for extensive use. Therefore, this study aims to optimize the design of CRCPs with curved and segmented structure to enhance heat transfer. A three-dimensional CFD model was developed to investigate the cooling capacity and heat transfer coefficient of the CRCPs installed inside a single enclosed room. Panel structure was determined based on four dependent parameters: the panel curvature width (L, m), the panel curvature radius (r, m), the void distance (d, m) between each panel or panel segment, and the panel coverage area (A(c), m(2)). The panel surface area (A(s), m(2)) and the ratio of panel curvature width to radius (L/r) were also examined. A total of 35 designs were compared under 7 different cooling load conditions, and 245 cases were carried out. The results show that the nominal cooling capacity and heat transfer coefficient rise with increasing curvature radius and decreasing curvature width. The void distance plays the most crucial role in influencing cooling performance. It is possible to simultaneously improve cooling performance, achieve uniform temperature distribution, and reduce the number of panels through structure optimization.
  • Evaluating Long-Term Performance of a Residential Ground-Source Heat Pump System under Climate Change in Cold and Warm Cities of Japan
    Yoshitaka Sakata, Yuma Akeyama, Takao Katsura, Katsunori Nagano
    Energies, 16, 6, 2742, MDPI, 2023年03月, [査読有り]
    英語, 研究論文(学術雑誌), A residential ground-source heat pump system often requires a long payback time to recover the capital cost. Long-term uncertainty in such a system's performance increases as the climate changes. This study compares 20-years hourly heating/cooling demands of a typical residence in the present (2000-2020) and in the future (2076-2095) for two locations in Japan. This study also calculated soil temperatures as heat sources through 1D heat-transfer simulation based on the A1B climate scenario in the Intergovernmental Panel on Climate Change's Special Report. System performance and simple payback times were compared in one cold and one warm city in Japan (Sapporo and Tokyo, respectively). Soil temperatures at a middle depth of a borehole heat exchanger were predicted to increase in the future by similar to 1 degrees C, with insignificant effects on a borehole heat exchanger. Seasonal performance factors increased in Sapporo because thermal demands would be kept even in the future, but decreased in Tokyo, which has a higher ratio of the energy used in operating the system in cooling mode compared with its small heating demand. The simple payback time was estimated at 16.2 and >20 years in Sapporo and Tokyo, respectively, both in the present and future, with the constant energy prices. If oil and gas prices doubled, the payback time would be halved in Sapporo to 8.4 years but remain around 20 years or more in Tokyo.
  • Field Study on Indoor Thermal Comfort of a ‘ZEB Ready’ Office Building Using Radiant Ceiling Panel Coupled with Open-Loop Ground Source Heat Pump
    Minzhi Ye, Ahmed A. Serageldin, Hideki Sato, Katsunori Nagano
    Environmental Science and Engineering, 2353, 2362, 2023年
    研究論文(国際会議プロシーディングス), A field study was conducted in a ‘ZEB ready’ office building using the radiant ceiling panel and open-loop ground source heat pump system in the cold region. The indoor thermal environment was evaluated based on the objective physical measurement and subjective questionnaire survey. Moreover, the energy consumption was calculated based on the record from the building energy management system. The system performances of intermittent and continuous operation methods were also compared in winter. The results show that the systems can achieve the required thermal comfort during the heating and cooling period, the indoor temperature is within 23–25 °C. More than 70% of staff declared ‘neutral’ in thermal sensation votes, which means most people were satisfied with the indoor thermal condition. Continuous operation leads to 19 kWh electric energy consumption per day more than intermittent operation, whereas the COP of the heat pump increases from 3.86 to 4.18.
  • Improvement of accuracy with uncertainty quantification in the simulation of a ground heat exchanger by combining model prediction and observation
    Yutaka Shoji, Takao Katsura, Katsunori Nagano
    GEOTHERMICS, 107, PERGAMON-ELSEVIER SCIENCE LTD, 2023年01月
    英語, 研究論文(学術雑誌), With the utilization of shallow geothermal heat as a renewable energy source in recent times, several studies have focused on ground heat exchanger simulation. Ground heat exchanger simulation is an important factor that contributes to the design and control of shallow geothermal systems. Thus far, various models and parameter estimation methods have been proposed to represent actual phenomena; however, errors inevitably occur be-tween the model predictions and actual values. Hence, a method that can explicitly account for this uncertainty is desirable. Thus, in this study, we show that data assimilation-a method that combines simulation and obser-vation for more accurate state estimation and uncertainty quantification-can be applied to ground heat exchanger simulation. To this end, we perform an in situ transient heating experiment using a single-borehole heat exchanger, and we assimilate the actual observations using an ensemble Kalman filter for a reproductive simulation. The results of the data assimilation experiment indicate that the model parameter, i.e., the soil effective thermal conductivity, is modified from 1.19 W m-1 K-1 estimated from the geologic column to 1.70 +/- 0.05 W m-1 K-1, and it reproduces the standard estimate of 1.69 W m-1 K-1 from the thermal response test. Further, for the ground heat exchanger inlet/outlet temperature, simulation without data assimilation yielded a maximum error of approximately 2.0 K, whereas simulation with data assimilation produced a highly accurate state estimate with a standard deviation of 0.08 K. The proposed method allows a posteriori estimation of soil properties from the operational data of ground heat exchanger systems installed without thermal response tests as well as the correction of deviations between the model and observation values through statistical support and uncertainty quantification.
  • Hybrid ground source heat pump system capable of year-round heating and its application in liquid natural gas vaporization
    Takao Katsura, Yutaka Shoji, Kunning Yang, Hitoshi Akai, Jun Shishido, Mitsuhiro Ishikawa, Yuichi Yashima, Koji Tanifuji, Katsunori Nagano
    INTERNATIONAL JOURNAL OF ENERGY RESEARCH, 46, 15, 23388, 23406, WILEY-HINDAWI, 2022年12月
    英語, 研究論文(学術雑誌), One of the challenges in using a ground source heat pump (GSHP) system is the long-term increase or decrease in underground temperature due to an imbalance between heat extraction and injection. To eliminate this imbalance, we proposed a hybrid GSHP (HGSHP) system combined with air-water heat exchangers (AWHEs) capable of year-round heating and applied it to the hot water supply for liquid natural gas (LNG) vaporization in a satellite station. In this paper, the authors demonstrate the year-round heating capability of the HGSHP system and the energy conservation benefits of installing the HGSHP system for LNG vaporization. First, a field experimental apparatus was constructed for a gas vaporization system with the HGSHP; thereafter, an experimental proof of gas vaporization was obtained. The experimental results showed that it was possible to stably vaporize liquid nitrogen that was used instead of LNG by supplying hot water at 25 degrees C. Additionally, in the gas vaporization experiment with the HGSHP system in the summer season, the SCOP measured was over ten. A calculation model for the AWHE was then established using the field test data; thereafter, a simulation tool for the HGSHP system was developed by combining it with one for the GSHP system. The simulation results indicated that the average surface temperature of all GHEs in the HGSHP system decreases from first year to second year. However, the average surface temperature of all GHEs stabilizes at a reduced level after the third year. These results indicate that the HGSHP system can operate long-term for year-round heating because the average surface temperature stabilize in the long-term.
  • An inverter-driven heat pump with a multi-tubular tube-in-tube heat exchanger for domestic hot water supply
    Hongzhi Liu, Takao Katsura, Katsunori Nagano
    JOURNAL OF BUILDING ENGINEERING, 54, ELSEVIER, 2022年08月
    英語, 研究論文(学術雑誌), An inverter-driven heat pump prototype to supply domestic hot water (DHW) was built, within which a multi-tubular tube-in-tube counter-flow heat exchanger as condenser was installed including a desuperheater section and a condenser section. The heating coefficient of performance (COP) is reduced approximately 10% if the feed water temperature increases from 9 degrees C to 24 degrees C. When the inlet temperature of primary brine is 24 degrees C, the compressor frequency does not show any effect on the heating COP. While when the inlet temperatures of primary fluid are 5, 10, and 17 degrees C, the COP increases with the rise of the compressor frequency at first, but it stays almost constant when the compressor frequency is within 40-55 Hz. It is considered that the effects of opposite dependencies of heat transfer and the pressure drop in the condenser onto COP tend to cancel each other out to obtain a constant heating COP. When the produced hot water is 65 degrees C, the heating COP of our developed heat pump for DHW is the largest among those of other three different heat pumps.
  • MICS-ANN model: An artificial neural network model for fast computation of G-function in moving infinite cylindrical source model
    Yutaka Shoji, Takao Katsura, Katsunori Nagano
    GEOTHERMICS, 100, PERGAMON-ELSEVIER SCIENCE LTD, 2022年03月
    英語, 研究論文(学術雑誌), Model of the temperature field around the ground heat exchanger is a critical part of shallow geothermal system simulation. Some models have not yet obtained an analytical solution due to the presence of groundwater flow or the complex geometry of the ground heat exchanger. For such models, numerical analysis is performed and the computational cost is an issue. Here we show a method to reproduce the finite volume method solution of the moving infinite cylindrical source model quickly and accurately using an artificial neural network. Using the obtained artificial neural network model, the hourly 20-year temperature response function of the moving infinite cylindrical source model can be computed in only 5.726 s. The mean squared error of the artificial neural network model for the finite volume method solution was 2.158 x 10(-6) in dimensionless temperature, indicating a sufficiently small error. The fast and accurate calculation of the moving infinite cylindrical source model is expected to contribute to the optimal design of shallow geothermal systems with a groundwater flow field. In addition, this method of reproducing a temperature response function by artificial neural network may be applicable not only to the moving infinite cylindrical source model but also to other models.
  • 地中熱オープンループシステムにおける井戸性能評価に関する研究(その4)札幌三建ビルにおける還元井目詰まり要因に関する実験的考察
    阪田 義隆, 長野 克則, 沖原 峻, 佐藤 英樹
    技術統括本部技術報告 = EMD research activity reports / 三建設備工業(株)技術統括本部 編, 29, 15, 22, 三建設備工業技術統括本部, 2022年
    日本語
  • 凹型天井放射パネルの冷暖房時の放熱性能と室内垂直温度分布に関する実験的研究
    長野 克則, 叶 敏之, 佐藤 英樹
    技術統括本部技術報告 = EMD research activity reports / 三建設備工業(株)技術統括本部 編, 29, 37, 40, 三建設備工業技術統括本部, 2022年
    日本語
  • Thermal performance improvement of AHP using corrugated heat exchanger by dip-coating method with mass recovery
    Fang He, Katsunori Nagano, Sung-Hoon Seol, Junya Togawa
    ENERGY, 239, PERGAMON-ELSEVIER SCIENCE LTD, 2022年01月
    英語, 研究論文(学術雑誌), This study focuses on the adsorption heat pump cooling performance enhancement. The corrugated heat exchanger (HEX) has been employed in recent years owing to its excellent heat transfer; however, its filling method require improvement. Therefore, a filling method called dip-coating method is introduced to improve its heat transfer and packing density. The dip-coating method is adapted to accommodate the Wakkanai siliceous shale composite adsorbent, and two types of adsorbent filled-HEX (ad-HEX), i.e., the dip-HEX and dip-filled-HEX, are compared with the conventional ad-HEX of the filled-HEX. The dip-HEX comprises a few mass transfer channels and has a packing density similar to that of the filled-HEX. Meanwhile, the dip-filled-HEX exhibits a 30% higher packing density compared with the filled-HEX. A basic performance experiment is performed, and the results indicate that the dip-HEX outperforms the filled-HEX owing to its higher coefficient of performance (COP) and specific cooling power (SCP). The dip-filled-HEX exhibits a slightly lower SCP than the filled-HEX; however, it exhibits the highest COP among three types of ad-HEXs. Subsequently, mass recovery is applied to enhance the cooling performance. In a typical mass recovery period of 10 s, the COP and SCP of the dip-HEX increases to 0.46 and 0.74 W/g, respectively. (C) 2021 Elsevier Ltd. All rights reserved.
  • Numerical investigation of the thermal performance of a radiant ceiling cooling panel with segmented concave surfaces
    Ahmed A. Serageldin, Minzhi Ye, Ali Radwan, Hideki Sato, Katsunori Nagano
    JOURNAL OF BUILDING ENGINEERING, 42, ELSEVIER, 2021年10月
    英語, 研究論文(学術雑誌), Radiant cooling/heating (RCH) panel systems have recently received increasing attention because of their energy-efficient operation and improved comfort performance. Therefore, this study proposes a novel RCH panel with segmented concave surfaces. The new panel has the same surface area as a conventional flat surface panel. A series of laboratory tests were conducted to investigate the heat transfer characteristics inside a chamber equipped with the new panel. Moreover, a three-dimensional finite volume simulation was developed to investigate the heat transfer, fluid flow, and thermal comfort conditions inside a single room equipped with the proposed panel, and the results were compared with those of a conventional flat surface panel under the same operating conditions and cooling load. First, the curvature cord length ratio to curvature radius (L/R) was optimized in the range of 0 (flat) to 2. In all cases, the surface area was the same, but the coverage area ratio varied. In addition, the impact of different coverage area ratios from 55% to 81% and the influence of adding void spaces of 29 mm and 11 mm between adjacent curved segments were analyzed. The results showed that the simulation achieved good agreement with the experimental results with an accuracy of 98.9%. The coverage area ratio played an essential role in decreasing the indoor air temperature by 2 degrees C and reducing the floor temperature by 1.6 degrees C. When the L/R ratio changed from 0 to 1.5 at a coverage ratio of 81%, the average air temperature decreased by 1 degrees C. Moreover, increasing the L/R ratio from 0 to 2 with void spaces of 2.9 mm and 11 mm reduced the radiation heat transfer coefficient, h(r), by 31%, while the convection heat transfer coefficient, h(c), at the panel upper surface increased by 174%. Changing only the panel surface shape from flat to concave and segmented enhanced the thermal performance and thermal comfort inside the indoor environment.
  • The thermal potential of a new multifunctional sliding window
    Mostafa M.S. Ahmed, Ali Radwan, Ahmed A. Serageldin, Ahmed Abdeen, Essam M. Abo-Zahhad, Katsunori Nagano
    Solar Energy, 226, 389, 407, Elsevier Ltd, 2021年09月15日
    英語, 研究論文(学術雑誌), Nowadays, new generations of building envelope need to manage the energy exchange between outdoor and indoor environment responsively and save the building energy. A significant amount of solar heat gain in buildings comes through the windows. The transparent envelope also must answer to visual requirements allowing for external vision but guarantying comfort conditions. In this framework, this article aims to test numerically the thermal performance of a new design of multifunctional glazed window combining the most recent technologies used in building envelopes. Five distinct window designs combing phase change material (PCM), vacuum glazing (VG), photovoltaic (PV), and air cavity were numerically tested for hot weather conditions. The proposed window designs slide inside the wall of the building. A comprehensive transient Multiphysics model coupling the thermo-electric model of the PV, melting and solidification model of the PCM, and the heat transfer mechanisms in the vacuum and air gaps are developed. The model is step by step validated with data in the literature. Various PCM types and PCM thickness are investigated. Among the five investigated window designs, the result showed that the window, including the air gap with PV, PCM cavity, and VG, is the optimal design for the indoor air's thermal isolation. Simultaneously, the PCM with a melting point of 35 ˚C and thickness of 50 mm is the best performance material in a hot arid region in summer at Cairo. The proposed multifunction window generated maximum electrical power intensity of 162 W/m2 at received solar radiation of 1000 W/m2.
  • Thermal performance of ceiling radiant cooling panel with a segmented and concave surface: Laboratory analysis
    Minzhi Ye, Ahmed A. Serageldin, Ali Radwan, Hideki Sato, Katsunori Nagano
    APPLIED THERMAL ENGINEERING, 196, PERGAMON-ELSEVIER SCIENCE LTD, 2021年09月
    英語, 研究論文(学術雑誌), Radiant heating/cooling systems are thermally efficient and economically feasible alternatives to conventional ventilated air conditioning. This study experimentally investigates the thermal performance of the ceiling radiant cooling panel (CRCP) with a segmented and concave surface by evaluating the thermal conditions inside a laboratory-scale room equipped with this new panel. The experiments were carried out under various operating conditions, where the fluid inlet temperature and fluid flow rate were controlled independently. The indoor air temperature, air velocity, and humidity ratio were recorded and analyzed, and the temperatures of the upper and lower panel surfaces and the surrounding surfaces were also measured. Subsequently, the heat transfer properties were calculated and summarized. When the inlet water temperature decreased from 24 degrees C to 15 degrees C at the same flow rate of 4 L/min, the average air temperature decreased by over 1.5 degrees C, and the total heat flux increased by 50%. The heat flux changed significantly with variations in the inlet water temperature, while changing the flow rate had a smaller impact. The radiant heat transfer coefficient of the panel was determined to be 5.0 W/(m2.K), while the convective heat transfer coefficient exhibited an exponential relationship with the temperature difference between the surface of the panel and the surrounding air. Moreover, the proposed panel enhanced the convective heat flux by 2.6 times and the total heat flux by 45%, compared with a flat panel, and achieve the same improvement as the panel with inclined fins, but with a smaller surface area. In addition, the panel achieved the same air temperature with a lower flow rate, which shows the potential for energy saving.
  • Life cycle cost analysis of ground source heat pump system based on multilayer thermal response test
    Hobyung Chae, Katsunori Nagano, Takao Katsura, Yoshitaka Sakata, Ahmed A. Serageldin
    Energy and Building, 261, 111427, ELSEVIER SCIENCE SA, 2021年09月, [査読有り]
    英語, 研究論文(学術雑誌), The purpose of this study was to determine the life cycle cost (LCC) of a ground source heat pump (GSHP) system based on the results of a multilayer thermal response test (TRT). Previous studies by our research team suggested the possibility of significantly reducing the total borehole length, based on the results of the multilayer TRT to identify the partial groundwater flow. In the present study, it was validated that the borehole heat exchangers reduced by the results of the partial groundwater flow could operate with a sustainable performance of the GSHP system over an extended period. LCCs of the GSHP system for 30 years were analyzed in three areas with different climatic and geological conditions. Based on these results, the proposed method demonstrates a reasonable cost reduction advantage compared with conventional TRT analysis. The multilayer TRT analysis was validated using root mean square error and temperature error, obtained from temperature comparison between the numerical simulation results and the TRT data. The required total borehole length was achieved when the performance of the GSHP system attained the target performance for heating, after 30 years of operation. The GSHP system, designed by considering the partial groundwater flow, can reduce 30-40% of the total borehole length and 15-20% of the LCC, compared with the system designed based on conventional TRT analysis.(c) 2021 Elsevier B.V. All rights reserved.
  • Evaluating Groundwater Flow Effects for Enhancement of Ground-Source Heat Pipes in the Case of the Toyohira River Alluvial Fan, Japan               
    Yoshikata Sakata, Johnson Chishimba, Masataka Mochizuki, Katsunori Nagano
    Hydrology, 8, 3, 135, 2021年09月, [査読有り]
  • Design and thermal analysis of a new multi-segmented mini channel based radiant ceiling cooling panel
    Ali Radwan, Takao Katsura, Lan Ding, Ahmed A. Serageldin, Ahmed I. EL-Seesy, Katsunori Nagano
    Journal of Building Engineering, 40, 102330, 102330, Elsevier BV, 2021年08月
    研究論文(学術雑誌)
  • Numerical optimization of a novel ceiling radiant cooling panel combined with wall attached ventilation system               
    Minzhi Ye, Ahmed A. Serageldin, Katsunori Nagano
    Case Studies in Thermal Engineering, 26, 101066, 2021年08月, [査読有り]
  • Parametric analysis, response surface, sensitivity analysis, and optimization of a novel spiral-double ground heat exchanger               
    Ahmed A. Serageld, Ali Radwan, Takao Katsura, Yoshitaka Sakata, Shigeyuki Nagansaka, Nagano Katsunori
    Energy Conversion and Management, 240, 114251, 2021年07月, [査読有り]
  • Nationwide determination of required total lengths of multiple borehole heat exchangers under variable climate and geology in Japan
    Yoshitaka Sakata, Takao Katsura, Katsunori Nagano
    International Journal of Geo-information, 10, 4, 205, 205, 2021年04月, [査読有り]
    研究論文(学術雑誌)
  • 地中熱の利活用最前線 地盤情報を利用した設計・性能予測ツール・ポテンシャル評価システムの開発
    長野克則
    伝熱, 60, 251, 13, 18, 日本伝熱学会, 2021年04月, [査読有り], [筆頭著者]
    日本語
  • Evaluating variability of ground thermal conductivity within a steep site by history matching underground distributed temperatures from thermal response tests
    Yoshitaka Sakata,Takao Katsura, Ahmed A. Serageldin, Katsunori Nagano, Motoaki Ooe
    Energies, 14, 7, 1872, 1872, MDPI AG, 2021年03月, [査読有り]
    研究論文(学術雑誌), The variability of ground thermal conductivity, based on underground conditions, is often ignored during the design of ground-source heat pump systems. This study shows a field evidence of such site-scale variations through thermal response tests in eight borehole heat exchangers aligned at a site on a terrace along the foothills of mountains in northern Japan. Conventional analysis of the overall ground thermal conductivity along the total installation length finds that the value at one borehole heat exchanger is 2.5 times that at the other seven boreholes. History matching analysis of underground distributed temperature measurements generates vertical partial ground thermal conductivity data for four depth layers. Based on the moving line heat source theory, the partial values are generally within a narrow range expected for gravel deposits. Darcy velocities of groundwater are estimated to be 74–204 m/y at the borehole with high conductivity, increasing in the shallow layers above a depth of 41 m. In contrast, the velocities at the other seven boreholes are one-to-two orders of magnitude smaller with no trend. These high and low velocity values are considered for the topography and permeability. However, the relatively slow groundwater velocities might not apparently increase the partial conductivity.
  • Development of a new vacuum-based photovoltaic/thermal collector, and its thermal and exergy analyses
    Ali Radwan, Takao Katsura, Saim Memon, Essam M. Abo-Zahhad, O. Abdelrehim, Ahmed A. Serageldin, Mohamed R. Elmarghany, Asmaa Khater, Katsunori Nagano
    Sustainable Energy and Fuels, 4, 12, 6251, 6273, 2020年12月, [査読有り]
    研究論文(学術雑誌), Photovoltaic-thermal (PV/T) solar collectors convert solar radiation into electrical power and heat. Part of received solar energy can be lost to the atmosphere from the top surface of the PV/T module, especially in windy regions. Thus, in this study, a new vacuum-based photovoltaic thermal (VPV/T) collector is designed and comparatively analyzed with the conventional PV/T collector. The new design differs from the conventional PV/T design by including a vacuum layer above the silicon wafer. Besides, to enhance the heat dissipation from the silicon wafer in the VPV/T design to the thermal absorber, the thicknesses of ethylene-vinyl acetate and tedlar polyester tedlar layers underneath the silicon wafer are decreased. A comprehensive 3D conjugate thermal model is developed and validated. The comparison is conducted under steady and transient conditions. The effects of Reynolds number (Re), wind speed, glass emissivity, and vacuum pressure are investigated. And finally, exergy analysis results for both designs are compared. The results showed that the new VPV/T collector has accomplished a 26.6% increase in the thermal power without changing the electrical power gain at Re of 50 and solar irradiance of 1000 W m-2. In addition, the vacuum pressure degradation from 0.01 Pa to 10 Pa slightly decreases the gained thermal power of the new VPV/T collector. A further increase in the vacuum pressure from 10 Pa to 1.013 × 105 Pa significantly decreases the gained thermal power with a slight increase in the electrical power. Furthermore, the total predicted VPV/T and the conventional PV/T exergy efficiency are 39.6% and 32%, respectively. This journal is
  • Analysis of a vacuum-based photovoltaic thermal collector
    Ali Radwan, Takao Katsura, Saim Memon, Essam M. Abo-Zahhad, Ahmed A. Serageldin, Katsunori Nagano
    Energy Reports, 6, 236, 242, 2020年12月, [査読有り]
    研究論文(学術雑誌), In this study, a new design of photovoltaic thermal (PV/T) collector is proposed. This design uses a vacuum layer above the silicon wafer and not exists in the traditional PV/T collector. This layer is used to decrease the heat loss from the top surface of the PV/T collector. The analysis is conducted using a 3D thermal modeling. The new collector design with the vacuum layer achieved a 26.6% increase in the thermal power while keeping the electrical the same at Reynolds number of 50 and solar radiation of 1000 W/m . In addition, the degradation of the vacuum pressure slightly influence the thermal performance while increasing the vacuum pressure from 0.01 Pa to 10 Pa. While further increase in the vacuum pressure from 10 Pa to 1.013×10 Pa substantially decreases the gained thermal power with insignificant increase in the electrical power. 2 5
  • Performance enhancement of borehole ground source heat pump using single U-tube heat exchanger with a novel oval cross-section (SUO) and a novel spacer
    Ahmed A. Serageldin, Yoshitaka Sakata, Takao Katsura, Katsunori Nagano
    Sustainable Energy Technologies and Assessments, 42, 100805, 2020年12月, [査読有り]
    研究論文(学術雑誌), This study introduces a new, efficient, and cost-effective spacer to maintain the space between the upward and downward U-tube legs of a single U-tube with an oval cross-section. Therefore, short-term and long-term transient numerical simulations were performed to compare the thermal and energy performance of the ground source heat pump system with both a single U-tube with an oval cross-section coupled with a novel spacer, and a conventional single U-tube with a circular cross-section. The impact of using different spacer cross-sections (circular cross-section, oval cross-section, and an oval cross-section with fins, double spacers with circular cross-section), materials, and length on the thermal performance was examined. Finally, a straightforward economic study was implemented to examine the feasibility of utilizing the proposed spacer. A single aluminum spacer with oval and fins cross-section decreases the borehole thermal resistance (R ) by 25 % and 28 % compared with single U-tube with an oval cross-section and single U-tube with a circular cross-section, respectively. Furthermore, it improves the coefficient of performance (COP) in winter by 9.5 % compared with single U-tube with circular cross-section. Thus, it saves 497 kW·h operating energy. Finally, the economic study shows that the simple payback period for using the single aluminum spacer with oval and fins cross-section of length 50 m is 3.8 y. b
  • Thermal performance analyses of a new multi-segmented minichannel-based radiant ceiling cooling panel
    Lan Ding, Takao Katsura, Ali Radwan, Katsunori Nagano
    Energy Reports, 6, 1409, 1415, 2020年12月, [査読有り]
    研究論文(学術雑誌), In this study, a new multi-segmented radiant ceiling panel with different tilt angle is proposed. The effect of segments inclination angle and panel area increase for the same coverage ratio are investigated. A 3-dimension computational fluid dynamics model is developed and validated for these comparisons. It is concluded that increasing segments angle decrease the ratio between the radiation and total heat exchange. In addition, using the multi-segments allows the air to move from the plenum area to the central zone of the room. Further, the operative temperature for the ±45° is minimum with best value for the predicted mean vote and lowest value of predicted percentage dissatisfied compared with ±30°, ±75° and 90°. And increasing the panel area with 300% increased the panel cooling capacity by around 140% for the same indoor temperature of 25.3±0.2°C and the same ceiling area. This research found that the cooling capacity is proportional to the area of the radiant panel, but under the same ceiling area, when the area ratio exceeds a certain value, the thermal performance will decrease due to the reduction of the convection heat transfer coefficient.
  • Simulation on annual performance of solar adsorption heat pump system using composite natural mesoporous material in different metrological conditions
    Sung Hoon Seol, Katsunori Nagano, Junya Togawa
    Renewable Energy, 162, 1587, 1604, 2020年12月, [査読有り]
    研究論文(学術雑誌), This paper presents research on the annual cooling performance of the solar adsorption heat pump (AHP), which applies a composite natural mesoporous material that is referred to as Wakkanai Siliceous Shale (WSS) as an adsorbent. One way to efficiently employ thermal energy is to reduce the sensible heat loss that occurs when changing the ad/desorption mode by extending the cycle time. The average temperature of the regeneration water for the half cycle time of 14 min was approximately 8.7 °C higher than that for the half cycle time of 8 min. In this case, the system with WSS + LiCl 20 wt% showed an increase in AHP cooling performance of approximately 15%. The higher adsorption capacity of the WSS composite enabled operation of the system with a longer cycle time. In terms of the annual operation of the AHP, although the achievable AHP cooling energy in Dubai was higher than that in Hawaii, much higher cost savings can be obtained in Hawaii than in Dubai because of the high electricity cost in Hawaii. The estimated payback periods in Hawaii and Dubai are 6.6 years and 15.6 years, respectively.
  • CFD simulation on the thermal performance of a novel radiant ceiling cooling panel (RCCP) system with segmented and concave surface combined with forced ventilation
    Minzhi Ye, Ahmed A. Serageldin, Katsunori Nagano
    ENERGY REPORTS, 6, 1519, 1524, ELSEVIER, 2020年12月, [査読有り]
    英語, 研究論文(学術雑誌), The radiant ceiling cooling panel (RCCP) system has been proved thermally efficient and economically but it cannot prevent hot air stream from window individually. Therefore, this study integrated a forced ventilation system with a new RCCP with a segmented and concave surface. In this study, a three-dimensional CFD model is developed and validated with the experimental results. Whereas, the indoor thermal comfort and cooling performance of the proposed coupling are numerically investigated, analyzed, and compared with the RCCP system with ventilation. The results show that the ventilation system is effective to prevent the hot air stream, and it also enhanced the cooling performance of the RCCP. Furthermore, the parametric study and sensitivity analysis are carried out to optimize the operating condition of these two systems to maximize the cooling capacity of the RCCP system and increases the panel surface temperature to mitigate the possible condensation. (C) 2020 The Authors. Published by Elsevier Ltd.
  • 地中熱利用における課題と地下水学からのアプローチ               
    阪田義隆, 長野克則
    地下水学会誌, 62, 4, 515, 524, 2020年12月, [査読有り]
    日本語
  • Erratum to “Method for calculation of ground temperature in scenarios involving multiple ground heat exchangers and groundwater advection” [Energy Build. 220 (2020) 110000] (Energy & Buildings (2020) 220, (S0378778819336564), (10.1016/j.enbuild.2020.110000))
    Takao Katsura, Yutaka Shoji, Yoshitaka Sakata, Katsunori Nagano
    Energy and Buildings, 227, Elsevier Ltd, 2020年11月15日
    英語, 研究論文(学術雑誌), The publisher regrets the following part was disappeared in the article published in Energy &
    Building, 220 (2020) 110000. <
    3.2. Experimental calculation In order to examine the calculation with the developed method, we conducted an experimental calculation of the underground temperature for the case with multiple GHEs and time-variable heat flux conditions. In this experimental calculation, we considered 8 GHEs, each of length 100 m. Fig. 11 shows the arrangement of the multiple GHEs. Table 3 indicates the soil properties considered for the experimental calculation. To compare the difference due to the groundwater flow existence, we conducted the calculation assuming the groundwater velocity conditions of 0 m year−1 and 100 m year−1. The hourly annual heat extractions shown in Fig. 12 were divided according to the number of GHEs, and the ground temperature was calculated by considering the divided values. The experimental calculation was conducted for 2 years (17,520 h). Fig. 13 shows the calculated hourly average temperature variation of the surfaces of the GHEs. The result for the case with groundwater flow demonstrates the restrained temperature variation compared to that without groundwater flow. With reference to the calculation speed, we used a popular laptop computer with a 2.8 GHz single core processor and 16 GB memory for the experimental calculation. The required calculation time of the experimental simulation with multiple GHEs and time-variable heat flux conditions was 94.0 s for the 2-year simulation period. Therefore, the results of the experimental calculation indicate that the calculation time can be significantly reduced by using the developed method compared to the numerical analysis. In addition, it is possible to use a simple interface, as shown in Fig. 14, if the developed calculation method is applied. In other words, we can input the conditions mentioned in this section without the need for a complex procedure. Also, it is easy to change the calculation conditions, such as the number of GHEs, their arrangement, groundwater advection velocity, and angle of groundwater flow.>
    The publisher would like to apologise for any inconvenience caused.
  • Estimation of ground thermal conductivity through indicator kriging: Nation-scale application and vertical profile analysis in Japan
    Yoshitaka Sakata, Takao Katsura, Katsunori Nagano
    Geothermics, 88, 101881, 101881, Elsevier BV, 2020年11月, [査読有り]
    研究論文(学術雑誌)
  • Experimental study and development of a low-cost 1 kW adsorption chiller using composite adsorbent based on natural mesoporous material
    Fang He, Katsunori Nagano, Junya Togawa
    Energy, 209, 118365, 2020年10月15日, [査読有り]
    研究論文(学術雑誌), This study aims to develop a low-cost and highly efficient adsorption chiller (AHP). A laboratory-scale AHP with a capacity of 1 kW and transparent body was developed to observe the valve's operation and condensed water. A natural mesoporous material, WSS impregnated with 20 wt % LiCl was used as an adsorbent to reduce the initial cost and filled into aluminum corrugated heat exchangers (HEX). Foundation performance experiments were conducted, and the COP of 0.45 and SCP of 0.41 kW/kg were obtained under the following experimental conditions: regeneration at 80 °C, condensation, and sorption at 30 °C, chilled water of 15 °C, and cycle time of 14 min. Further, heat recovery was introduced and experimentally studied to reduce the regeneration heat amount, and the heat balance for this AHP was evaluated. It was confirmed that two types of heat recoveries could improve the COP for this AHP up to 0.54 when the outlet temperature of both adsorbers was 55 °C. The COP could be further improved to 0.57, based on the calculation for the heat balance. This AHP has advantages of high SCP as compared with AHPs in other formal studies, although some details need to be studied in the future.
  • Thermal analysis of a new sliding smart window integrated with vacuum insulation, photovoltaic, and phase change material
    Mostafa Ahmed, Ali Radwan, Ahmed Serageldin, Saim Memon, Takao Katsura, Katsunori Nagano
    Sustainability (Switzerland), 12, 19, 7846, 2020年10月, [査読有り]
    研究論文(学術雑誌), A zero-energy building (ZEB) requires an innovative integration of technologies, in which windows play a paramount role in energy reduction, storage, and generation. This study contributes to four innovative designs of sliding smart windows. It integrates air-gap (AG), phase change material (PCM), photovoltaic (PV), and vacuum glazing (VG) technologies. These smart sliding windows are proposed to generate electricity along with achieving efficient thermal insulations and heat storage simultaneously. A two-dimensional multiphysics thermal model that couples the PCM melting and solidification model, PV model, natural convection in the cavity, and the surface-to-surface radiation model in the vacuum gap are developed for the first time. The model is validated with data in the literature. The transient simulations were carried out to investigate the thermo-electrical performance of a window with an area of 1 m by 1 m for the meteorological conditions of Kuwait city on the 10th of June 2018, where the window was oriented to south direction. The results showed that the total solar heat energy gain per unit window area is 2.6 kWh, 0.02 kWh, 0.22 kWh, 1.48 kWh, and 0.2 kWh for the double AG, AG + PV + PCM + VG, PV + PCM + VG, AG + PV + PCM, and the ventilated AG + PV + PCM + VG, respectively. The results elucidate the advantages of the integration of VG in this integrated sliding smart window. The daily generated PV electrical energy in these systems is around 1.3 kWh, 1.43 kWh, and 1.38 kWh for the base case with double AG, PV + PCM + VG, and the ventilated AG + PV + PCM + VG respectively per unit window area.
  • Development of simulation tool for ground source heat pump systems influenced by ground surface
    Takao Katsura, Yoshitaka Sakata, Lan Ding, Katsunori Nagano
    Energies, 13, 17, 4491, 2020年09月, [査読有り]
    研究論文(学術雑誌), The authors developed a ground heat exchanger (GHE) calculation model influenced by the ground surface by applying the superposition theorem. Furthermore, a simulation tool for ground source heat pump (GSHP) systems affected by ground surface was developed by combining the GHE calculation model with the simulation tool for GSHP systems that the authors previously developed. In this paper, the outlines of GHE calculation model is explained. Next, in order to validate the calculation precision of the tool, a thermal response test (TRT) was carried out using a borehole GHE with a length of 30 m and the outlet temperature of the GHE calculated using the tool was compared to the measured one. The relative error between the temperatures of the heat carrier fluid in the GHE obtained by measurement and calculation was 3.3% and this result indicated that the tool can reproduce the measurement with acceptable precision. In addition, the authors assumed that the GSHP system was installed in residential houses and predicted the performances of GSHP systems using the GHEs with different lengths and numbers, but the same total length. The result showed that the average surface temperature of GHE with a length of 10 m becomes approximately 2 C higher than the average surface temperature of a GHE with a length of 100 m in August. ◦
  • Erratum to “Method for calculation of ground temperature in scenarios involving multiple ground heat exchangers and groundwater advection” [Energy Build. 220 (2020) 110000]               
    Takao Katsura, Yutaka Shoji, Yoshitaka Sakata, Katsunori Nagano
    Energy and Buildings, 227, 110409, 2020年09月, [査読有り]
  • Experimental investigation on a vapor injection heat pump system with a single-stage compressor
    Hongzhi Liu, Katsunori Nagano, Takao Katsura, Yue Han
    Energies, 13, 12, 3133, 2020年06月, [査読有り]
    研究論文(学術雑誌), In this study, a heat pump of 10 kW with vapor injection using refrigerant of R410A was developed. A vapor injection pipe connecting a gas-liquid separator at the outlet of the main expansion valve and the suction of a single-stage rotary compressor was designed. The heating performance of this vapor injection heat pump was investigated and analyzed at different compressor frequencies and primary temperatures. The experimental results show that for the heat pump without vapor injection, the heating capacity increased linearly with the compressor frequency, while the heating coefficient of performance (COP) decreased linearly with the compressor frequency for each tested primary temperature. The developed vapor injection technique is able to increase the heat pump system's heating capacity and heating COP when the injection ratio R falls into the range 0.16-0.17. The refrigerant mass flow rate can be increased in the vapor injection heat pump cycle due to the decreased specific volume of the suction refrigerant. The power consumption of vapor injection heat pump cycle almost remains the same with that of the conventional heat pump cycle because of the increased refrigerant mass flow rate and the decreased compression ratio. Finally, it was found that the developed vapor injection cycle is preferable to decreasing the compressor's discharge temperature.
  • Analysis of relaxation time of temperature in thermal response test for design of borehole size               
    Hobyung Chae, Katsunori Nagano, Takao Katsura, Yoshitaka Sakata, Ahmed A. Serageldin, Takeshi Kondo
    Energies, 13, 13, 3297, 3297, 2020年06月, [査読有り]
  • Thermal and electrical performances of semi-transparent photovoltaic glazing integrated with translucent vacuum insulation panel and vacuum glazing               
    Ali Radwan, Takao Katsura, Saim Memon, Ahmed A. Serageldin, Makoto Nakamura, Katsunori Nagano
    Energy Conversion and Management, 215, 112920, 2020年05月, [査読有り]
  • Method for calculation of ground temperature in scenarios involving multiple ground heat exchangers and groundwater advection               
    Takao Katsura, Yutaka Shoji, Yoshitaka Sakata, Katsunori Nagano
    Energy & Buildings, 220, 110000, 110000, 2020年04月, [査読有り]
  • A New Simulation Model for Vertical Spiral Ground Heat Exchangers Combining Cylindrical Source Model and Capacity Resistance Model
    Takao Katsura, Takashi Higashitani, Yuzhi Fang, Yoshitaka Sakata, Katsunori Nagano, Hitoshi Akai, Motoaki OE
    Energies, 13, 6, 1339, 1339, MDPI AG, 2020年03月13日, [査読有り]
    英語, 研究論文(学術雑誌), Considering the heat capacity inside vertical spiral ground heat exchanger (VSGHEX) in the simulation is one of the most noteworthy challenge to design the ground source heat pump (GSHP) system with VSGHEXs. In this paper, a new simulation model for VSGHEXs is developed by combining the ICS model with the CaRM. The developed simulation model can consider the heat capacity inside VSGHEX and provide dynamic calculation with high speed and appropriate precision. In order to apply the CaRM, the equivalent length was introduced. Then, the equivalent length was approximated by comparing the results of the CaRM and the numerical calculation. In addition, the calculation model of the VSGHEX was integrated into the design and simulation tool for the GSHP system. The accuracy of the tool was verified by comparing with the measurements. The error between supply temperatures of the measurements and calculation is approximately 2 °C at the maximum. Finally, assuming GSHP systems with VSGHEXs, whose spiral diameter was 500 mm and depth was 4 m, were installed in residential houses in Japan, the required numbers of VSGHEXs were estimated. The results showed a strong correlation between the total heating or cooling load and the required number. Therefore, the required number can be estimated by using the simplified approximate equation.
  • Thermal performance analysis of a new structured-core translucent vacuum insulation panel in comparison to vacuum glazing: Experimental and theoretically validated analyses
    Takao Katsura, Saim Memon, Ali Radwan, Makoto Nakamura, Katsunori Nagano
    SOLAR ENERGY, 199, 326, 346, PERGAMON-ELSEVIER SCIENCE LTD, 2020年03月
    英語, 研究論文(学術雑誌), The notion at which, nowadays, building sector is being recognized to be nearly zero-energy buildings (NZEBs) relies partly on the thermal performance of its fabric insulation. Vacuum glazing (VG) technology attracted the research interest as an option to reduce heat loss through windows. However, the total glazing thermal transmittance (U-value) for VG increases with the use of smaller glazing area due to the edge-seal effects, due to the thermal short-circuit around the edges and the overall construction cost of VG leading to an unaffordable option to deal with energy conservation of buildings. Therefore, this study aims to propose a new structured core transparent vacuum insulation panel (TVIP) to accomplish insulation for the windows without edge sealing effect, with lower cost and can be easily retrofitted to the conventional windows of the existing buildings. To do this, VG and TVIP were constructed and their thermal conductivity were measured using heat flow meter apparatus. In addition, a 3D finite volume model considering the effect of surface to surface radiation, gas conduction, and thermal bridges through the spacer material and sealing material is developed. The model is validated with the experiments in this work and with the data for VG in the literature. The effect of vacuum pressure increase is simulated to mimic the vacuum deterioration problem and the effect of glazing size on the insulation performance of both VG and TVIP were investigated. The results indicate that for a smaller glazing area of less than 30 cm x 30 cm, the TVIP accomplished lower U-value compared with the VG at vacuum pressure of 0.1 Pa and 1 Pa. While, at a vacuum pressure of 10 Pa, the TVIP attained a lower U-value over the entire range of the investigated glazing sizes. Further, the edge-seal effect in the VG is diminished with the use of TVIP. Furthermore, the material cost per unit area of the TVIP is three times less than the cost of VG at laboratory scale. The results of the current study can guide vacuum window designers and researchers to further enhance the performance of TVIP based window to compete for the VG in the markets.
  • Water sorption property and cooling performance using natural mesoporous siliceous shale impregnated with LiCl for adsorption heat pump               
    Junya Togawa, Asami Kurokawa, Katsunori Nagano
    Applied Thermal Engineering, 173, 115241, 2020年03月, [査読有り]
  • The Effect of Groundwater Flow on the Thermal Performance of a Novel Borehole Heat Exchanger for Ground Source Heat Pump Systems: Small Scale Experiments and Numerical Simulation
    Ahmed A. Serageldin, Ali Radwan, Yoshitaka Sakata, Takao Katsura, Katsunori Nagano
    Energies, 13, 6, 1418, 1418, MDPI AG, 2020年03月, [査読有り]
    研究論文(学術雑誌), New small-scale experiments are carried out to study the effect of groundwater flow on the thermal performance of water ground heat exchangers for ground source heat pump systems. Four heat exchanger configurations are investigated; single U-tube with circular cross-section (SUC), single U-tube with an oval cross-section (SUO), single U-tube with circular cross-section and single spacer with circular cross-section (SUC + SSC) and single U-tube with an oval cross-section and single spacer with circular cross-section (SUO + SSC). The soil temperature distributions along the horizontal and vertical axis are measured and recorded simultaneously with measuring the electrical energy injected into the fluid, and the borehole wall temperature is measured as well; consequently, the borehole thermal resistance (Rb) is calculated. Moreover, two dimensional and steady-state CFD simulations are validated against the experimental measurements at the groundwater velocity of 1000 m/year with an average error of 3%. Under saturated conditions without groundwater flow effect; using a spacer with SUC decreases the Rb by 13% from 0.15 m·K/W to 0.13 m·K/W, also using a spacer with the SUO decreases the Rb by 9% from 0.11 m·K/W to 0.1 m·K/W. In addition, the oval cross-section with spacer SUO + SSC decreases the Rb by 33% compared with SUC. Under the effect of groundwater flow of 1000 m/year; Rb of the SUC, SUO, SUC + SSC and SUO + SSC cases decrease by 15.5%, 12.3%, 6.1% and 4%, respectively, compared with the saturated condition.
  • Thermal performance analysis of a new structured-core translucent vacuum insulation panel in comparison to vacuum glazing: Experimental and theoretically validated analyses               
    Takao Katsura, Saim Memon, Ali Radwan, Makoto Nakamura, Katsunori Nagano
    Solar Energy, 199, 326, 346, 2020年02月, [査読有り]
  • Modeling of adsorption heat pump system based on experimental estimation of heat and mass transfer coefficients               
    Sung-Hoon Seol, Katsunori Nagano, Junya Togawa
    Applied Thermal Engineering, 171, 115089, 2020年02月, [査読有り]
  • Evaluating Thermal Performance of Oval U-Tube for Ground-Source Heat Pump Systems from in Situ Measurements and Numerical Simulations
    Yoshitaka Sakata, Ahmed A. Serageldin, Takao Katsura, Motoaki Ooe, Katsunori Nagano
    Environmental Science and Engineering, 1483, 1491, 2020年, [査読有り]
    研究論文(国際会議プロシーディングス), A new-shaped U-tube with an oval cross-section has been developed to boost the heat transfer inside the borehole heat exchanger and to reduce the heat exchanger depth and the drilling cost. In addition, it could fit efficiently inside tight boreholes, so it is fitting for installing GSHPs at urban areas. This research evaluated the effectiveness in situ by thermal response tests at total 20 borehole heat exchangers in three sites, Japan. The in situ borehole thermal resistances were about 10–30% smaller with the oval U-tube than the circle U-tube. However, the spacers had an imperceptible impact probably because of the soil pressure to the U-tubes. Also, transient numerical CFD simulations were carried out to calculate the long-term performance of a household GSHP system with oval U-tubes. It indicated that the required lengths of a borehole heat exchanger could be reduced by about 14% in the fine soils and 15–19% in the coarse soils.
  • Adsorption desalination using natural mesoporous material impregnated with chloride substances
    Mitsuki Izawa, Fang He, Katsunori Nagano, Junya Togawa
    Refrigeration Science and Technology, 321, 326, 2020年, [査読有り]
    研究論文(国際会議プロシーディングス), Desalination is effective to solve problems of pure water shortage in many water stressed regions. However, the conventional technologies consume vast quantities of energy derived from fossil fuels, which cause increase of CO2 emissions and high operating cost. On the other hand, adsorption desalination (AD) employs the renewable energy sources and low temperature waste heat sources, which contributes to reducing fossil energy. This paper presents the performance of a laboratory scale AD whose thermal capacity is 100W using natural mesoporous material called Wakkanai siliceous shale (WSS) impregnated with chloride substances as the adsorbent. This material has been developed for the low-cost adsorption heat pump in our laboratory. The performance ratio (PR) and the specific daily water production (SDWP) are 0.41 and 25.0 m .t .day , respectively, at the half cycle time of 5 minutes. Finally, PR and SDWP were improved to 0.49 and 37.0 m .t .day , respectively with the cooling capacity recovery. 3 -1 -1 3 -1 -1
  • Heat transfer performance analysis of a novel curved surface radiant ceiling panel: Numerical approach
    Minzhi Ye, Ahmed A. Serageldin, Katsunori Nagano
    16th Conference of the International Society of Indoor Air Quality and Climate: Creative and Smart Solutions for Better Built Environments, Indoor Air 2020, 2020年
    研究論文(国際会議プロシーディングス), Although many studies had investigated the heating and cooling capabilities of a flat surface radiant ceiling panel, and a few tried to change the surface structure as well. Yet no one examined the concave curved and segmented surface, which is considered in the present study. Different curvature cord length to curvature radius ratios (L/R) from 0 to 1.5 (5 cases) are examined. This study also includes a comprehensive heat transfer analysis and exhausting thermal comfort assessment for each case. Three dimensional CFD model is developed and validated against the experimental results in the literature, the model shows a good agreement with acceptable accuracy. As a result, changing only the panel surface shape can enhance thermal performance and improve the indoor thermal comfort.
  • Enhancement of cooling performance of metal ceiling radiant cooling system by a novel panel with a concave and segmented surface
    Ahmed A. Serageldin, Minzhi Ye, Katsunori Nagano
    Proceedings of the International Conference of Architectural Science Association, 2020-November, 481, 490, 2020年, [査読有り]
    研究論文(国際会議プロシーディングス), This paper proposed a novel ceiling radiant cooling panel (CRCP) with a concave and segmented surface. Full-scale laboratory experiments are conducted to study the heat transfer characteristics extensively and thermal comfort conditions inside an environmental chamber coupled with four CRCP-s with a concave and segmented surface under various operating conditions. Moreover, a three-dimensional finite volume simulation was developed to study the conjugated heat transfer and fluid flow, as well as the thermal comfort conditions. The results show that the simulation achieves a good agreement with experimental results with an accuracy of 98.9 %. The proposed panel enhances the convection heat transfer by 61% and 23 % compared with the flat and inclined surface panels. The fluid inlet temperature of 18 ºC and the fluid flow rate of 1.5 L/min achieve the lowest temperature difference between the head and ankle level of 0.18 ºC; also, it shows the neutral PMV of 0. So, changing only the panel surface shape from ordinary flat to a concave and segmented surface gives a chance to use a lower fluid flow rate and higher inlet water temperature and maintains an acceptable comfortable level, which reveals the potential of energy saving by using this new panel.
  • Estimation of fast groundwater flow velocity from thermal response test results               
    Hobyung Chae, Katsunori Nagano, Yoshitaka Sakata, Takao Katsura, Takeshi Kondo
    Energy & Buildings, 206, 109571, 2019年11月, [査読有り]
    英語
  • Energy Conservation using New Structured-Core and Transparent Vacuum Insulation Panels: Numerical Simulation with Experimental Validation               
    Takao Katsura, Ali Radwan, Zhang Yang, Makoto Nakamura, Katsunori Nagano
    Solar Energy, 193, 885, 905, 2019年10月, [査読有り]
    英語, 研究論文(学術雑誌)
  • 地中熱ヒートポンプシステムの間接型地中熱交換器必要長さ全国500 mグリッド算定と評価               
    阪田義隆, 葛隆生, 長野克則
    土木学会論文集G, 75, 5, I_177, I_183, 2019年09月, [査読有り]
  • クローズド型地中熱ヒートポンプシステムの地中熱交換器規模決定に関する研究:個別シミュレーション決定法とその全国適用例               
    阪田義隆, 葛隆生, 長野克則
    日本地熱学会誌, 41, 3, 75, 89, 2019年07月, [査読有り]
    日本語, 研究論文(学術雑誌)
  • 地中熱ヒートポンプシステム:北海道における導入可能性の評価
    阪田義隆, 葛隆生, 長野克則
    北海道自然エネルギー研究, 13, 13, 17‐26, 26, 2019年06月30日, [査読有り]
    日本語
  • 全熱交換素子および稚内層珪質頁岩ローターの臭気移行特性               
    外川純也, 青木智恵美, 長野克則
    日本冷凍空調学会論文集, 36, 3, 109, 119, 2019年06月, [査読有り]
  • 潜熱顕熱の完全分離処理を目指したデジカントシステムの実証試験
    鍋島佑基, 外川純也, 長野克則
    日本冷凍空調学会論文集, 36, 3, 97, 108, 日本冷凍空調学会, 2019年06月, [査読有り]
    日本語
  • A new experimental method to separate interfacial and internal mass transfer on coated adsorbent               
    Sung-Hoon Seol, Katsunori Nagano, Junya Togawa
    Applied Thermal Engineering, 159, 113869, 2019年05月, [査読有り]
  • A design and simulation tool for ground source heat pump system using energy piles with large diameter
    Takao Katsura, Katsunori Nagano, Yohitaka Sakata, Hisashi Wakayama
    International Journal of Energy Research, 43, 4, 1505, 1520, Wiley, 2019年03月25日, [査読有り]
    研究論文(学術雑誌)
  • Study on building surface and indoor temperature reducing effect of the natural meso-porous material to moderate the indoor thermal environment               
    Tazia Rahman, Katsunori Nagano, Junya Togawa
    Energy and Buildings, 191, 59, 71, 2019年03月, [査読有り]
  • 500 M-GRIDDED ESTIMATION OF REQUIRED LENGHS FOR A CLOSED-TYPE BOREHOLE HEAT EXCHANGER IN A GROUND-SOURCE HEAT PUMP SYSTEM
    Yoshitaka SAKATA, Takao KATSURA, Katsunori NAGANO
    Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research), 75, 5, I_177, I_183, Japan Society of Civil Engineers, 2019年, [査読有り]
    研究論文(学術雑誌)
  • 少水量対応地中熱ヒートポンプビルマルチシステム設計・性能予測ツールの開発とその応用
    葛隆生, 中村靖, 長野克則, 阪田義隆
    日本冷凍空調学会論文集, 35, 4, 313‐324, 2018年12月31日, [査読有り]
    日本語
  • Thermo-hydraulic performance of the U-tube borehole heat exchanger with a novel oval cross-section: Numerical approach
    Ahmed A. Serageldin, Yoshitaka Sakata, Takao Katsura, Katsunori Nagano
    Energy Conversion and Management, 177, 406, 415, Elsevier BV, 2018年12月, [査読有り]
    英語, 研究論文(学術雑誌)
  • Importance of groundwater flow on life cycle costs of a household ground heat pump system in Japan
    Yoshitaka Sakata, Takao Katsura, Katsunori Nagano
    日本冷凍空調学会論文集, 35, 4, 365, 365, 2018年12月, [査読有り]
    英語
  • 井戸データベースを用いた地盤情報推定システムの開発 その2:確率加重平均による平均透水係数推定法の評価
    阪田義隆, 葛隆生, 長野克則, 丸井敦尚
    地下水学会誌, 60, 3, 273‐288, 2018年08月31日, [査読有り]
    日本語
  • 地中熱利用ヒートポンプシステム導入によるCO2排出量削減の全国評価:戸建住宅への暖房利用を例として               
    阪田義隆, 葛隆生, 長野克則
    土木学会論文集G(環境), 74, 5, I_359, I_367, 2018年08月, [査読有り]
    日本語
  • 光透過性を有する薄型真空断熱材の開発に関する研究 第1報 構造計算と伝熱計算による芯材検討および真空断熱材の試作と性能評価
    葛隆生, YANG Zhang, 相原昌博, 中村真人, 長野克則
    太陽エネルギー, 44, 2, 49, 57, 一般社団法人 日本太陽エネルギー学会, 2018年03月31日, [査読有り]
    日本語, 研究論文(学術雑誌), <p>This study aims at developing the vacuum insulation panels (VIPs) with small thickness and light transmittance to contribute retrofitting insulation for existing buildings. The authors are focus on producing the slim and translucent VIPs with vacuum layer which hold by spacers. Firstly, the outlines of vacuum layer type VIPs were introduced. Next, the structural calculation was carried out as a mechanical analysis to determine the specific array of spacers to pillars supported type. Then, the heat transfer model applying the one-dimensional calculation was developed to predict the insulation performance of VIPs. After that, the authors conducted an experiment applying the guarded hot plate method in order to verify the apparent thermal conductivity of VIP according to the set pressure. The result showed that the apparent thermal conductivity was less than 0.1 W/(m<tt>・</tt>K) and was enough low. Finally, the VIPs with different core materials were trial produced and the apparent thermal conductivity were evaluated by the heat flux method.</p>
  • 全国地中熱ポテンシャルマップ構築への取り組み-大阪平野における地中熱利用の可能性と課題-
    阪田義隆, 葛隆生, 長野克則, 丸井敦尚
    地下水技術, 59, 2,3,4, 41, 50, 2018年03月30日, [査読有り], [招待有り]
    日本語
  • Development of adsorptiopn heat pump using natural mesoporous materials with Licl part-1 evaluation of water adsorption ability of adsorbent               
    Junya Togawa, Seiya Oomae, Hiroaki Kuroishi, Asami Kurokawa, Katsunori Nagano
    ACRA 2018 - 9th Asian Conference on Refrigeration and Air-Conditioning, Asian Conference on Refrigeration and Air Conditioning (ACRA), 2018年
    英語, 研究論文(国際会議プロシーディングス), This study is a development of adsorption heat pump (AHP) using a natural meso-porous material of Wakkanai siliceous shale (WSS) impregnated with lithium chloride. In this paper, the powder of WSS impregnated with lithium chloride was prepared as the adsorbent for AHP. In addition, aluminum fibers were added into the adsorbent to improve the thermal conductivity. Water vapor adsorption performance was evaluated from the sorption isotherm curve at the various temperature. The theoretical adsorption amount was estimated as 0.33 g/g for the 20 wt % LiCl-WSS (Regeneration, evaporation and condensation temperature were 80, 15, 30 ºC, respectively). For the evaluation of cooling power, this adsorbent was filled in between the gaps of the fin tube of heat exchanger. The COP was increased with increasing the adsorption time. The COP cooling and SCP showed 0.44 and 398 W/kg, respectively.
  • Development of adsorption heat pump using natural mesoporous materials with LiCl Part-3 Optimum design and performance predictions of 10 kW AHP using 3-D numerical simulation program               
    Katsunori Nagano, Mayu Inoue, Junya Togawa
    ACRA 2018 - 9th Asian Conference on Refrigeration and Air-Conditioning, Asian Conference on Refrigeration and Air Conditioning (ACRA), 2018年
    英語, 研究論文(国際会議プロシーディングス), This paper is the part three of the development of a cost-effective adsorption heat pump (AHP) using a natural meso-porous material which is Wakkanai siliceous shale (WSS) impregnated with LiCl. The optimum design of an adsorbent bed on a corrugate type heat exchanger and the prediction of the 10 kW scale AHP performances are examined by using a developed 3-D numerical simulation program. The actual effective thermal conductivity of the adsorbent mixed with aluminum fibers and its overall mass transfer coefficient are measured. The heat and mass transfer characteristics are analyzed through the calculating results and the optimum size of the corrugate type heat exchanger are discussed. The parametric analyses show that the largest volumetric cooling power (VCP) is 210 W/L and COP is 0.45 when the thickness of is 12 mm. Next, influence of an interval of a water channel is discussed. It is understood that a reasonable p is 6 mm. In this case COP and VCP is 0.49 and170 W/L, respectively.
  • Development of simulation tool for the shallow ground source heat pump system using vertical spiral ground heat exchangers and its application               
    Takashi Higashitani, Takao Katsura, Katsunori Nagano, Hitoshi Akai, Motoaki Oe
    ACRA 2018 - 9th Asian Conference on Refrigeration and Air-Conditioning, Asian Conference on Refrigeration and Air Conditioning (ACRA), 2018年
    英語, 研究論文(国際会議プロシーディングス), Vertical spiral ground heat exchanger(VSGHEX) is paid attention for cost reduction of ground source heat pump(GSHP) systems. However, VSGHEX has huge thermal capacity so that the temperature calculation around a VSGHEX needs to take account for the thermal capacity. In this paper, an approach based on capacity resistance model(CaRM) was presented. The model was validated comparing with numerical model. In addition, the case study of GSHP installation by VSGHEXs was carried out.
  • Simulation tool for ground-source heat pump system with multiple ground heat exchangers               
    Takao Katsura, Katsunori Nagano
    ASHRAE Transactions, 124, 92, 101, ASHRAE, 2018年
    英語, 研究論文(国際会議プロシーディングス), This paper discusses a developed simulation tool for ground-source heat pump (GSHP) systems with multiple ground heat exchangers (GHEXs) by combining the infinite cylindrical source (ICS) solution with the infinite line source (ILS) solution. In the developed tool, superposition of the temperature field in space was applied to calculate the underground temperature due to heat injection from multiple GHEXs. Then, the ICS solution was applied for temperature change due to heat injection of the considered GHEX and the ILS solution was applied for temperature change due to the heat injection of other neighboring GHEXs. In this paper, firstitis shown thatthe temperature response of the ICS can be regarded as that of the ILS in cases where the distance from the heat source to the considered point becomes larger. Next, the method for the high-speed calculation of temperature change due to heat injection of the multiple GHEXs is described. In addition, the advantages of the calculation method in the developed tool are introduced. Finally, considering the case of a GSHP system installed in an office building in Tokyo, the temperature change of the primary side of the heat pump is calculated, and its reproducibility is verified by comparison with measured values. The results show the difference between the calculated and measured values to be up to 5°C (9°F) and less than 2°C (3.6°F) in most cases, thus confirming the reproducibility of this tool.
  • 回転するローター内部の温湿度挙動測定手法に関する研究
    鍋島 佑基, 松浦 大介, 木村 竜士, 長野 克則
    日本冷凍空調学会論文集, 35, 3, 181, 181, 公益社団法人 日本冷凍空調学会, 2018年
    日本語,

    本研究では稚内層珪質頁岩(WSS)デシカントローターの最適化を目的に,IoT 用無線式小型センサーによるローター内温湿度測定を試みた.小型センサーを用いて間断なく回転するデシカントローター内部で生じている熱・物質移動現象を測定するため,本報ではまず,温湿度変化に伴うセンサー応答遅れの補正を行った.次に直径350mmφ,厚み60mm のデシカントローターの各表面から5mm の地点にセンサーを埋設して通風試験を行った結果,ローター表面付近の除湿再生量の推移を可視化することができた.さらに実験結果から,再生温度50 °C において除湿のピークは吸着ゾーン初期に確認できたが,ローター回転数が7 rph から30 rph に増加することで再生量のピークは250 °から330 °近傍まで移動する傾向が確認された.回転数の低い7 rph のケースでは吸着より早く脱着が完了しており,脱着速度の方が早いことが確認された

  • Investigation into Window Insulation Retrofitting of Existing Buildings Using Thin and Translucent Frame-Structure Vacuum Insulation Panels
    Zhang Yang, Takao Katsura, Masahiro Aihara, Makoto Nakamura, Katsunori Nagano
    Energies, 11, 2, 1, 13, 2018年, [査読有り]
    英語
  • Multilayer-concept thermal response test: Measurement and analysis methodologies with a case study
    Yoshitaka Sakata, Takao Katsura, Katsunori Nagano
    GEOTHERMICS, 71, 178, 186, PERGAMON-ELSEVIER SCIENCE LTD, 2018年01月, [査読有り]
    英語, 研究論文(学術雑誌), A multilayer-concept thermal response test is proposed by incorporating the standard test with a pair of fiber-optic distributed temperature sensors in the U-tube. The heating exchange rates in any vertical segment are estimated from the sequential temperature data. The ground thermal conductivity of each sub-layer is calculated using the line heat source model, in which the heating exchange rates and the temporal temperature slopes are determined at their convergence as the thickness increases. The convergence analysis continues downward until reaching the borehole bottom to obtain the stepwise conductivity. A case study of Sapporo, Japan, is shown with the sensitivity analysis of the convergence threshold.
  • 稚内層珪質頁岩を用いたデシカント空調の開発 ―第9報: パージゾーン導入による給気温度低減の検討―
    鍋島佑基, 長野克則, 外川純也, 都筑和代
    日本冷凍空調学会論文集, 35, 1, 49, 59, 日本冷凍空調学会, 2018年, [査読有り]
    日本語
  • 稚内層珪質頁岩を用いたデシカント空調の開発 ―第8報: 全熱交換素子と組み合わせたユニットの検討―               
    鍋島佑基, 長野克則, 外川純也, 都筑和代
    日本冷凍空調学会論文集, 35, 1, 11, 22, 2018年, [査読有り]
    日本語
  • Performance of LiCl Impregnated Mesoporous Material Coating over Corrugated Heat Exchanger
    Hongzhi Liu, Katsunori Nagano, Junya Togawa
    Energies, 11, 1565, 1, 5, 2018年, [査読有り]
    英語
  • 確率加重平均法による地盤の有効熱伝導率の推定に関する研究
    阪田義隆, 葛隆生, 長野克則
    日本地熱学会誌, 40, 1, 33, 44, 2018年01月, [査読有り]
    日本語
  • Development of numerical heat transfer and the structural model to design slim and translucent vacuum layer type insulation panels to retrofitting insulation in existing buildings
    Zhang Yang, Takao Katsura, Masahiro Aihara, Makoto Nakamura, Katsunori Nagano
    Energies, 10, 12, 1, 15, MDPI AG, 2017年12月01日, [査読有り]
    英語, 研究論文(学術雑誌), The authors develop slim and light-weight vacuum insulation panels (VIPs) by producing vacuum layers with spacers and plastic plates. The developed VIPs have the advantages of a low cost and easy installation, thus facilitating retrofitting insulation of existing buildings. In addition, one of the developed VIPs is slim and translucent so it can be easily used for windows in an internal installation. In this paper, the authors first propose a vacuum layer type slim translucent VIP and focus on a reasonable design method. Next, the authors introduce the design process in which the structural design is obtained with element mechanical analysis and a three-dimensional analysis is conducted for the VIP element. In the study, a heat transfer model is used to predict the insulation performance through finite element analysis (FEA). Subsequently, the authors perform an experiment to measure the thermal conductivity in a guarded hot plate apparatus to validate the performance prediction. Finally, case studies are performed to confirm how the different design conditions affect the insulation performance. The optimum design of the vacuum layer type slim and translucent VIP will have a sufficient structural strength to hold and maintain the vacuum layer. The thermal conductivity is approximately 0.007 W/(m · K), which can effectively improve the insulation performance in applications.
  • Facilities introduction planning of a microgrid with CO2 heat pump heating for cold regions
    Shin'ya Obara, Katsunori Nagano, Masaki Okada
    ENERGY, 135, 15, 486, 499, PERGAMON-ELSEVIER SCIENCE LTD, 2017年09月, [査読有り]
    英語, 研究論文(学術雑誌), Fulfilling heating requirements in cold regions using fossil fuels can create problems in terms of excessive greenhouse gas emissions, making the replacement of conventional heating systems with electric heat pumps powered by renewable energy sources a desirable goal. To help address this issue, this paper examines the introduction of independent microgrids consisting of natural gas combined cycle and large-scale photovoltaic (L-PV) generating sources accompanied by electric heat pump capacity. These results help to clarify the optimal output rate of L-PV to the overall output of such a microgrid. Furthermore, this paper examine a dynamic-characteristics model of a CO2 split cycle heat pump in terms of the error of the supply-and-demand balance. This paper show that introduction of the proposed microgrid can significantly reduce the environmental and economic impact. This study clarified the environmental capability and economical efficiency of the microgrid for cold regions under management of electric power quality. When an electric power unit price and CO2 emissions of the proposal microgrid are referred to the domestic price based on official announcements of the Japanese government, the amount of CO2 reduction and electric power unit price of the proposal system can expect 48% and 30% reduction in Sapporo, respectively. (C) 2017 Elsevier Ltd. All rights reserved.
  • 全国地盤物性データベースを用いた地中熱利用ヒートポンプ暖房システムの導入効果分析
    阪田義隆, 葛隆生, 長野克則
    土木学会論文集G(環境), 73, 5, I-89, I-98, 2017年09月, [査読有り]
    日本語
  • 井戸データベースを用いた地盤情報推定システムの開発:地質区分のクリギング推定と逐次パラメータ決定法
    阪田義隆, 葛隆生, 長野克則, 丸井敦尚
    地下水学会誌, 59, 2, 105, 123, 2017年06月, [査読有り]
    日本語
  • Field Analysis of Stepwise Effective Thermal Conductivity along a Borehole Heat Exchanger under Artificial Conditions of Groundwater Flow
    Yoshitaka Sakata, Takao Katsura, Katsunori Nagano, Manabu Ishizuka
    Hydrology, 4, 2, 21, 21, MDPI AG, 2017年03月29日, [査読有り]
    英語, 研究論文(学術雑誌)
  • Energy Saving Effect of Desiccant Ventilation System Using Wakkanai Siliceous Shale
    Yuki Nabeshima, Jun-ya Togawa, Katsunori Nagano, Tsuzuki Kazuyo
    AMER INST PHYSICS, 1892, 160002, AMER INST PHYSICS, 2017年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), The nuclear power station accident resulting from the Great East Japan Earthquake disaster has resulted in a constrained electricity supply. However, in this Asian region there is high temperature and high humidity and consequently dehumidification process requires a huge amount of energy. This is the reason for the increasing energy consumption in the residential and commercial sectors. Accordingly, a high efficiency air-conditioning system is needed to be developed. The desiccant ventilation system is effective to reduce energy consumption for the dehumidification process. This system is capable of dehumidifying without dew condensing unlike a conventional air-conditioning system. Then we focused on Wakkanai Siliceous Shale (WSS) as a desiccant material to develop a new desiccant ventilation system. This is low priced, high performance, new type of thing. The aim of this study is to develop a desiccant ventilation unit using the WSS rotor which can be regenerated with low-temperature by numerical calculation. The results of performance prediction of the desiccant unit, indicate that it is possible to regenerate the WSS rotor at low-temperature of between 35 -45 degrees C. In addition, we produced an actual measurement for the desiccant unit and air-conditioning unit. This air-conditioning system was capable to reduce roughly 40 % of input energy consumption.
  • A microgrid comprising an interconnected solid oxide fuel cell and hydraulic generator for use in a sustainable city
    Shin’ya OBARA, Katsunori NAGANO, Jorge MOREL, Takao KATSURA, Yoshitaka SAKATA, Kazushige KIKUTA
    Mechanical Engineering Journal, 4, 2, 1, 15, 2017年, [査読有り]
    英語
  • 地中熱交換器内の熱媒体温度挙動を用いた地層別有効熱伝導率の推定
    阪田 義隆, 葛 隆生, 翟 健, 長野 克則
    土木学会論文集G(環境), 74, 3, 50, 60, 公益社団法人 土木学会, 2016年09月, [査読有り]
    日本語, 本研究では,地中熱交換器の熱応答試験において,2本の光ファイバー温度計をUチューブに挿入し,熱媒体の往き還りの温度挙動を測定することで,地層別の有効熱伝導率を推定する手法を提案する.従来の線熱源理論に基づく解析法を適用し,計算に必要となる温度の時間変化は光ファイバー温度計の多点測定データから層内で平均し,熱交換量は温度の深度勾配の往き還りの和から求める.その際,測定データは系統誤差の校正と偶然誤差を最小とする平均処理で補正する.北海道旭川市での解析事例では,有効熱伝導率は層厚20m以上で安定した推定値が得られ,最上位の砂礫層の値は他2層より約1.5倍高い結果となった.また3層の層厚重み付け平均は従来法の結果と整合し,スムージング,ブートストラップ法,回復時法とデータ処理を変えても結果に差はなかった.
  • 複層地盤を考慮した地中熱交換器のシミュレーションツールの開発とその応用
    葛隆生, 長野克則, 中村靖
    冷凍, 91, 1064, 399‐400, 2016年06月, [査読有り]
    日本語
  • Field measurement of indoor air quality and airborne microbes in a near-zero energy house with an earth tube in the cold region of Japan
    Yoonkyung Kang, Katsunori Nagano
    SCIENCE AND TECHNOLOGY FOR THE BUILT ENVIRONMENT, 22, 7, 1010, 1023, TAYLOR & FRANCIS INC, 2016年, [査読有り]
    英語, 研究論文(学術雑誌), This study was conducted to evaluate the level of microbial contamination of indoor air during 3years for two residences in one building equipped with heat recovery ventilation devices and located in Kimobetsu town of Hokkaido, Japan. This article documents a case study aimed at monitoring the microbes contaminations indoors for a safe use of energy saving ventilation devices and sanitary indoor air. This articles describes an investigative approach with three components. First, the authors evaluated the indoor air quality and microbial concentration by comparing the concentrations of particulate matter (PM10 and PM2.5), carbon dioxide, and airborne bacteria and fungi of indoor air and outdoor air during spring, summer and winter. Second, the microbial concentration inside an earth tube and a fixed sensible heat exchanger was evaluated by measuring the airborne microbial concentration of the supply air. Third, the authors assessed the possibility of microbial contamination inside the earth tube using the fungal index and by measuring temperature and relative humidity at the tube's outlet airflow. The results showed that the total concentration of airborne fungi was higher in summer than in spring or winter and that the fungal genera Cladosporium sp. and Penicillium sp. were dominant in the samples. Additionally, it was found that the environment inside the earth tube allowed easy growth of fungi from May to September with the highest fungal index measured in August. It was also confirmed that the earth tube did not affect the supply air for a building constructed 4years ago.
  • A study of the energy consumption and airborne microbe concentration in the Sapporo underground walkway, in a cold region of Japan
    Yoonkyung Kang, Katsunori Nagano
    SCIENCE AND TECHNOLOGY FOR THE BUILT ENVIRONMENT, 22, 7, 1050, 1059, TAYLOR & FRANCIS INC, 2016年, [査読有り]
    英語, 研究論文(学術雑誌), The present study sought to evaluate the energy consumption, indoor air quality and concentration of airborne bacteria and fungi in the Sapporo underground walkway, which is in a cold region of Japan. The energy consumption, temperature, relative humidity, and carbon dioxide concentrations of the underground walkway were investigated for 4years from its opening in 2011 (until 2014). The temperature, relative humidity, and carbon dioxide concentrations were automatically detected using sensors and data from Sapporo city hall. To evaluate the microbial contamination in the ventilation system and indoors, the concentrations of airborne bacteria and fungi were measured on 2days (a weekday and a weekend day) during opening hours in both summer and winter. The concentration of airborne microbes in the supply air, indoor air, and outside air was compared. Species of airborne bacteria were identified using 16S rDNA sequence analysis. The energy use intensities were decreased in 2013, when the walkway temperature was changed during both winter and summer. The carbon dioxide concentration in the walkway was maintained below 1000ppm. The number of airborne bacteria and fungi in the supply air from the ceiling diffuser was lower than those in the outdoor and indoor air. These results indicate that both energy consumption and indoor air quality were maintained in the walkway throughout the 4-year period. This study could be helpful for developing the related standards for indoor air quality and for developing control strategies to properly operate air conditioning and ventilation systems in underground spaces.
  • Installing the low flow circulation ground source heat pump system in the technology center and its performance analysis
    Yasushi Nakamura, Takao Katsura, Katsunori Nagano
    AIJ Journal of Technology and Design, 21, 49, 1139, 1142, Architectural Institute of Japan, 2015年10月01日, [査読有り]
    日本語, 研究論文(学術雑誌), The authors analyzed the low flow circulation ground source heat pump system, which has the variable water volume control in the primary side, in the office building. It is confirmed that the electric power of circulation pump was reduced as 85% compared to the constant water volume. The difference between the system COP including the circulation pump and the heat pump COP was small. Additionally, the effect of energy saving compared to the conventional air source heat pump system was 33%.
  • 複層地盤を考慮した地中熱交換器のシミュレーションツールの開発とその応用
    葛隆生, 長野克則, 中村靖
    日本冷凍空調学会論文集, 32, 3, 335, 344, 公益社団法人 日本冷凍空調学会, 2015年09月, [査読有り]
    日本語, 本論文では,地下水流動存在下の地中熱交換器周囲温度を計算する手法を,深度毎に分割することで複層地盤に対応させた,地中熱交換器内部熱媒温度の計算モデルについて示した.また,計算モデルを応用して,熱応答試験時に得られる見かけ上の有効熱伝導率から,地下水流動の存在する層の全層に占める割合や地下水流速を推測する方法について検討した.結果より加熱時間50 h の熱応答試験で得られる見かけ上有効熱伝導率が4.5 W・m-1・K-1 を超えると,全層に対して25%以上の地層で300 m・ y-1 以上の地下水流動があることが示唆された.また,地下水流速が300 m・y-1 以上の地層が存在する地点での熱応答試験では,経過時間50 h から150 h における見かけ上有効熱伝導率の上昇率に対する,地下水流動の存在する層の全層に占める割合は,ほぼ一致することが確認できた.
  • 冷却塔を併用したハイブリッド地中熱ヒートポンプシステムの設計・性能予測ツールの開発とその応用
    葛隆生, 長野克則, 中村靖
    日本冷凍空調学会論文集, 32, 3, 325, 334, 公益社団法人 日本冷凍空調学会, 2015年09月, [査読有り]
    日本語, 冷却塔を併用したハイブリッド地中熱ヒートポンプシステムの設計・性能予測とコミッショニングを行うために,筆者らはシステムのシミュレーションツールを開発した.そして,このツールを用いて,北九州市の新しいオフィスビルに導入されたハイブリッド地中熱ヒートポンプシステムの性能を予測した.その結果,このシステムの冷房期間の期間成績係数(SPF)は5.4 と高い値になることがわかった.また,ツールを用いて地中熱交換器と冷却塔の接続方法や,冷却塔の運転方法を検討した.その結果,冷却塔を地中熱交換器の前に接続した場合に,システムは最も高いSPF を示すことが確認された.さらに,この場合において,ヒートポンプの一次側入口温度に応じて冷却塔の運転を行うことにより,更なるSPF の向上が可能であることがわかった.
  • Experimental testing of a small sorption air cooler using composite material made from natural siliceous shale and chloride
    Hongzhi Liu, Katsunori Nagano, Atsushi Morita, Junya Togawa, Makoto Nakamura
    APPLIED THERMAL ENGINEERING, 82, 82, 68, 81, PERGAMON-ELSEVIER SCIENCE LTD, 2015年05月, [査読有り]
    英語, 研究論文(学術雑誌), A sorption air cooler experimental setup including a reactor and fin tube condenser/evaporator was built The reactor was developed with inner copper fins and dual layers of curing copper meshes. Composite material made by impregnating LiCI into the mesopores of Wakkanai Siliceous Shale (WSS) micro-powders was packed between the intervals of two fins. Heat transfer was enhanced by the attached fins, and the dual layers of curing meshes installed between each interval of two fins were designed to improve the sorbate mass transfer. On the other hand, the fin-tube evaporator/condenser with fins outside is valuable for improving the convective heat transfer between the functional water inside the evaporator/condenser and the flowing outside heat transfer medium, air.
    The sorption capacity of the composite material increased dramatically after being impregnated with LiCI. Among the four tested samples, WSS + 40 wt% LiCl exhibits the best performance. A regeneration temperature of 80 degrees C appears to be optimal for obtaining both a high COP and high specific cooling power. A lower condensation temperature can increase the cooling power. The sorption and desorption times of 60 min yield a reasonable compromise between cooling COP and mass specific cooling powers. The developed sorption air cooler system using WSS + 40 wt% LiCl can store heat at temperatures below 100 degrees C and produce cooling energy with a cooling coefficient of performance (COP) of approximately 0.3. (C) 2015 Elsevier Ltd. All rights reserved.
  • パッケージエアコンディショナの年間効率向上を目指した研究開発
    吉田 康孝, 長野 克則, 小山 昌喜, 戸草 健治
    日本冷凍空調学会論文集, 32, 3, 207, 219, 公益社団法人 日本冷凍空調学会, 2015年
    日本語, 低負荷において効率向上を図った圧縮機,蒸気圧縮方式と自然循環方式で共用出来る熱交換器,低負荷での不要な断続運転を防止する適応制御,低外気温度にて高効率運転が可能な自然循環方式とその運転制御を搭載したパッケージエアコンを開発し,効率を計測した.その結果,以下の結論を得た.
    (ⅰ)環境試験室においては,年間効率が現状比1.51 倍であった.
    (ⅱ)実使用においては,2012 年の外気温度条件で,札幌にある北海道大学の共同実験室で現状比1.58 倍,静岡にある日立アプライアンスのCAE ルームでは1.67 倍となった.
    (ⅲ)実使用の計測データを平均的な外気温度に修正したところ,東京の標準的な事務所において現状比1.55 倍となる事が分かった.
  • パッケージエアコンディショナの年間効率向上を目指した研究開発:-第1 報:パッケージエアコンディショナの開発-
    吉田 康孝, 長野 克則, 小山 昌喜, 戸草 健治
    日本冷凍空調学会論文集, 32, 2, 121, 133, 公益社団法人 日本冷凍空調学会, 2015年
    日本語, 効率を実負荷に合わせ現状比1.5 倍の年間効率の効率向上を目指したパッケージエアコンディショナの開発を実施し,以下を開発した. (ⅰ)空調負荷率30~40%において効率向上を図った高効率ワイドレンジスクロール圧縮機 (ⅱ)蒸気圧縮方式と冷媒自然循環方式に共用出来る熱交換器 (ⅲ)低負荷での不要な断続運転を防止する適応制御システム (ⅳ)低外気温度条件にて高効率運転が可能な冷媒自然循環方式とその運転アルゴリズム また机上検討にて現状機と開発機の年間効率の比較を行ったところ,現状比1.52 倍となる事が分かった.
  • A composite material made of mesoporous siliceous shale impregnated with lithium chloride for an open sorption thermal energy storage system
    Hongzhi Liu, Katsunori Nagano, Junya Togawa
    SOLAR ENERGY, 111, 186, 200, PERGAMON-ELSEVIER SCIENCE LTD, 2015年01月, [査読有り]
    英語, 研究論文(学術雑誌), In this study we developed a composite mesoporous honeycomb element based on Wakkanai siliceous shale (WSS) and lithium chloride (Lid), to act as a thermal energy storage medium that can directly contact the functional air in an open sorption thermal energy storage system. The mesopores of the WSS were filled with LiCl to improve its sorption capability as a new sorption thermal energy storage material. The honeycomb thermal energy storage element impregnated with 9.6 wt% LiCl was installed in the developed open sorption thermal energy storage experimental setup. The experimental results showed that this impregnated honeycomb element could be regenerated at a lower regeneration temperature, even at 60 degrees C, and also exhibited high volumetric heat storage density. Furthermore, at a certain regeneration temperature, the element impregnated with 9.6 wt% LiCl supplied air with a relatively constant high outlet air temperature compared to the element filled with 22.4 wt% CaCl2 under the same inlet air conditions in the sorption process, and the proposed element was less affected by the humid air flow rate. The sorption rate was observed to significantly affect the outlet air temperature during the sorption process. We confirmed that the developed composite material filled with LiCl exhibited good stability, boosting the possibility of its long-term use. (C) 2014 Elsevier Ltd. All rights reserved.
  • Numerical simulation of an open sorption thermal energy storage system using composite sorbents built into a honeycomb structure
    Hongzhi Liu, Katsunori Nagano
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 78, 648, 661, PERGAMON-ELSEVIER SCIENCE LTD, 2014年11月, [査読有り]
    英語, 研究論文(学術雑誌), A new composite mesoporous honeycomb material was developed to be a thermal energy storage medium that can contact the functional fluid directly. In our previous study, this honeycombed composite material acted as a promising sorption thermal energy storage medium in an open system, exhibiting a lower regeneration temperature as 80 degrees C, high volumetric heat storage density, and high stability. In the present study, a one-dimensional transient model was used to predict both the heat storage process (desorption process) and heat release process (sorption process) occurring in the open sorption thermal energy storage unit. Our model was validated using the experimental results obtained in our previous experiments, and a close agreement was observed for the sorption process. Some discrepancy was observed in the desorption process, but it has been explained. The sorption and desorption processes were simulated repeatedly for 20 cycles, whose result was also compared with the experimental result. The operating parameters of the open thermal energy storage system were evaluated to determine its operation performance. Finally, our open thermal energy storage system was assumed to be incorporated into a paint-drying system, within which the heat storage unit is regenerated for 10 h by the exhaust heat produced by a blower in the daytime and releases its stored heat during the nighttime for 14 h. The simulation result shows that almost 51.3% of the blower's waste heat can be reutilized if the proposed thermal energy storage system is incorporated. (C) 2014 Elsevier Ltd. All rights reserved.
  • The assessment of microbial contamination on energy recovery ventilation devices in the airtight-house               
    Yoonkyung Kang, Katsunori Nagano, Makoto Nakamura
    Indoor Air 2014 - 13th International Conference on Indoor Air Quality and Climate, 243, 249, International Society of Indoor Air Quality and Climate, 2014年
    英語, 研究論文(国際会議プロシーディングス), To evaluate the level of microbe contamination of indoor air in a building installed with heat recovery ventilation devices. This study carried out in a residential house located in Hokkaido, Japan using a two-fold approach. First, the microbial concentration for heat recovery ventilation devices evaluated by measuring of airborne microbes indoors, around the ceiling diffuser and outdoors for spring, summer and winter. The total concentration of airborne microbes in the ceiling diffuser was lower than indoors. Second, the possibility of microbial contamination in the EAHE was evaluated and calculated using the fungal index by measuring temperature and relative humidity at the outlet airflow of the EAHE. The highest fungal index in the year was in August. We predicted the fungal growth in the EAHE in summer. The study can also be the basics baseline research for microbial contamination of a building installed with heat recovery ventilation devices.
  • 稚内層珪質頁岩を用いたデシカント空調の開発:-第7 報:外気条件に対する予冷・再生温度の検討-
    鍋島 佑基, 長野 克則, 外川 純也
    日本冷凍空調学会論文集, 31, 2, 111, 121, Japan Society of Refrigerating and Air Conditioning Engineers, 2014年
    日本語, The objective of this study is to develop a desiccant system using Wakkanai Siliceous Shale (WSS). This article is the 7th report of the series. In the previously articles, we reported a developed desiccant unit to achieve the target amount of dehumidification. This unit consists of two desiccant rotors and two heat exchangers for precooling and two heat exchangers for regeneration. In this paper, the authors have made a mathematical simulator of this desiccant unit to estimate the supply air conditions. The input conditions for regeneration and precooling have been evaluated by using this program. Firstly, the calculation precision of the program is confirmed by comparison with experimental results. Secondly, to minimize the input energy for the desiccant unit, input temperature for precooling and regeneration are evaluated. The conditions are obtained by controlling of precooling temperature depression without occurrence of dew condensing on the heat exchangers. Finally, performance prediction was carried out to obtain the energy saving efficiency in various areas in Japan. As a result, the unit reduced the energy for dehumidification by 30 % to 18 % in comparison to dew condensing process.
  • 種々の透湿膜の水蒸気および臭気物質の透過性に関する研究
    草間 友花, 長野 克則, 中村 真人
    日本建築学会技術報告集, 20, 45, 637, 640, 日本建築学会, 2014年, [査読有り]
    日本語, 研究論文(学術雑誌), This paper shows a study on permeability of water vapor and odor substances through six kinds of permeable film including viscos coated paper. The water vapor permeability can be indicated as proportional to the water vapor pressure difference. In addition, gas permeable barrier characteristics to odor substances such as ammonia and toluene were examined by using calibrated electrical gas sensors. It was concluded that the viscos coated paper has better water vapor and gas barrier performance compared to the others.
  • Evaluating the performance of a large borehole ground source heat pump for greenhouses in northern Japan
    Huai Li, Katsunori Nagano, Yuanxiang Lai, Kazuo Shibata, Hikari Fujii
    ENERGY, 63, 387, 399, PERGAMON-ELSEVIER SCIENCE LTD, 2013年12月, [査読有り]
    英語, 研究論文(学術雑誌), The objective of this study was to use both field data and a numerical simulation to examine the long-term performance and environmental effects of a large GSHP (ground source heat pump) system that heats and cools industrial greenhouses in a cold region. A large vertical GSHP system was installed in the city of Akabira in the north of Hokkaido, Japan to provide heating and cooling for 12 greenhouses. The system has a maximum capacity of 640 and 648 kW for heating and cooling, respectively. The system was monitored and analyzed from Oct. 2010 through May 2011. The system had a COP (coefficient of performance) of 3.0 and SCOP (system coefficient of performance) of 2.7. The average heat extraction rate of the system was approximately 27.7 W/m. In addition, the ground temperature at a depth of 40 m decreased from approximately 7.8 degrees C to 0 degrees C after 8 months of operation. A numerical model of the system was developed in FEFLOW to predict its future behavior under conditions where the demand for heating surpasses the demand for cooling. The simulation results suggest that the system could maintain the heat exchange rate for several years without significantly compromising its performance. The risk of operating the system under unbalanced heating and cooling loads was addressed via case studies. Groundwater flow decreases the risk of operating the system when the heat extraction was much higher or lower than the heat injection. (C) 2013 Elsevier Ltd. All rights reserved.
  • 冷水・冷却水変流量制御時における吸収式冷凍機の動特性解析
    藤居 達郎, 長野 克則
    日本冷凍空調学会論文集, 30, 3, 191, 202, Japan Society of Refrigerating and Air Conditioning Engineers, 2013年09月30日
    日本語, In the field of the central air-conditioning systems, variable water volume control (VWV) has been brought to attention to reduce the electricity consumed by water pumps, as well as to improve component performances. In the VWV of chilled water and cooling water passed through absorption chillers, what is important is the compatibility of energy saving and reliable operation while also controlling water flow rate and heat input. We dynamically simulated an absorption chiller to investigate this system. This chiller both calculates and transmits the controlled flow rate of chilled water and cooling water. Heat input control is simulated for both continuous and three position control. As the simulation result with assumption of cooling load profile, the estimated electricity reduction ratio is approximately 70% for the chilled water pump and 60% for the cooling water pump compared to the case of constant water volume system. On the other hand, cooling efficiency, defined as accumulated cooling calorie per accumulated heat input, is 99.5% of the constant water volume system, for continuous control. To improve the reliability of the operation, output temperature of chilled water is kept at 7±2°C in both continuous and three position controls.
  • Impact of control schemes of a monovalent inverter-driven water-to-water heat pump with a desuperheater in continental and subtropical climates through simulation
    David L. Blanco, Katsunori Nagano, Masahiro Morimoto
    APPLIED ENERGY, 109, 374, 386, ELSEVIER SCI LTD, 2013年09月, [査読有り]
    英語, 研究論文(学術雑誌), An application of a novel steady-state simulation of a monovalent inverter-driven water-to-water heat pump with a desuperheater is presented. The simulation is capable of modeling and managing the different operation modes of the system such as combined space heating and domestic hot water, in order to provide realistic results, from which four control schemes based on two electricity tariff plans were developed. The schemes were tested on a subject low energy house for Tokyo and Sapporo, in Japan, for the coldest day of the year and for the heating season. Emphasis was given to the short-term domestic hot water storage. The results show that the application of the schemes with a flexible electricity tariff had lower cost over the scheme that used the flat rate pricing plan. Moreover, it was shown that no unique scheme was able to minimize the cost and electrical consumption for both locations. Additionally, a tradeoff between lowest cost and lowest energy consumption was identified for Sapporo. The results of this research could be applied to develop a more robust control on monovalent heat pump systems. (c) 2013 Elsevier Ltd. All rights reserved.
  • 給湯予熱を組み合わせた基礎杭利用型地中熱ヒートポンプシステムの運用改善
    若山 尚之, 長野 克則, 葛 隆生
    日本建築学会技術報告集, 19, 42, 645, 648, 日本建築学会, 2013年06月, [査読有り]
    日本語, 研究論文(学術雑誌), The subject of this paper is the heat source system with the Ground Source Heat Pump(GSHP) system in the PHC foundation piles. The thermal storage characteristics of the ground may be used to improve the GSHP system performance in this hospital by alternating the storing and restoring cycle on day-night basis in the summer season. The analysis during the commissioning shows the effectiveness of the GSHP system concept and improved system performance as a result of changing the operational condition.
  • Confirmation of the Sterilization Effect Using a High Concentration of Ozone Gas for the Bio-Cleanroom
    Takuji Iwamura, Katsunori Nagano, Toshihiro Nogami, Noritomo Matsuki, Noriyoshi Kosaka, Hideharu Shintani, Miyoshi Katoh
    BIOCONTROL SCIENCE, 18, 1, 9, 20, SOC ANTIBACTERIAL & ANTIFUNGAL AGENTS, JAPAN, 2013年03月, [査読有り]
    英語, 研究論文(学術雑誌), A high-level aseptic environment must be maintained in bio-cleanrooms used for the manufacture of sterile products. In the past, formaldehyde gas was most commonly used to sterilize bio-cleanrooms, but due to strict residual limitations there has been a need to develop a less toxic alternative choice. The authors have developed a revolutionary new sterilization system using a high concentration of ozone gas and used this system to sterilize an actual bio-cleanroom. This system integrates the ozone gas generator with the air conditioning system by proper control. The design specifications for the system included an ozone gas concentration of 200ppm or more, relative humidity of 80% or more, and a sterilizing time of 120min. Blow vents and suction ports were placed to ensure a uniform airflow which would extend through the entire room during ozone gas sterilization. Tests regarding long-term material exposure to ozone gas were conducted when the system was introduced to distinguish usable and unusable materials. In an actually constructed cleanroom, simulations were used to predict the evenness of the diffusion of ozone gas concentration and relative humidity during ozone gas sterilization, and measurements of the actual indoor ozone gas concentration, temperature and relative humidity during sterilization revealed that the ozone concentration and relative humidity needed for sterilization had been achieved generally throughout the entire environment. In addition, the CT value (mg/m(3)(=ppm) x min), derived by multiplying the ozone gas concentration during ozone gas sterilization by the sterilization time, was equal to or greater than the target value of 24 x 10(3) (ppm . min). When the results of sterilization in a cleanroom were confirmed using a biological indicator (BI), negative results were obtained at all measurement points, demonstrating that sterilization was being performed effectively in the actual factory at which the ozone gas sterilization system had been introduced.
  • 少水量対応地中熱ヒートポンプビルマルチシステムの開発に関する研究(第1報)システムの概要およびフィールド試験によるシステムの最適循環流量の検討
    中村 靖, 長野 克則, 葛 隆生
    日本建築学会環境系論文集, 78, 684, 165, 174, 日本建築学会, 2013年02月, [査読有り]
    日本語, 研究論文(学術雑誌), The summary of this report is shown as follows. These studies aim at development of a low flow circulation (LF) ground source heat pump (GSHP) multi-split system in order to reduce energy consumption of circulation pumps in the GSHP system. This system applies low flow circulation system in primary side and multi-split system in secondary side. This paper contributes Part 1 in the series of these studies. First, the system concept and development planning are introduced. Then verification test of operation reliability of a water source multi-split heat pump were carried out in the manufacturing factory. As the result, the authors confirmed heating operation reliability of the heat pump even on conditions of inlet temperature of 10 °C and low flow circulation in primary side of 30 L/min In addition, field test apparatus of the LF-GSHP system were constructed to investigate the optimum circulation flow rate of the LF-GSHP system and demonstrate the effect of reduction of circulation pumps' electric power consumption When the cooling output is around 14 kW, the maximum SCOP of 5.31 is obtained on the condition that the flow rate is 30 L/min On the other hand, the flow rate condition of 96 L/min provides the highest SCOP value of 3.78 in case where the cooling output is around 24-28 kW. These suggest that variable water volume (VWV) control of the circulation pump can reduce circulation pumps' electric power consumption the most.
  • Honeycomb filters made from mesoporous composite material for an open sorption thermal energy storage system to store low-temperature industrial waste heat
    Hongzhi Liu, Katsunori Nagano, Daichi Sugiyama, Junya Togawa, Makoto Nakamura
    International Journal of Heat and Mass Transfer, 65, 471, 480, 2013年, [査読有り]
    英語, 研究論文(学術雑誌), Today, a significant amount of low-temperature (<
    100 C) industrial waste heat is directly discharged to the atmosphere. In this study, a new mesoporous composite material was developed as a sorption thermal energy storage material by utilizing its sorption and desorption properties. The composite material was formed by adding calcium chloride (CaCl2) to a mesoporous ceramic honeycomb filter. The main component of this ceramic is Wakkanai siliceous shale (WSS), which is found in northern Japan. The material test results demonstrated the following: (1) the composite material can sorb more water than the original ceramic material without dropping the CaCl 2 solution
    (2) it can be regenerated at around 100 C
    and (3) after 25 repetitive regeneration/sorption cycles, no decomposition or cracks were observed. The sorption isotherm was also undamaged. An open sorption thermal energy storage system was proposed, and the experimental setup was constructed. A low regeneration temperature (80-100 C) of the storage medium was achieved with this open system. In the case of the 22.4 wt% CaCl2 supported with the honeycomb filter (926.2 g
    2 L), air was heated to a temperature greater than 40 C for a duration of 432 min by supplying air at 25 C at a flow rate of 3.0 m3/h when the regeneration temperature was 80 C. The volumetric heat storage density obtained was 272 MJ/m3, and the coefficient of the heat extraction performance during the heat release process was 65%. © 2013 Elsevier Ltd. All rights reserved.
  • 外国人留学生による日本語コミュニケーションにおける問題点と改善策
    柳町 智治, 長野 克則, 繪内 正道, 馬場 直志
    Journal of JSEE, 61, 4, 4_3, 4_7, Japanese Society for Engineering Education, 2013年, [査読有り]
    日本語, Using the framework of conversation analysis, this paper examines the communication problems which international graduate students in engineering encounter when they have a Q&A session in Japanese after giving a presentation. This analysis focuses on (1) the phenomenon where international students fail to initiate a 'repair sequence' (Schegloff et al. 1977) to attain mutual understanding among participants when they do not understand a question from the floor ; and (2) why the conversational procedure of 'repair' is not employed by these students. Finally, this paper discusses what kinds of classroom activities can be introduced to solve these students' communication problems. These issues are also applicable to situations in which native speakers of Japanese use English or other foreign languages in engineering communities.
  • Experimental study on a monovalent inverter-driven water-to-water heat pump with a desuperheater for low energy houses
    David L. Blanco, Katsunori Nagano, Masahiro Morimoto
    APPLIED THERMAL ENGINEERING, 50, 1, 826, 836, PERGAMON-ELSEVIER SCIENCE LTD, 2013年01月, [査読有り]
    英語, 研究論文(学術雑誌), In this study, a novel monovalent inverter-driven water-to-water heat pump with a desuperheater was developed. in this unique system, domestic hot water is produced at a constant temperature controlled by a variable flow rate and stored in a tank. The heat demand is constantly matched by the system through the use of an inverter-driven compressor, which eliminates the need for a buffer tank. Three heating configurations of the system were examined with respect to variable climate conditions and two space heating target temperatures: space heating (mode 1), domestic hot water production (mode 2) and a combination of both (mode 3). Mappings of the performance variables per frequency were constructed for mode 3. For the other modes, the highest COP was identified for each examined climate condition. The difference between modes I and 3 was less than 5% for every variable. The space heating target temperature had a strong influence on both modes, showing an average difference of 29% in the COP between 35 degrees C and 45 degrees C. Mode 2 exhibited a considerably reduced COP compared to the other modes, as well as the lowest refrigerant mass flow rate and highest compression ratio among the three modes. From the previous results and the examination of the compressor, the compression ratio presents itself as a key parameter that can help to increase the COP if maintained at low values. The results of this research could be applied to the design of a control methodology for monovalent heat pumps. (C) 2012 Elsevier Ltd. All rights reserved.
  • Heat transfer of a horizontal spiral heat exchanger under groundwater advection
    Huai Li, Katsunori Nagano, Yuanxiang Lai
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 55, 23-24, 6819, 6831, PERGAMON-ELSEVIER SCIENCE LTD, 2012年11月, [査読有り]
    英語, 研究論文(学術雑誌), Groundwater flows at approximately 1-3 m under the ground surface in a given region. If groundwater flow is present, the performance of a horizontal ground heat exchanger (HGHE), buried in a shallow trench, is enhanced. Nevertheless, owing to the general depth at which groundwater is present, research regarding the heat transfer of a ground heat exchanger (GHE) under conditions with groundwater flow has mainly focused on vertical GHE systems. To the authors' knowledge, no such studies have addressed HGHEs. From a system design perspective, a prediction tool is needed to consider the groundwater flow, optimize the size of the horizontal heat exchanger, minimize the initial cost and maximize the operational efficiency. Therefore, in this study, a moving ring source model was established and solved analytically to describe the temperature response of a spiral heat exchanger with groundwater flow. In addition, experiments were carried out to study the soil temperature variation during the operation of a spiral heater with different water velocities. The validity of the proposed model was proven by the good agreement between the experimental and calculated results. The average virtual tube surface temperature variations of single ring sources in two different configurations are discussed. Furthermore, the average virtual tube surface temperatures of multiple ring sources extending from single arrangements were computed and approximation algorithms were introduced to reduce the calculation time. The approximation approach has been proven to run thousands of times faster than the initial method, and the calculation results are in 97% agreement with those of the initial method. In summary, this study provides a useful tool for the design of spiral heat exchangers. (C) 2012 Elsevier Ltd. All rights reserved.
  • Steady state vapor compression refrigeration cycle simulation for a monovalent inverter-driven water-to-water heat pump with a desuperheater for low energy houses
    David L. Blanco, Katsunori Nagano, Masahiro Morimoto
    INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, 35, 7, 1833, 1847, ELSEVIER SCI LTD, 2012年11月, [査読有り]
    英語, 研究論文(学術雑誌), A steady-state simulation is presented for a monovalent inverter-driven water-to-water heat pump with a desuperheater. For design-oriented simulations, superheating or sub-cooling degrees are used as input. However, the proposed simulation only uses the system's refrigerant charge, environmental, and control parameters, which make it particularly useful for off-design evaluations, including the annual performance factor calculation. Block models were used for the compressor and electronic expansion valve, while novel adaptive zone models were used for the heat exchangers. A multivariable error minimization algorithm was used over a sequential component scheme to provide global convergence. The numerical calculations were compared with 118 experimental results. The resulting COP agrees within 10% for 95.77% of the data. The mapping results reveal a maximum COP deviation of 8.78%. Computational results for the studied system reveal that a constant degree of superheating might not always maximize the COP. (C) 2012 Elsevier Ltd and IIR. All rights reserved.
  • 屋外環境の垂直分布・異なる地表面が人体への熱ストレスに及ぼす影響(セッションG)
    栗原 浩平, 谷地 誠, 窪田 英樹, 濱田 靖弘, 中村 真人, 長野 克則
    人間-生活環境系シンポジウム報告集, 36, 269, 272, 人間-生活環境系学会, 2012年11月, [査読有り]
    日本語, 屋外における環境要素の垂直分布と地表面の性状が人体への熱ストレスに及ぼす影響を知ることを目的として,屋上と芝生・路上において諸量を実測し,日射作用温度・平均皮膚温を用いて評価した。まず,屋上において50,100,150cmの高さで気温・風速・グローブ温度を実測した結果,快晴日における50cm高さの日射作用温度が150cmよりも3℃程度高いことを明らかにした。また,環境グローブ温度を芝生と屋上・路上において同時に測定し当該場での日射作用温度と平均皮膚温を試算した。芝生における環境グローブ温度が最も低かったが,風速が他よりも低かったことにより結果的には路上や屋上とほぼ同じ値を示した。
  • 大樹の機能を模倣したエコスクールの計画 (バイオミミクリー概念の建築計画への適用)
    若山尚之, 葛隆生, 龍有二, 長野克則
    日本建築学会技術報告集, 18, 40, 999, 1002, 2012年10月, [査読有り]
    日本語, 研究論文(学術雑誌), This paper introduces an overview of Ohori high school building built on Mar. 2010. This building was designed as an environmental conscious school that mimics the functions of a big tree. Leaf transpiration for roof top water spray, absorbing heat from roots for the Ground Source Heat Pump system, and rain water retaining for rain water storage, etc. This paper shows the planning concept and design features of the environmental conscious building introducing the concept of biomimicry.
  • A new model and solutions for a spiral heat exchanger and its experimental validation
    Huai Li, Katsunori Nagano, Yuanxiang Lai
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 55, 15-16, 4404, 4414, PERGAMON-ELSEVIER SCIENCE LTD, 2012年07月, [査読有り]
    英語, 研究論文(学術雑誌), A spiral heat exchanger was applied in a ground source heat pump (GSHP) system that is primarily used for residential indoor heating. Studies that have been performed on the heat transfer of spiral heat exchanger have focused on field measurements and numerical analysis; however, theoretical research on the subject is absent in the literature. In this study, a methodology is proposed to analyze the heat performance of a spiral heat exchanger. A ring source model was established and solved analytically to describe the temperature variation of the ground caused by a spiral heat exchanger. The validity of the model was examined by an experiment on the soil temperature variation with a spiral heater. The virtual ring tube surface temperature response of unit ring circle was calculated by a superposition of the contributions of the ring source itself and adjacent ring sources. Furthermore, a fast algorithm was created to compute the average tube surface temperature resulting from the dimensionless temperature rise at a point far from the ring source that is constant when the non-dimensional distance is less than 0.13. The author confirmed that the calculation time of this proposed algorithm decreased by a factor of 100 compared with the traditional integration method. A system designer will find this algorithm helpful when determining the size of a heat exchanger under a required heating load, particularly for different arrangement of spiral heat exchangers. (C) 2012 Elsevier Ltd. All rights reserved.
  • クリーンルームのオゾンガス滅菌を目的としたオゾンガスに対する各種建築・設備材料の耐性評価
    岩村卓嗣, 長野克則, 若山恵英, 小阪教由, 野上俊宏, 新谷英晴, 加藤美好
    防菌防ばい, 40, 6, 333, 340, 日本防菌防黴学会, 2012年06月, [査読有り]
    日本語
  • 稚内層珪質頁岩を用いたデシカント空調の開発―第4報:デシカント空調機の運転条件に関する実験と検討―
    鍋島佑基, 長野克則, 中村真人, 外川純也
    日本冷凍空調学会論文集, 29, 1, 171, 178, Japan Society of Refrigerating and Air Conditioning Engineers, 2012年03月, [査読有り]
    日本語, The objective of this study is to develop a desiccant system using Wakkanai siliceous shale (WSS). This article is the 4th report of the series. Two honeycombed desiccant rotors containing WSS powder with chlorides impregnated was made and evaluated. These rotors were applied into the test desiccant apparatus. It has an additional sensible heat exchange rotor (SHE). To regenerate the first rotor, hot water at 40 ℃ was supplied to HEX. In addition, cold water at 23 ℃ was provided to HEX for pre-cooling the second rotor. The amount of dehumidification was 5.7 g/kgDA at 1-1 rpm operation, and the condition of air temperature and humidity of the outside and room were 30 ℃, 75 %RH and 26 ℃ and 60 %RH respectively. (1-1 rpm: rotating speed of the first - second rotors) Though the amount of dehumidification didnt increase according to equipping a SHE rotor, we found that it was effective to reduce a used thermal energy for pre-cooling. As the result, the maximum dehumidification of 6.5 g/kgDA was obtained at 1-4rpm of first and second rotors with additional pre-cooling for outside air. This was 86 %RH of the latent cooling load between OA and RA.
  • 稚内層珪質頁岩を用いたデシカント空調の開発―第3報:デシカントローターの除湿性能評価―
    外川純也, 鍋島佑基, 長野克則
    日本冷凍空調学会論文集, 29, 1, 163, 170, Japan Society of Refrigerating and Air Conditioning Engineers, 2012年03月, [査読有り]
    日本語, This article is the 3rd report of the series. The objective of this study is to evaluate the dehumidification amount of newly developed desiccant rotors by using paper containing Wakkanai siliceous shale (WSS) which is a natural mesoporous material in Hokkaido. The dehumidification amounts were evaluated at the following air conditions (OA: 30 ºC, 75 %RH, RA: 40 ºC, 27.3 %RH). The WSS rotor and a B type silica gel rotor (400 mm of the rotor diameter and 200 cpsi of the rotor cell numbers) showed same values of 3.1 and 3.2 g/kgDA at 1 rpm of rotation speed, even though the maximum water adsorption amount of the B-type silica gel is three times higher than that of the WSS. To enhance the dehumidification ability of the WSS rotor, an impregnation of NaCl and MgCl2 into the WSS paper was carried out, and it gave more than 3.8 g/kgDA. In addition, for the development of the compact desiccant system, dependency of the rotor rotation speed, the size of the rotor diameter, and a rotor cells number were examined. Finally, 4.7 g/kgDA was obtained at 500 mm diameter and 270 cpsi of the rotor cell numbers.
  • 稚内層珪質頁岩を用いたデシカント空調の開発―第5報:ローター形状と除湿量の検討―
    鍋島佑基, 長野克則, 外川純也
    日本冷凍空調学会論文集, 29, 1, 179, 186, Japan Society of Refrigerating and Air Conditioning Engineers, 2012年03月, [査読有り]
    日本語, The objective of this study is to develop a desiccant system using Wakkanai Siliceous Shale (WSS). This article is the 5th report of the series. In the first part of this paper, various parameters of the WSS rotor were estimated by the numerical calculation to find the higher dehumidification amount. An optimal rotor configuration was selected as 500 mmφ of the rotor diameter, 60 mm of the rotor thickness and 270 cpsi of the rotor cell number. In the second part, as a calculation model for the desiccant ventilation, an appropriate system, which consists of two rotors with two heat exchangers for pre-cooling and two heat exchangers for regeneration, was applied. To get over the target value of the dehumidification amount (7.6 g/kgDA), the numerical simulation was carried out based on the desiccant ventilation model. As a result, the maximum dehumidification amount of 8.6 g/kgDA was obtained at 0.5 rpm of each rotor rotating speed.
  • 稚内層珪質頁岩を用いたデシカント空調機の開発―第6報:除湿空調を行うシステム要件の検討―
    福島洋輝, 長野克則, 鍋島佑基, 中村真人, 外川純也
    日本冷凍空調学会論文集, 29, 1, 187, 194, Japan Society of Refrigerating and Air Conditioning Engineers, 2012年03月, [査読有り]
    日本語, This study aims to develop and evaluate a desiccant ventilation system using desiccant rotors of the Wakkanai siliceous shale (WSS). The desiccant apparatus consists of two WSS rotors, two heat exchangers for regeneration and two heat exchangers for pre-cooling. The target for the system is to remove all of latent heat load from outside air (7.6 g/kgDA) without condensing. In the experiments, when 40 ℃ water supplied to one of the heat exchanger for regeneration, condensation was inevitable in heat exchangers for pre-cooling. The condition to dehumidify 7.6 g/kgDA without condensation was to run two rotors at 0.5 rpm and to supply 21.5 ℃ water to heat exchangers for pre-cooling and 45 ℃ water to another two for regeneration. Under the condition, enthalpy needed to dehumidify was reduced by 18 % compared to conventional dehumidification.
  • Improvement of water vapor adsorption ability of natural mesoporous material by impregnating with chloride salts for development of a new desiccant filter
    Saya Nakabayashi, Katsunori Nagano, Makoto Nakamura, Junya Togawa, Asami Kurokawa
    ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY, 17, 4, 675, 686, SPRINGER, 2011年08月, [査読有り]
    英語, 研究論文(学術雑誌), The aim of this study is the development of a new adsorbent for the desiccant material which can be regenerated by the domestic exhaust heat by using natural mesoporous material, Wakkanai siliceous shale. To improve this shale's performance to adsorb/desorb the water vapor, lithium chloride, calcium chloride or sodium chloride was supported into the mesopores by impregnating with each chloride solution. Especially sodium chloride was effective to increase the water vapor adsorption amount 5-7 times of that of natural shale in the relative humidity range from 50 to 70%. Moreover, the appropriate impregnating concentrations were determined as 5wt% from the relationship between the maximum water vapor adsorption amount and the mesopore volume. Based on these results, a new desiccant filter has been developed by impregnated original paper with lithium chloride and sodium chloride. This paper contained shale powder in the synthetic fibers. The dehumidification performance of this filter was evaluated under the simulated summer condition in Tokyo. From the cyclic adsorption/regeneration test, this shale and chlorides filter could adsorb and desorb 60 g/h water vapor repeatedly at the regeneration temperature of 40A degrees C. On the other hand, a silica gel filter and a zeolite filter adsorbed and desorbed only 10 g/h and 25 g/h, respectively. These results suggested that the shale impregnated with the chlorides has the best dehumidification ability as a new desiccant material. Further, the desiccant filter made from the shale will achieve the effective use of the low temperature exhaust heat.
  • Effect of the wetness of clothing made of different materials on the mean skin temperature in a hot environment               
    KUWABARA Kouhei, KUBOTA Hideki, HAMADA Yasuhiro, NAGANO Katsunori
    Book of Abstracts of 14th International Conference on Environmental Ergonomics, 293, 296, 2011年07月, [査読有り]
    英語, 研究論文(国際会議プロシーディングス)
  • 地中熱利用に対応できる水冷式冷暖房・給湯ヒートポンプユニットの開発
    伊藤 康之, 長野 克則
    日本建築学会技術報告集, 17, 36, 593, 596, 日本建築学会, 2011年06月, [査読有り]
    日本語, 研究論文(学術雑誌), We developed ground source heat pump unit that was capable of air-conditioners and hot water supply. This equipment utilized artificial waste heat generated by air-conditioners as the heat source for hot water supply. By carrying out a simulation, it was found that the air-conditioning system had high performance. As result, this system could reduce CO2 emissions.
  • 地中熱ヒートポンプシステムにおける地中熱交換器仕様の設計方法に関する研究(その1)地中熱交換器の採放熱量の定量化とその応用
    葛 隆生, 長野 克則, 中村 靖
    日本建築学会環境系論文集, 76, 659, 59, 66, 日本建築学会, 2011年, [査読有り]
    日本語, 研究論文(学術雑誌), In this paper, the authors define the heat extraction or injection rate of ground heat exchanger (GHEX) per length and temperature difference as the coefficient of heat extraction or injection. Applying the definition, the heat extraction or injection performances of GHEXs are quantified corresponding to the conditions such as ground properties and GHEXs' specifications are changed.In addition, the authors compared to the quantified heat extraction or injection performances. When the flow condition of heat transfer medium in GHEX turns from laminar flow to turbulent flow, the heat extraction or injection performances of GHEXs increase 5~12%. On the other hand, the increase of heat extraction or injection performances of GHEXs in the range of turbulent flow is only less than 2% even in the where the flow rate is up to more than thrice. When the number of U-tubes is two and flow rate per the one U-tube is set at 6 L/min, the ratios of heat extraction performance of GHEXs using pre-casting concrete pile and steel pile compared to the borehole GHEX are 1.35∼ 1.58 and 1.29∼1.40, respectively.
  • 塩化物を担持させた稚内層珪質頁岩の吸湿メカニズムの評価
    黒川 麻美, 外川 純也, 鍋島 佑基, 長野 克則
    化学工学論文集 = Kagaku kogaku ronbunshu, 37, 5, 394, 399, 化学工学会, 2011年, [査読有り]
    日本語, 研究論文(学術雑誌), Wakkanai siliceous shale (WSS) is a natural mesoporous material that has high performance of moisture adsorption/desorption in response to relative humidity. The authors have previously applied the technique of impregnation with chloride to enhance the water adsorption performance; and in the present study the moisture sorption mechanism with chloride impregnation was examined by DSC analysis. It was found that the adsorbed water in the pores was divided present in three forms: non-freezing water, freezable bound water and free water. The free water peak was not observed at water content below 320 mg/g. This water content was also consistent with the maximum amount of water adsorbed without surface wetting, which was estimated from color change of WSS surface at various water contents. In addition, from the measurement by a modified nitrogen adsorption method, it was visually shown that the mechanism of moisture sorption gradually proceeded from the smaller mesopores. Moreover, the NaCl impregnation was applied to other porous materials. From the experimental results, the impregnation of silica gel with NaCl is not effective, because of the structural weakness. Therefore the stability of the material to impregnation is an important factor.
  • 多孔質材料の細孔内の吸着水分布に関する新規測定法
    黒川 麻美, 外川 純也, 鍋島 佑基, 長野 克則
    化学工学論文集 = Kagaku kogaku ronbunshu, 37, 6, 506, 511, 化学工学会, 2011年, [査読有り]
    日本語, 研究論文(学術雑誌), Moisture absorption by porous materials with mesopores and micropores is generally evaluated by measurement of the water adsorption isotherm and analysis of the pore distribution by the nitrogen adsorption method using completely dry samples. In practical use, however, the adsorbent contains some water depending on the environmental conditions. To evaluate the pore distribution accompanied by the water adsorption, the nitrogen adsorption method was modified by using a frozen sample, which was dipped into liquid nitrogen after the water adsorption had reached equilibrium. Water adsorption was found to proceed from the smaller to the larger pores as relative humidity increased. The pore distribution at the relative humidity above which pores were completely occupied by absorbed water was shown visually on a histogram.
  • 天然多孔質材料を用いた除湿フィルターの開発
    中林 沙耶, 長野 克則, 中村 真人
    日本建築学会技術報告集, 16, 34, 1023, 1026, 日本建築学会, 2010年10月, [査読有り]
    日本語, 研究論文(学術雑誌), A new dehumidification filter using natural mesoporous material, Wakkanai siliceous shale, was developed for effective treatment of the latent heat load. The dehumidification ability of the developed filter was evaluated. It was demonstrated that this filter performed as an air-toair heat exchanger under high rotating speed. The total heat exchange efficiency was 80% at 22 rpm. This filter removed 3.3 g/kg DA of water vapor at 1 rpm when the regeneration temperature was 40°c. Moreover the rate of energy reduction to remove outdoor air load was estimated to be 56% by a combination of this filter and a sensible heat exchanger.
  • パッシブ型水素吸放出システムにおける水素吸蔵合金層の有効熱伝導率に関する研究
    白土 博康, 濱田 靖弘, 須田 孝徳, 岡 喜秋, 長野 克則
    日本冷凍空調学会論文集, 27, 2, 67, 74, 日本冷凍空調学会, 2010年06月, [査読有り]
    日本語,   This paper indicates the effective thermal conductivity of the hydrogen absorbing alloys bed of the passive type hydrogen storing systems for residential energy systems or stand-alone power supplies by experimental measurement.
      The effective thermal conductivity of the alloys bed depended on the cylinder pressure and the H/M composition of the alloys. Moreover, the conductivity was linear to the H/M composition at Plateau area.
      The introduction of 15 mass% Cu wires to the bed for improving the heat transfer was effective to raise the effective thermal conductivity of the bed. 50% of void fraction of the bed was also useful. The use of MmNi5 resulted in raising the effective thermal conductivity compared to the use of MmNi4.50Co0.10Al0.15Mn0.25 at the same H/M composition and the void fraction.
  • 水蓄熱と組み合わせた躯体蓄熱空調システムのエネルギー評価に関する研究
    中村 卓司, 長野 克則, 金田一 清香
    日本建築学会環境系論文集, 75, 649, 289, 295, 日本建築学会, 2010年03月, [査読有り]
    日本語, 研究論文(学術雑誌), In this paper the energy characteristics of the building thermal mass storage system with the chilled water storage system is evaluated. A typical commercial building model is simulated by a computer and the influence of the regions, the daily weather and the heat load in the room is examined. The results show that the increase rate of the cooling load and the electricity consumption is high in the months of the low cooling load comparing with the non-storage case. And the building thermal mass storage system with the water storage reduces the primal energy consumption by 2.7% and the exhaust carbon dioxide by 10.4% in the optimized case in Tokyo.
  • 表面濡れ度合いの評価および最大吸湿量と細孔容積の関係による稚内層珪質頁岩の上限塩化物含浸水溶液濃度の決定
    中林 沙耶, 長野 克則, 外川 純也, 中村 真人, 黒川 麻美
    化学工学論文集, 36, 5, 480, 485, 化学工学会, 2010年, [査読有り]
    日本語, 研究論文(学術雑誌), 稚内層珪質頁岩は北海道宗谷地方に豊富に賦存する天然のメソポーラス材料であり,特に相対湿度70%以上で大きな吸放湿量が得られ,最大吸着量は270 mg/gに達する.その吸湿能力の向上を目的として塩化物の水溶液に含浸させ細孔内に担持させた場合,担持量が過剰だと高湿度下で吸着水,担持物質が潮解して生じた水溶液が細孔から溶出し,表面が濡れた状態になってしまうという問題がある.そこで高湿環境曝露後の試料表面のRGB色調解析により求める濡れ度合いの評価により,表面濡れを生じない担持量となる上限含浸水溶液濃度を定めた.塩化リチウムの上限濃度は4 wt%,塩化カルシウムは5 wt%となった.また,上限含浸水溶液濃度でそれぞれの塩化物を担持させた珪質頁岩の最大吸湿量は,窒素ガス吸着法で求められるメソ孔の容積から仮定する保持可能な吸湿量とほぼ一致していることがわかった.試料表面の濡れを生じさせないためには,最大吸湿時の吸着水体積を細孔直径50 nm以下のメソ孔容積以下に留めることが効果的であることが示された.
  • 稚内層珪質頁岩を用いたデシカント空調の開発―第1報:デシカントローター用紙基材の開発と性能評価―
    外川純也, 黒川麻美, 中林沙耶, 長野克則, 吉田繁夫
    日本冷凍空調学会論文集, 26, 4, 543, 550, 日本冷凍空調学会, 2009年12月, [査読有り]
    日本語
  • 稚内層珪質頁岩を用いたデシカント空調の開発―第2報:ローターの開発と性能評価および数値解析―
    中林沙耶, 長野克則, 中村真人, 外川純也, 黒川麻美
    日本冷凍空調学会論文集, 26, 4, 551, 558, 2009年12月, [査読有り]
    日本語
  • 塩化物を担持させた稚内層珪質頁岩の水蒸気吸着性能評価
    中林 沙耶, 長野 克則, 中村 真人, 外川 純也, 黒川 麻美
    化学工学論文集, 35, 6, 602, 607, 化学工学会, 2009年11月, [査読有り]
    日本語, 研究論文(学術雑誌), Wakkanai siliceous shale (WSS) is a natural meso-porous material. This study aimed to improve its capacity to adsorb humidity. The shale's surface was supported by chlorides by being dried at 150 degrees C after impregnation with a chloride solution. The change in specific surface area, pore size distribution and the water sorption/desorption isotherm of the supported shales were investigated. From the water sorption isotherms, the amount of water sorption of WSS supported by LiCl 10% solution increased to 150 mg/g, while that of the natural WSS was 25 mg/g in the range of relative humidity from 30 to 60%. Similarly, WSS supported by NaCl adsorbed water about 7 times more water than natural WSS did. It was suggested that this improvement resulted from water transport into NaCl caused by capillary condensation of water in the WSS pores.
  • 地中熱ヒートポンプシステムの全電化熱源における最適運転モードに関する研究―病院における実施例―
    若山尚之, 長野克則, 金田一清香
    日本建築学会技術報告集, 15, 31, 823, 826, 2009年10月, [査読有り]
    日本語, 研究論文(学術雑誌), This paper indicates a heat source system which is installed in a totally electrified hospital built in April 2008. The heat source system consists of a high efficient screw type heat pump chiller with ice storage and another module type air cooled heat pumps. A ground source heat pump system is also introduced by using the foundation piles as ground heat exchangers. In this paper, seasonal and daily operation modes of the system are investigated. Measures for high efficient operation and energy saving in the whole system are finally proposed.
  • Calculation algorithm of the temperatures for pipe arrangement of multiple ground heat exchangers
    Takao Katsura, Katsunori Nagano, Shigeaki Narita, Sayaka Takeda, Yasushi Nakamura, Atsushi Okamoto
    APPLIED THERMAL ENGINEERING, 29, 5-6, 906, 919, PERGAMON-ELSEVIER SCIENCE LTD, 2009年04月, [査読有り]
    英語, 研究論文(学術雑誌), The authors introduce calculation algorithm of the temperatures of the ground and heat carrier fluid in multiple ground heat exchangers for pipe arrangement of ground source heat pump (GSHP) systems. First, the outline is explained. Next, in order to investigate possibility for the operation of the GSHP system with steel foundation piles and validate reproducibility of the value calculated by the design tool including the calculation algorithm, field tests of heating and heat extraction were conducted with a residential GSHP system using 25 steel foundation piles of 8 m long as ground heat exchangers. From a result of comparison between temperatures of the measurement in the test and calculation by using the design tool, it was confirmed that the tool could predict the temperatures with acceptable precision and speed for utilizing as a design tool. In addition, performance of GSHP systems with steel foundation piles in long term is predicted with the design tool. In moderate climate region, since the GSHP systems using multiple ground heat exchangers with short length can operate with high efficiency as well as the GSHP system using a single ground heat exchanger with long length, the GSHP systems with steel foundation piles have possibility to become popular. (C) 2008 Elsevier Ltd, All rights reserved.
  • Experimental study of the performance of porous materials to moderate the roof surface temperature by its evaporative cooling effect
    Surakha Wanphen, Katsunori Nagano
    BUILDING AND ENVIRONMENT, 44, 2, 338, 351, PERGAMON-ELSEVIER SCIENCE LTD, 2009年02月, [査読有り]
    英語, 研究論文(学術雑誌), The change of urban surfaces from permeable to impermeable materials, i.e. asphalt or concrete, has caused the rising of surface temperatures, particularly in densely developed cities. The consequences of this problem lead to higher energy consumption, especially for cooling purposes and other environment related issues. This paper aims to investigate the performance of several non-porous and porous potential roofing materials, to determine which ones might best be used to create a more effective system by utilizing their moisture absorption and evaporation capabilities. Here, four kinds of materials-pebbles, silica sand, volcanic ash, and siliceous shale-were tested to evaluate their moisture and thermal performance, including the effects from different particle sizes. First, the necessary physical properties and pore characteristics were obtained. Thus, each material, under simple boundary conditions, was evaluated in an evaporation experiment, to determine comparative moisture and thermal behavior. Next, cyclic experimentation was conducted, in which variations of temperature, relative humidity and simulated solar radiation were included. The measurement results showed that porous materials can satisfactorily lower surface temperature. Among the tested samples, siliceous shale of both small and large particle diameter was found to lower the daily average surface temperature by up to 6.8 and 8.6 degrees C, respectively. The better performance of large size particles could possibly be caused by the ventilation occurring within the material layers and high solar penetration through the large gaps between particles, which would release more latent heat when compared to materials of smaller particle size. Finally, analysis of surface energy balance suggested that water contents, solar absorptivity, and wind effects all have significant influences on cooling the surface temperature. (C) 2008 Elsevier Ltd. All rights reserved.
  • 躯体蓄熱システムにおける建築部位毎の蓄放熱量の解明と蓄熱効率に関する実験
    中村卓司, 川島実, 長野克則
    日本建築学会技術報告集, 15, 29, 173, 178, 2009年02月, [査読有り]
    日本語, 研究論文(学術雑誌), A series of experiment for building thermal mass storage system was carried out using the real-scale experiment unit which can reproduce the real condition. The experimental condition varies direction of blowing, flow rate, installation density of diffuser and flow temperature in order to clarify their characteristics of charging and discharging thermal storage into the slab. The result shows that the rate of charge to the building materials including slab is between 70% from 80%. And uniformity of supply air blowing is effective for charging to the slab.
  • 6-4-4 稚内層珪質頁岩を用いた低温排熱利用小型デシカント空調システムの開発(6-4 分散システム要素技術・開発,Session 6 省エネルギー,研究発表)
    中林 沙耶, 長野 克則, 中村 真人, 外川 純也, 黒川 麻美, 吉田 繁夫, 馬渕 勇人, 仁木 康介, 岡本 淳
    日本エネルギー学会大会講演要旨集, 18, 360, 361, 一般社団法人日本エネルギー学会, 2009年
    日本語, This study aims at the development of the heat pump system in a small size for effective cooling, heating, and hot water supply combined with the desiccant ventilation system using a natural porous material of Wakkanai siliceous shale. The new desiccant material using a natural porous material could be regenerated with the exhaust heat from the heat pump.
  • 稚内層珪質頁岩を用いたデシカント空調の開発―第1報:デシカントローター用紙基材の開発と性能評価―:第1報:デシカントローター用紙基材の開発と性能評価
    外川 純也, 黒川 麻美, 中林 沙耶, 長野 克則, 吉田 繁夫
    日本冷凍空調学会論文集, 26, 4, 543, 550, 公益社団法人 日本冷凍空調学会, 2009年, [査読有り]
    日本語
  • 稚内層珪質頁岩を用いたデシカント空調の開発―第2報:ローターの開発と性能評価および数値解析―:第2報:ローターの開発と性能評価および数値解析
    中林 沙耶, 長野 克則, 中村 真人, 外川 純也, 黒川 麻美
    日本冷凍空調学会論文集, 26, 4, 551, 558, 公益社団法人 日本冷凍空調学会, 2009年, [査読有り]
    日本語, The aim of this study is to develop a desiccant system using Wakkanai siliceous shale. A honeycombed desiccant rotor containing this shale's powder and chlorides was made and evaluated. However a specific surface area and a pore volume were smaller than a silica-gel rotor or a zeolite rotor, the maximum amount of water adsorption was twice as other rotors. We have verified the function of this desiccant rotor concerning adsorption and desorption of moisture from the draft experiments. The rotor containing the shale could adsorb moisture stably in the cyclic test, and be regenerated by 40°C air under this experimental condition. This means that the exhaust heat from the heat pump can be used for regenerating rotor. Furthermore, the numerical simulation was carried out on the assumption that this rotor was used for a dehumidification for the residential air conditioning in Tokyo. This rotor could adsorb 37.1% moisture of the required dehumidification amount for the hottest day in 2008. When we employed a pre-cooling before dehumidification, the amount of adsorption increased to 66.2%.
  • Method of calculation of the ground temperature for multiple ground heat exchangers
    Takao Katsura, Katsunori Nagano, Sayaka Takeda
    APPLIED THERMAL ENGINEERING, 28, 14-15, 1995, 2004, PERGAMON-ELSEVIER SCIENCE LTD, 2008年10月, [査読有り]
    英語, 研究論文(学術雑誌), In this paper, the authors propose a method of calculation of the ground temperature for heat extraction or injection via multiple ground heat exchangers. First, a high-speed algorithm to calculate the ground temperature is described. Next, a variation of the ground temperature calculated by using this method is compared with the one obtained by applying spatial superposition principle of the temperature responses calculated by the theoretical equations. As a result, the method's preciseness was proved and the computation time was about 1/135 compared to the method with the theoretical solution. From these, it was shown that the method has appropriate precision and computational speed to use as a design tool. Additionally, if the ground heat exchangers are short such as when foundation piles of a building are used as ground heat exchangers, it is necessary to consider the heat transfer from the edge of the ground heat exchangers. Thus we devised a method, which uses the equivalent radius obtained by multiplying the ideal ground heat exchanger radius by a modification coefficient, to obtain the average surface temperature of the ground heat exchangers influenced by the heat transfer. The temperature calculated with the modification coefficient was compared to the one calculated without the modification coefficient. (C) 2007 Elsevier Ltd. All rights reserved.
  • F-32 熱中症の予防等暑熱環境評価のための体温予測モデル : (第7報) 平均皮膚温と酸素摂取水準(%VO_<2max>)を用いた心拍数,体内温度の予測
    雨宮 智史, 桑原 浩平, 窪田 英樹, 濱田 靖弘, 中村 真人, 長野 克則, 池田 光毅
    学術講演会論文集, 20, 2, 1181, 1184, 社団法人空気調和・衛生工学会, 2008年08月08日
    日本語, We propose a new model for predicting heart rate and core temperature in hot environment considering individual cardiorespiratory capacity by applying our human model for predicting mean skin temperature. Core temperature as well as heart rate is defined as the function of exercise intensity and thermal stress expressed by deviation of mean skin temperature from that of thermal neutrality. Core temperature and heart rate begin to increase at a critical mean skin temperature; we have identified these critical values by using data from our experiments and literatures.
  • 躯体蓄熱システムにおける蓄熱特性の評価に関する実験的研究
    中村 卓司, 長野 克則
    日本建築学会環境系論文集, 73, 627, 639, 645, 一般社団法人日本建築学会, 2008年05月, [査読有り]
    日本語, 研究論文(学術雑誌), The real-scale experimental unit of HVAC system using building thermal mass storage for a commercial building was constructed and a series of experiment was carried out. The experimental condition varies direction of blowing, flow rate and density of diffuser in order to clarify their influence to the amount of charging energy into the slab. And the thermal storage capacity was analyzed making unit by differential of initial concrete slab temperature and blowing temperature. The result shows that the unit thermal storage capacity was proper, and the unit thermal storage capacity of horizontal blowing is larger than from 1.4 times to 1.9 times as vertical blowing.
  • 寒冷地における家庭用コージェネレーションシステムの現状評価と将来性に関する研究
    濱田靖弘, 田篭秀俊, 長野克則, 後藤隆一郎, 中村充
    太陽エネルギー, 34, 3, 51, 58, 2008年05月, [査読有り]
    日本語
  • 地下水流れを有する砂槽内採放熱実証実験
    葛 隆生, 長野 克則, 武田 清香, 中村 靖
    空気調和・衛生工学会論文集, 32, 127, 1, 9, 社団法人空気調和・衛生工学会, 2007年10月, [査読有り]
    日本語, 地下水流れによる採放熱量の増大効果を定量的に把握するため、砂槽内に模擬地下水を発生させることが可能な鋼製タンクを地中に埋設し、砂槽内に設置した地中熱交換器により採放熱実験を行った。まず、種々の地中熱交換器において、地下水流れ場の採放熱量増大効果を定量的に把握するための方法を示し、採放熱試験の結果から地下水流速の増大に応じて採熱量が増大することを確認した。さらに、Uチューブ型を使用した場合について、これまでの実証実験では明らかにされてこなかった地下水流速の比較的小さいu_=100〜350m/年の範囲においても1.2〜1.4倍程度の採放熱量増大効果があることを確認した。また、地下水流れが1400m/年程度の卓越した地盤において、二重管型の地中熱交換器を使用した際の長さ・温度差あたりの採熱量が16.12W/(m・K)と、Uチューブ型を使用した場合の3倍以上となった。これより、地下水流れが非常に大きい場合には、熱抵抗の小さい地中熱交換器を選択すると非常に大きい採熱量が得られることがわかった。採熱量について実測値が強制対流のみを考慮した計算値よりも大きくなるという結果となり、自然対流の影響も現れていることが示唆されたため、これについて考察を行った。
  • 発電システムを備えた省エネルギー住宅のエクセルギー経済評価(その1)―エクセルギー負荷とエクセルギー単価の算出方法―
    太田勇, 長野克則
    太陽エネルギー, 33, 5, 51, 59, 日本太陽エネルギー学会, 2007年09月, [査読有り]
    日本語
  • 発電システムを備えた省エネルギー住宅のエクセルギー経済評価(その2)―モデル住宅のエクセルギー経済評価―
    太田勇, 長野克則
    太陽エネルギー, 33, 5, 61, 67, 2007年09月, [査読有り]
    日本語
  • F-39 熱中症の予防等暑熱環境評価のための体温予測モデル : (第5報) 有色グローブ温度計による"日射作用温度"の測定と人体平均皮温の予測
    桑原 浩平, 中谷 則天, 窪田 英樹, 濱田 靖弘, 中村 真人, 雨宮 智史, 長野 克則
    学術講演会論文集, 19, 2, 1287, 1290, 社団法人空気調和・衛生工学会, 2007年08月24日
    日本語, The aim of this research is to protect workers and exercising people from heat disorders by predicting body temperatures (both core and mean skin temperature) and sweating rate of human. In this paper, we have proposed a method for predicting "solar operative temperature" with black and white globe thermometers, and measured solar absorptance of white globe. The predicted mean skin temperature applied solar operative temperature which was obtained with globe temperatures has agreed well with those obtained from human experiments conducted outdoors.
  • Study of a floor supply air conditioning system using granular phase change material to augment building mass thermal storage - Heat response in small scale experiments
    K Nagano, S Takeda, T Mochida, K Shimakura, T Nakamura
    ENERGY AND BUILDINGS, 38, 5, 436, 446, ELSEVIER SCIENCE SA, 2006年05月, [査読有り]
    英語, 研究論文(学術雑誌), We have proposed a new floor supply air conditioning system, using phase change material to augment building mass thermal storage. A scale model was constructed for such a system. Granules containing phase change material (PCM), with a phase change temperature of about 20 degrees C, were made from foamed glass beads and paraffin waxes. Results from measurements simulating an air conditioning schedule in office buildings indicate that 89% of daily cooling load could be stored each night in a system that used a 30 mm thick packed bed of the granular PCM. (c) 2005 Elsevier B.V. All rights reserved.
  • 屋根全面太陽光発電システムを設けた省エネルギー住宅の環境評価
    太田勇, 長野克則
    太陽エネルギー, 32, 2, 53, 61, 日本太陽エネルギー学会, 2006年03月31日, [査読有り]
    日本語
  • Characteristics and consideration of required sweat rate standard of the previous ISO 7933
    T. Sakoi, T. Mochida, K.Nagano, K. Shimakura
    Journal of the Human-Environment System, 9, 1, 19-29, 2006年, [査読有り]
  • Experiments to determine the convective heat transfer coefficient of a thermal manikin
    K Kuwabara, T Mochida, K Nagano, K Shimakura
    Environmental Ergonomics, 3, 423, 429, ELSEVIER SCIENCE BV, 2005年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), In order to determine an equation for calculating the convective heat transfer coefficient in humans, that can be used in an outdoor environment, experiments using a thermal manikin were carried out at an air velocity in the range of 0.7-4.7 m/s. The convective heat transfer coefficient of the naked human body almost agreed with that of the clothed human body with two clothing ensembles. Empirical formulae of the convective heat transfer coefficient for the whole and 10 parts of the body were calculated using experimental data at an air velocity in the range of 0.1-1.0 m/s, which are applicable formulae at an air velocity in the range of 0.1-4.7 m/s. The thermal insulation of the two clothing ensembles decreased with increasing air velocity.
  • Effective radiant temperature including solar radiation
    K Kuwabara, T Mochida, K Nagano, K Shimakura
    Environmental Ergonomics, 3, 257, 262, ELSEVIER SCIENCE BV, 2005年, [査読有り]
    英語, 研究論文(国際会議プロシーディングス), An evaluation method for thermal sensations of the human body in an outdoor thermal environment was developed. Effective radiant temperature was proposed as the mean radiant temperature in an outdoor environment. The operative temperature and standard new effective temperature, SET*, in outdoor environments could be calculated using the effective radiant temperature. In order to examine the operative temperature and SET* based on the effective radiant temperature, experiments using subjects were carried out in an outdoor environment at Sapporo city. The SET* calculated from experimental data correlated well with the thermal sensation votes of the subjects. It was shown that a SET* based on the effective radiant temperature can evaluate the thermal sensation of the human body in an outdoor environment.
  • 粒状潜熱蓄熱材を適用した躯体蓄熱床吹出し空調システムに関する研究 その3 マイクロカプセルペレットPCMの適用と室内温熱環境の評価
    武田清香, 長野克則, 持田徹, 中村卓司
    日本建築学会環境系論文集, 70, 587, 29, 35, 日本建築学会, 2005年01月, [査読有り]
    日本語, Flocculated micro-capsule pellet phase change material (FMC-PCM) which has high latent heat amount is used to the floor supply air conditioning system with thermal energy storage for building structure during night. The load shifting effect can be determined by temperature conditions in the nighttime and daytime. The effect of radiation from the floor face allows the set temperature to be increased to 28℃ by using a FMC-PCM which shows phase change around 20 to 23℃. Thermal sensation indexes indicate the comfortable sensation under a condition with it. The use of the FMC-PCM also effects the improvement of the uncomfortable coldness in the morning in usual systems.
  • Thermal characteristics of a direct heat exchange system between granules with phase change material and air
    K Nagano, S Takeda, T Mochida, K Shimakura
    APPLIED THERMAL ENGINEERING, 24, 14-15, 2131, 2144, PERGAMON-ELSEVIER SCIENCE LTD, 2004年10月, [査読有り]
    英語, 研究論文(学術雑誌), The authors have proposed a system of direct heat exchange between granules including phase change material (PCM) and air. The PCM granules consist of granulated porous media with particle diameters of about 1-3 mm and paraffin wax. At first, column experiments are performed with a packed bed of PCM granules. Temperature variations in the PCM packed bed are measured. It is demonstrated that heat exchange flux between the PCM granules and air can be kept large and continuous during phase change. Secondly, a computer simulation model is made using an assumption that the temperature of the PCM granules is the same as that of passing air throughout the packed bed. It is found the phase change period calculated by the model is in agreement with the measured one. Finally, heat transfer coefficient during phase change and the time required for phase change to be completed in the system are discussed by a numerical analysis. (C) 2004 Elsevier Ltd. All rights reserved.
  • 粒状潜熱蓄熱材を適用した躯体蓄熱床吹出し空調システムに関する研究 その2 システムのモデル化と空調機負荷の夜間移行効果
    武田清香, 長野克則, 持田徹, 中村卓司
    日本建築学会環境系論文集, 584, 584, 47, 52, 2004年10月, [査読有り]
    日本語
  • 国土数値情報を用いた地下帯水層蓄熱システムの導入可能性に関する研究
    浜田靖弘, 中村真人, 窪田英樹, 丸谷薫, 淵上栄樹, 長野克則, 落藤澄
    太陽エネルギー, 30, 5, 57, 63, 日本太陽エネルギ-学会, 2004年09月, [査読有り]
    日本語
  • On the Health Effect Mechanisms of Radon and its Short-lived Decay Products Part 1 : Radon Exhalation Rate in Sapporo and Simple Model of Respiratory Organ(Proceedings of the 51st Meeting of Japan Society of Physiological Anthropology)
    ITO Tomonori, AOKI Tohru, HATAYA Koji, YOKOYAMA Shintaro, SHIMAKURA Kazumi, KURAMAE Masashi, NAGANO Katsunori
    Journal of physiological anthropology and applied human science, 23, 5, 182, 182, 日本生理人類学会, 2004年09月, [査読有り]
    英語
  • Computer Simulation of Whole Body Temperatures and Thermal Sensation and Comfort Votes of Flight Crew(Proceedings of the 51st Meeting of Japan Society of Physiological Anthropology)
    BABA Hiroyasu, YAMAMOTO Noriaki, OZAKI Hirokazu, SHIMAKURA Kazumi, KURAMAE Masashi, NAGANO Katsunori, YOKOYAMA Shintaro
    Journal of physiological anthropology and applied human science, 23, 5, 182, 182, 日本生理人類学会, 2004年09月, [査読有り]
    英語
  • 粒状潜熱蓄熱材を適用した躯体蓄熱床吹出し空調システムに関する研究 第1報 小型実験システムの構築およびその蓄放熱特性
    長野克則, 武田清香, 持田徹, 嶋倉一実, 中村卓司
    日本建築学会環境系論文集, 69, 579, 21, 28, 日本建築学会, 2004年05月30日, [査読有り]
    日本語, A new floor supply air conditioning system, in which thermal capacity is augmented by latent heat storage compared to the general building structure thermal energy storage, is proposed. An experimental apparatus is constructed for the system. Granules including phase change material (PCM), which show phase change around 20℃, are made of foamed glass beads and paraffin waxes. Results from measurements simulated an air conditioning schedule in office buildings indicate that 89% of daily cooling load can be stored in the thermal energy storage period during night under a condition with a 30 mm thick packed bed of the PCM granules.
  • Experiments on thermal environmental design of ceiling radiant cooling for supine human subjects
    K Nagano, T Mochida
    BUILDING AND ENVIRONMENT, 39, 3, 267, 275, PERGAMON-ELSEVIER SCIENCE LTD, 2004年03月, [査読有り]
    英語, 研究論文(学術雑誌), This study aims to clarify the control conditions of ceiling radiant cooling systems for human subjects in a supine position. The results will be useful for the design of hospital rooms and bedrooms.
    Five subjects cooperated in these experiments. The subject put on bedroom attire typical of hospital patients. In total, 28 experiments were per-formed under various conditions. When SET* and PMV were calculated, mean radiant temperatures evaluated from the radiative heat transfer between the inside surfaces of walls, a floor and a ceiling, and the surfaces of a rectangular model of a human body were applied. As a result, it was clarified that SET* and PMV that gave comfortable thermal conditions were around 27.0degreesC and around 0.25degreesC, respectively, in these experimental conditions. On the other hand, reduction of skin temperature on exposed parts such as the instep reduced the favorable impression. However, there was no clear relationship between radiative sensation and favorable impression. (C) 2003 Elsevier Ltd. All rights reserved.
  • Performance of heat charge/discharge of magnesium nitrate hexahydrate and magnesium chloride hexahydrate mixture to a single vertical tube for a latent heat storage system
    K Nagano, K Ogawa, T Mochida, K Hayashi, H Ogoshi
    APPLIED THERMAL ENGINEERING, 24, 2-3, 209, 220, PERGAMON-ELSEVIER SCIENCE LTD, 2004年02月, [査読有り]
    英語, 研究論文(学術雑誌), The authors focused on a mixture of magnesium nitrate hexahydrate as a base material and magnesium chloride hexahydrate as an additive to store and utilize urban waste heat from emerged co-generation systems, typically available at temperatures of 60-90degreesC. The second paper revealed that this mixture has good thermal characteristics as a PCM for latent thermal energy storage. In this study, heat charging and discharging experiments were done using a heat storage tank with a simple vertical heat exchange unit. These showed that effective use of the phase change temperature region resulted in an available enthalpy of 2.0-2.5 times that of sensible heat storage in water. In addition, corrosion tests were conducted and results showed SUS316 and aluminum can be used to build storage tanks and heat exchangers for this mixture. (C) 2003 Elsevier Ltd. All rights reserved.
  • Thermal characteristics of magnesium nitrate hexahydrate and magnesium chloride hexahydrate mixture as a phase change material for effective utilization of urban waste heat
    K Nagano, K Ogawa, T Mochida, K Hayashi, H Ogoshi
    APPLIED THERMAL ENGINEERING, 24, 2-3, 221, 232, PERGAMON-ELSEVIER SCIENCE LTD, 2004年02月, [査読有り]
    英語, 研究論文(学術雑誌), The objective of this study is effective utilization of urban waste heat from emerging co-generation systems, typically available at temperatures of 60-100degreesC. The authors investigated latent heat storage by materials with phase change temperatures in the above range, and focused on a mixture of magnesium nitrate hexahydrate as a base material and magnesium chloride hexahydrate as an additive to modulate the melting point. Addition of 5-10 wt% of the latter resulted in a modulated melting point of around 80degreesC and a heat of fusion of about 150 kJ/kg. Increasing the mix ratio had little effect on heat of fusion, but allowed the melting point to be reduced to about 60degreesC. Repeated melting and solidification tests showed that the heat of fusion and melting point retained their original values after 1000 cycles. (C) 2003 Elsevier Ltd. All rights reserved.
  • Development of a ventilation system utilizing thermal energy storage for granules containing phase change material
    S Takeda, K Nagano, T Mochida, K Shimakura
    SOLAR ENERGY, 77, 3, 329, 338, PERGAMON-ELSEVIER SCIENCE LTD, 2004年, [査読有り]
    英語, 研究論文(学術雑誌), We have developed an experimental ventilation system that features direct heat exchange between ventilation air and granules containing a phase change material (PCM). Measurement of outlet air temperature when the inlet air temperature was periodically varied to simulate changes of outdoor ambient air temperature showed that the outlet air temperature was stabilized and remained within the phase change temperature range. This effect is expected to be useful in practical ventilation systems. The potential of such systems for reducing ventilation load was examined through computer simulation for eight representative cities of Japan. This revealed how different temperature conditions would affect required heat storage capacity. (C) 2004 Elsevier Ltd. All rights reserved.
  • Field experiments and analyses on a hybrid solar collector
    H Saitoh, Y Hamada, H Kubota, M Nakamura, K Ochifuji, S Yokoyama, K Nagano
    APPLIED THERMAL ENGINEERING, 23, 16, 2089, 2105, PERGAMON-ELSEVIER SCIENCE LTD, 2003年11月, [査読有り]
    英語, 研究論文(学術雑誌), This paper describes the effectiveness of a hybrid solar collector that generates both electric power and heat. Experiments and analyses were conducted on power and heat generation characteristics of the hybrid solar collector.
    First, experiments under constant supply temperature of brine were made and it was found that conversion efficiency ranged from 10% to 13%, and that collector efficiencies at 20 and 40 degreesC brine temperature were from 40% to 50% and approximately 20%, respectively.
    Second, the efficiency of the hybrid solar collector was compared to those of a photovoltaic and a solar collector and it was clarified that the hybrid collector had an advantage in terms of exergy efficiency, though there is some lowering of collector efficiency.
    Evaluation of annual energy balance of hybrid solar collectors installed on a low energy house at Hokkaido University proved the hybrid solar collectors to have a high degree of feasibility. (C) 2003 Elsevier Ltd. All rights reserved.
  • F-31 高性能集熱器と潜熱・顕熱蓄熱を有する給湯システムの開発
    長野 克則, 橋本 崇史, 持田 徹, 嶋倉 一實
    学術講演会論文集, 15, 2, 1077, 1080, 社団法人空気調和・衛生工学会, 2003年08月20日
    日本語
  • Development of thermal-photovoltaic hybrid exterior wallboards incorporating PV cells in and their winter performances
    K Nagano, T Mochida, K Shimakura, K Murashita, S Takeda
    SOLAR ENERGY MATERIALS AND SOLAR CELLS, 77, 3, 265, 282, ELSEVIER SCIENCE BV, 2003年05月, [査読有り]
    英語, 研究論文(学術雑誌), The authors have developed experimental thermal-photovoltaic (PV) hybrid exterior wallboards that incorporate of PV cells. The clapboard-shaped hybrid wallboards permit modular assembly that can be more easily adapted for building applications than previous PV systems. Solar heat is collected in the form of heated air circulating in the air gap between the hybrid wallboard and the thermal insulation of the exterior walls. This paper presents an evaluation of both the electrical power generating ability and the solar heat collection capacity during winter of six variations of the experimental thermal-PV hybrid wallboard. In addition, exergy analyses were conducted. (C) 2002 Elsevier Science B.V. All rights reserved.
  • 雪の大規模高密度貯蔵に関する屋外実証実験
    長野 克則, 持田 徹, 嶋倉 一實, 半澤 久, 中村 聡
    日本建築学会環境系論文集, 566, 566, 51, 56, 一般社団法人日本建築学会, 2003年04月30日, [査読有り]
    日本語, A field experiment of large scale snow storage was conducted in Sapporo. Objectives of this experiment are to experimentally verify that the storing snow with adding water is effective for snow compression and for making high density without any mechanical machines. Snow was stored in a large underground pit, which has a diameter of 1.0 m and 6.7 m deep with or without adding water. It was clarified that water addition to the stored snow is very effective to compress the shallow layer of the stored snow. In this time, water permeated through stored snow layer and fell down into the bottom space. It means that added water can be used repeatedly for the compression when water in the bottom space is pumped up. The observed maximum dry snow density was 582 kg/m^3.
  • Development of a database of low energy homes around the world and analyses of their trends
    Yasuhiro Hamada, Makoto Nakamura, Kiyoshi Ochifuji, Shintaro Yokoyama, Katsunori Nagano
    Renewable Energy, 28, 2, 321, 328, 2003年02月
    英語, 研究論文(学術雑誌), This study aims to develop a database of low energy techniques for homes around the world, for use in systematically evaluating the low energy home in each region, where climate, culture and policy differ. First, a database was made for the purpose of the systemizing passive and active techniques. Data were input according to seven chapters and 155 items, and 66 homes in 17 nations have been recorded. Homes adopting super insulation, high airtightness and solar energy utilization are common in the each country. The thermal insulation performance of wall and window of the housing in Japan is somewhat inferior to that overseas. It was shown that exhaust heat recovery is rarely adopted in Japan and that the underground thermal energy utilization was seen in less than 10% of recorded homes. Second, recorded homes were categorized according to characteristics of adopted strategies, and the reduction rate of purchased energy versus the purchased energy for a typical home was calculated. This revealed the purchased energy reduction rate of homes with both solar heat utilization and photovoltaic power generation to be very high. © 2002 Elsevier Science Ltd. All rights reserved.
  • Thermal characteristics of manganese (II) nitrate hexahydrate as a phase change material for cooling systems
    K Nagano, T Mochida, S Takeda, R Domanski, M Rebow
    APPLIED THERMAL ENGINEERING, 23, 2, 229, 241, PERGAMON-ELSEVIER SCIENCE LTD, 2003年02月, [査読有り]
    英語, 研究論文(学術雑誌), The imbalance of electrical demand in summer due to cooling system demand is a big problem in many countries. One promising solution is shifting peak demand from early afternoon to night by utilizing natural cold energy resources such as cool outside air during night or running a refrigerator driven by midnight power. In these cases, using the thermal energy storage (TES) of phase change material (PCM) which has a melting point from 15 to 25 degreesC is one of the most effective ideas. However, few suitable PCMs for this temperature range are at present commercially available. This study aims to evaluate the potential of Mn(NO3)(2).6H(2)O (manganese (11) nitrate hexahydrate) as a new PCM for the TES of cooling systems. First, experiments on the modulation of the melting point of Mn(NO3)(2).6H(2)O and reduction of super-cooling were made by dissolving small amounts of salts in the material. Consequently, MnCl2.4H(2)O was found to have good performance with regard to both modulation of the melting temperature and the heat of fusion. Next, a thermal response test was carried out by using a small cylindrical vessel. Results showed that the required temperature levels for charging and discharging the heat of this mixture were clarified. In addition, the price and safety of this material as a PCM are discussed. (C) 2002 Elsevier Science Ltd. All rights reserved.
  • 9-8.地中熱源ヒートポンプのフィージビリティースタディーと導入ポテンシャル((3)地域エネルギー,Session 9 エネルギー評価・経済)
    長野 克則
    日本エネルギー学会大会講演要旨集, 12, 426, 427, 一般社団法人日本エネルギー学会, 2003年
    日本語
  • 冷熱利用のための雪の貯蔵時における圧縮に関する実験的研究
    長野 克則, 持田 徹, 嶋倉 一實, 半澤 久, 中村 聡
    日本建築学会計画系論文集, 67, 562, 31, 37, 社団法人日本建築学会, 2002年12月, [査読有り]
    日本語, This study aims to experimentally evaluate the compression of snow during storage in a deep storage tank. First, small scale experiments related to acceleration of the compression of snow by means of water addition for three hours were carried out. Results showed that the addition of 20 wt% water was suitable. In addition, coefficients of viscosity of the compression for wet snow in a short term compression were evaluated. Next, long term experiments concerned with compression of dry snow for the wide range of snow density were done. When the initial snow density was high, the changes of coefficients of viscosity of compression with snow density were quite different from the previous empirical equation for the natural fallen snow. It was shown that the maximum dry snow densities were limited and each maximum density reached about 562 kg/m^3 independent of the initial density. Coefficient of viscosity of the compression was approximately 9.0 × 10^<11> Pas at this maximum density. A calculation method of coefficient of viscosity of the compression was proposed using this point for the wide range of the initial snow density.
  • 粒状潜熱蓄熱材利用による給気調温効果と夏季における住宅の換気システムへの適用可能性
    長野 克則, 武田 清香, 持田 徹, 嶋倉 一實
    日本建築学会計画系論文集, 67, 562, 61, 67, 社団法人日本建築学会, 2002年12月, [査読有り]
    日本語, Authors have proposed a direct heat exchange system between granulated phase change materials (PCM) and air. In this paper, experiments are conducted with packed bed of granulated PCM when inlet temperature is changed periodically such as outdoor air temperature. Stabilization effects of supply air temperature are demonstrated by experiments and calculations. Results from a computer simulation program, which was shown in previous paper, can reproduce the variation of actual outlet temperature, which is always in phase change condition. Also, reduction of cooling load for ventilation is examined among 8 cities through the computer simulation. Suitable heat storage capacity is shown.
  • B-46 国土数値情報を用いたエネルギー自律型都市計画手法に関する研究 : 地下熱利用システムの導入可能性
    中村 真人, 濱田 靖弘, 淵上 栄樹, 丸谷 薫, 横山 真太郎, 長野 克則, 窪田 英樹, 落藤 澄
    学術講演会論文集, 14, 3, 1273, 1276, 社団法人空気調和・衛生工学会, 2002年08月08日
    日本語
  • B-47 国土数値情報を用いたエネルギー自律型都市計画手法に関する研究 : 季節間蓄熱利用における熱回収特性と暖冷房システムの数値解析
    淵上 栄樹, 濱田 靖弘, 中村 真人, 丸谷 薫, 横山 真太郎, 長野 克則, 窪田 英樹, 落藤 澄
    学術講演会論文集, 14, 3, 1277, 1280, 社団法人空気調和・衛生工学会, 2002年08月08日
    日本語
  • E-42 都市排熱活用のための相変化蓄熱材の開発と熱特性に関する実験的検討
    長野 克則, 小川 健次, 持田 徹, 嶋倉 一實, 生越 英雅
    学術講演会論文集, 14, 2, 937, 940, 社団法人空気調和・衛生工学会, 2002年08月08日
    日本語
  • E-25 粒状PCMを組み込んだ躯体蓄熱型床吹出し空調に関する研究
    長野 克則, 武田 清香, 持田 徹, 嶋倉 一實, 中村 卓司
    学術講演会論文集, 14, 2, 869, 872, 社団法人空気調和・衛生工学会, 2002年08月08日
    日本語
  • E-62 自然換気を利用するハイブリッド空調の省エネルギー性と温熱環境の評価
    長野 克則, 持田 徹, 林 謙吾
    学術講演会論文集, 14, 3, 1641, 1644, 社団法人空気調和・衛生工学会, 2002年08月08日
    日本語
  • Influence of natural convection on forced horizontal flow in saturated porous media for aquifer thermal energy storage
    K Nagano, T Mochida, K Ochifuji
    APPLIED THERMAL ENGINEERING, 22, 12, 1299, 1311, PERGAMON-ELSEVIER SCIENCE LTD, 2002年08月, [査読有り]
    英語, 研究論文(学術雑誌), Estimation of the heat recovery rate in high-temperature underground storage (>50 degreesC) is required before such a system can be built. However, if high-temperature water is injected into and stored in the aquifer, large-scale natural convection could occur that might reduce the heat recovery rate. This study aims to clarify the universal quantitative condition under which natural convection appears and exerts an observable influence for a system with forced horizontal flow in the saturated porous medium. The authors investigated this using both experiments and computer simulations.
    A test section simulating an aquifer was made. Warm water was injected into the test section, which was filled with glass beads. The temperature distribution and the flow rate profile at the outlet were measured. The authors found that the limit condition at which natural convection influences the forced horizontal flow can be determined from the velocity profile and modified Rayleigh number Ra*. In addition, the heat transfer coefficients of the upper and the lower side of walls were estimated. A computer simulation was made for calculation of the temperature field and the velocity vector in the porous medium under natural convection and under forced convection. As calculated temperature fields and flow rate distributions at the outlet were similar to the experimental results, it is thought that this program can be applied to evaluation of the temperature and the velocity of aquifer thermal energy storage. In addition, an index expressing the degree of influence of natural convection on forced convection was proposed. (C) 2002 Elsevier Science Ltd. All rights reserved.
  • 太陽電池が組み込まれた壁材の冬期における電気・熱ハイブリッド利用特性
    長野 克則, 持田 徹, 嶋倉 一實
    日本建築学会計画系論文集, 67, 556, 39, 45, 社団法人日本建築学会, 2002年06月30日, [査読有り]
    日本語, The authors have developed thermal-photovoltaic (thermal-PV) hybrid exterior wallboards that produce both thermal energy and electricity through solar collection and the incorporation of photovoltaic (PV) cells, respectively. The clapboard-shaped hybrid wallboards permit modular assembly that can be more easily adapted for residential applications than previous PV systems. Solar heat is collected in the form of heated air circulating in the air gap between the hybrid wallboard and the thermal insulation of the exterior walls. This paper presents an evaluation of both the electrical power generating ability and the solar heat collection capacity during winter of six variations of the experimental thermal-PV hybrid wallboard. In addition, exergy analyses were conducted using a computer simulation program written to evaluate the thermal energy collection ability of the hybrid wallboards.
  • 粒状潜熱蓄熱材と空気との直接接触熱交換特性に関する基礎的研究
    長野 克則, 武田 清香, 持田 徹, 嶋倉 一實
    日本建築学会計画系論文集, 67, 556, 55, 61, 社団法人日本建築学会, 2002年06月, [査読有り]
    日本語, Latent heat storage is a kind of heat storage technology and heat is charged or discharged through phase change, melting or solidification, respectively. Authors proposed a direct heat exchange system between granulated phase change material (PCM) and air. PCM is consisted from granulated porous media and paraffin. Its particle diameter is about 1〜3mm. Advantage of this system is that heat transfer coefficient is kept relative large and continuous during phase change. In this investigation, column experiments related with heat exchange between PCM and air were conducted. Also, a computer simulation program was made and phase change period was discussed by the proposal non-dimensional time.
  • ISO‐7933およびISO‐11079の改訂に向けての一提案
    佐古井智紀, 持田徹, 長野克則, 嶋倉一実
    人間と生活環境, 9, 1, 18, 26, 人間-生活環境系学会, 2002年04月, [査読有り]
    日本語, 熱環境を設計および評価する上で,その指標の適用範囲と特性を把握することが重要となる。本論文では,人体と環境間の熱収支に基づくISOの2基準, ISO-7933(暑熱環境の指標)とISO-11079(寒冷環境の指標)について,生体工学的に検討した。その結果,ISO-7933に用いられる重回帰式の人体モデルが,必ずしも人体の温度状態と発汗の関係を表せる訳ではないことを確認し,発汗量を熱平衡の残差から予測するのではなく,生理状態に基づき予測するよう修正するべきであることを提示した。そして,人体への蓄熱および水分損失を評価基準とするISO-7933の概念に基づく温熱指標を作成する上で,人体への蓄熱と水分損失を同時生起として扱うことを提案した。ISO-11079では,全身冷却を対象とする必要着衣量IREQと屋外における局所冷却を対象とする風冷指数WCIの生体工学的解釈の類似性を報告し, ISO-11079におけるWCIの使用目的から, WCIの皮膚温を局所的に不快または危険となる閾値で与えるべきことを示した。
  • 屋外環境における温冷感の実験的検討と評価
    桑原 浩平, 持田 徹, 長野 克則, 嶋倉 一實
    人間と生活環境, 9, 1, 10, 17, 人間-生活環境系学会, 2002年04月, [査読有り]
    日本語, 屋外温熱環境を評価するために札幌にて被験者を用いた温冷感実験を行った。日射を考慮した有効放射温度を含む作用温度,標準作用温度及び標準新有効温度を評価指標として採用し,人の温冷感との対応を見た。実験結果より,まず平均皮膚温と温冷感を比較したところ,個人別の相関係数の方が,被験者全体の相関係数より高い相関が得られた。次に,標準作用温度と日射を考慮した作用温度を温冷感と比較したところ,標準作用温度の方が温冷感との良い一致を示した。この結果より日射を考慮した有効放射温度の有効性が確認できた。さらに,日射を考慮した有効放射温度を組み込んだ標準新有効温度と温冷感の対応を見たところ,良い一致が見られた。
  • Field performance of a Japanese low energy home relying on renewable energy
    Y Hamada, M Nakamura, K Ochifuji, K Nagano, S Yokoyama
    ENERGY AND BUILDINGS, 33, 8, 805, 814, ELSEVIER SCIENCE SA, 2001年10月, [査読有り]
    英語, 研究論文(学術雑誌), This paper describes the construction and evaluation of an experimental low energy home assisted by a hybrid system using natural energy resources and unused energy. The home, for which a ground source heat pump (GSHP) system has been installed, was built on the campus of Hokkaido University, Japan in March 1997. The total floor area of the home is 192 m(2). This home is super insulated and airtight; the calculated coefficient of heat loss is 0.97 W/m(2) K. It has various passive strategies including direct solar heat gain and a ventilation system with an exhaust stack. Photovoltaic (PV) modules, wind power and solar collectors are adopted in order to achieve self-sufficiency in electric power and domestic hot water (DHW) supply. A GSHP is used for space heating and cooling. Two vertical steel wells are used as vertical earth heat exchangers (VHE). In summer, there is a floor cooling system using piped cold water from the VHE. Approximately 80% of the home's total energy was provided by IN modules, solar collectors, as well as underground and exhaust heat. The annual amount of purchased energy during the test period was 12.5% that of a typical home in Hokkaido. (C) 2001 Elsevier Science B.V. All rights reserved.
  • D-45 粒状潜熱蓄熱材と空気との直接熱交換に関する実験的検討
    長野 克則, 持田 徹, 嶋倉 一實, 武田 清香, 谷口 博
    学術講演会論文集, 13, 3, 1501, 1504, 社団法人空気調和・衛生工学会, 2001年08月10日
    日本語
  • D-44 廃熱貯蔵用の相変化蓄熱材の調合とその熱特性
    長野 克則, 持田 徹, 嶋倉 一實, 小川 健次
    学術講演会論文集, 13, 3, 1497, 1500, 社団法人空気調和・衛生工学会, 2001年08月10日
    日本語
  • B-57 椅座時の温冷感覚予測法に関する研究
    佐古井 智紀, 長野 克則, 持田 徹, 嶋倉 一實
    学術講演会論文集, 13, 3, 1345, 1348, 社団法人空気調和・衛生工学会, 2001年08月10日
    日本語
  • C-36 周壁空間における平均放射温度と人体生理心理反応の関係
    桑原 浩平, 長野 克則, 持田 徹, 嶋倉 一實
    学術講演会論文集, 13, 2, 781, 784, 社団法人空気調和・衛生工学会, 2001年08月10日
    日本語
  • 熱伝達率を加味した平均皮膚温の算出式
    桑原 浩平, 持田 徹, 長野 克則, 嶋倉 一實
    人間と生活環境, 8, 1, 33, 40, 人間-生活環境系学会, 2001年06月, [査読有り]
    日本語, 平均皮膚温の算出式として総合熱伝達率比と皮膚面積比の積で表される加重式を提案した。人体と環境の熱平衡式を基に平均皮膚温を算出する式を導くと,皮膚の面積比のみならず各部位と全身の総合熱伝達率の比をも含む形式となった。本研究では,サーマルマネキンを用いて,局所及び全身の総合熱伝達率を求める実験を,立位及び椅座状態で行った結果から,面積比と総合熱伝達率比より構成される加重係数の実測値が求められたが,従来の面積比のみの係数に比べると四肢部の係数が大きくなった。また新たな加重係数を用いて平均皮膚温と放熱量を算出し,他の平均化式を用いた場合との比較検討を行った。
  • F-3 放射暖冷房の評価方法と設計への応用に関する研究
    長野 克則, 持田 徹, 本田 公宏, 武田 清香
    学術講演会論文集, 12, 1, 357, 360, 社団法人空気調和・衛生工学会, 2000年08月10日
    日本語
  • D-62 下水管一体型熱交換器の基礎実験とその応用に関する研究
    長野 克則, 持田 徹, 本田 公宏, 富田 和彦
    学術講演会論文集, 12, 3, 1521, 1524, 社団法人空気調和・衛生工学会, 2000年08月10日
    日本語
  • E-65 日射を含む平均放射温度に関する基礎的検討
    近藤 基, 持田 徹, 桑原 浩平, 長野 克則
    学術講演会論文集, 12, 3, 1605, 1608, 社団法人空気調和・衛生工学会, 2000年08月10日
    日本語
  • E-46 圧密および水分浸透を考えた言の長期間保存と熱回収に関するシミュレーション解析
    長野 克則, 持田 徹, 嶋倉 一實, 宮崎 照朗, 大木 紀通, 半澤 久, 及川 喜代文, 中村 聡
    学術講演会論文集, 12, 2, 973, 976, 社団法人空気調和・衛生工学会, 2000年08月10日
    日本語
  • A-51 等温感線の形状と平均皮膚温・ぬれ面積率の関係
    持田 徹, 嶋倉 實, 佐古井 智紀, 堅田 兼史, 長野 克則
    学術講演会論文集, 12, 3, 1213, 1216, 社団法人空気調和・衛生工学会, 2000年08月10日
    日本語
  • A-50 平均皮膚温の予測に関する基礎的研究
    佐古井 智紀, 長野 克則, 持田 徹, 嶋倉 一實
    学術講演会論文集, 12, 3, 1209, 1212, 社団法人空気調和・衛生工学会, 2000年08月10日
    日本語
  • C-61 札幌における太陽光発電システムの基礎的実験
    長野 克則, 持田 徹, 嶋倉 一實, 村下 和紀, 落藤 澄, 濱田 靖弘, 中村 真人, 羽山 広文
    学術講演会論文集, 11, 3, 1373, 1376, 社団法人空気調和・衛生工学会, 1999年08月10日
    日本語
  • 日本全国の地域冷暖房導入可能性と地球環境保全効果に関する調査研究
    佐土原 聡, 長野 克則, 三浦 昌生, 村上 公哉, 森山 正和, 下田 吉之, 片山 忠久, 依田 浩敏, 北山 広樹
    日本建築学会計画系論文集, 510, 510, 61, 67, 社団法人日本建築学会, 1998年08月, [査読有り]
    日本語, The purpose of this study is to clearify the possibility of diffusion of District Heating and Cooling (DHC) in Japan in the near future and its effects on global environment preservation. We selected potential supplied areas of DHC in all over Japan by analyzing heating, cooling and hot-water demand character. We investigated the sourrounding unused energy of the selected areas and analyzed its effect. As a result, total DHC demand is 259,933TJ/a (62,185Tcal/a), that is quivalent to 11.1% of total demand in Japan. By using unused energy as heat sources, 88,733TJ/a (21,228Tcal/a) of primary energy consumption and 1.78 mil.ton of CO_2 emission can be reduced per year in Japan. It means that the DHC promotion is very important and realistic policy in urban area for CO_2 emission which contributes to global environment preservation.
  • D-30 都市内建物における小型風力発電導入効果の検討
    長野 克則, 持田 徹, 嶋倉 一實, 畠野 隆志
    学術講演会論文集, 10, 2, 865, 868, 社団法人空気調和・衛生工学会, 1998年07月10日
    日本語
  • E-30 屋外での着衣量と温熱感に関する検討
    持田 徹, 長野 克則, 嶋倉 一實, 木村 研, 近藤 基
    学術講演会論文集, 10, 2, 965, 968, 社団法人空気調和・衛生工学会, 1998年07月10日
    日本語
  • C-41 床暖房の熱的快適性に関する実験的研究
    持田 徹, 嶋倉 一實, 長野 克則, 竹田 豊次
    学術講演会論文集, 10, 3, 1425, 1428, 社団法人空気調和・衛生工学会, 1998年07月10日
    日本語
  • B-4 平均皮膚温およびぬれ面積率と等温感の相互関係に関する基礎実験
    持田 徹, 長野 克則, 嶋倉 一實, 堅田 兼史, 右田 拓也
    学術講演会論文集, 8, 1, 89, 92, 社団法人空気調和・衛生工学会, 1996年08月01日
    日本語
  • C-23 低温水床暖房の省エネルギー性と適応限界の実験 : 第2報 室内温熱環境と熱収支
    落藤 澄, 横山 真太郎, 長野 克則, 中村 真人, 濱田 靖弘, 朝桐 大介, 平井 和子, 青木 徹, 井阪 充大
    学術講演会論文集, 8, 2, 661, 664, 社団法人空気調和・衛生工学会, 1996年08月01日
    日本語
  • A-37 札幌における自然気候下の土壌温度の実測 : 第2報 採取土壌試料の比熱及び熱伝導率の測定
    落藤 澄, 長野 克則, 中村 真人, 濱田 靖弘, 久光 宏信, 半澤 久, 鈴木 雅幸
    学術講演会論文集, 7, 1, 965, 968, 社団法人空気調和・衛生工学会, 1995年09月01日
    日本語
  • C-38 札幌市の水に賦存する熱エネルギーとエネルギーフローの検討
    成田 樹昭, 落藤 澄, 長野 克則
    学術講演会論文集, 7, 1, 1149, 1152, 社団法人空気調和・衛生工学会, 1995年09月01日
    日本語
  • A-36 札幌における自然気候下の土壌温度の実測 : 第1報 測定基地の概要および測定経過
    落藤 澄, 長野 克則, 中村 真人, 濱田 靖弘, 久光 宏信, 半澤 久, 鈴木 雅幸
    学術講演会論文集, 7, 1, 961, 964, 社団法人空気調和・衛生工学会, 1995年09月01日
    日本語
  • G-30 排熱利用による地域熱供給システムの構成と評価 : 第8報 地域熱電供給システムの適性導入規模及び効果
    落藤 澄, 中村 真人, 佐藤 秀紀, 長野 克則, 森下 直樹
    学術講演会論文集, 7, 2, 941, 944, 社団法人空気調和・衛生工学会, 1995年09月01日
    日本語
  • B-36 札幌における業務用建物のエネルギ消費量調査
    落藤 澄, 長野 克則, 梅本 延彦, 森下 直樹
    学術講演会論文集, 6, 3, 1157, 1160, 社団法人空気調和・衛生工学会, 1994年09月01日
    日本語
  • E-1 垂直埋設管を用いた季節間土壌蓄熱に関する研究 : 第1報 冬期土壌採熱と冷蓄熱の実験
    長野 克則, 落藤 澄, 中村 真人, 永坂 茂之, 濱田 靖弘, 朝桐 大介, 半澤 久, 鴫原 亮, 長倉 香織
    学術講演会論文集, 6, 1, 273, 276, 社団法人空気調和・衛生工学会, 1994年09月01日
    日本語
  • E-2 垂直埋設管を用いた季節間土壌蓄熱に関する研究 : 第2報 3種類の熱交換器の採熱特性の解析
    長野 克則, 落藤 澄, 中村 真人, 永坂 茂之, 濱田 靖弘, 朝桐 大介, 半澤 久
    学術講演会論文集, 6, 1, 277, 280, 社団法人空気調和・衛生工学会, 1994年09月01日
    日本語
  • E-6 線源理論を用いた土壌垂直埋設管の表面温度に関する近似方法
    落藤 澄, 長野 克則, 横山 真太郎, 中村 真人, 永坂 茂之, 濱田 靖弘
    学術講演会論文集, 6, 1, 293, 296, 社団法人空気調和・衛生工学会, 1994年09月01日
    日本語
  • D-12 国際標準データ作成のための昼光と日射の測定および解析 : (第4報)札幌における発光効率と日射量・照度の予測法
    中村 真人, 落藤 澄, 長野 克則, 横山 真太郎, 柿岡 直樹
    学術講演会論文集, 6, 1, 249, 252, 社団法人空気調和・衛生工学会, 1994年09月01日
    日本語
  • E-7 地下帯水層の長期蓄熱に関する研究
    落藤 澄, 長野 克則, 中村 真人, 吉田 裕司, 柴田 章貴, 小端 武治
    学術講演会論文集, 6, 1, 297, 300, 社団法人空気調和・衛生工学会, 1994年09月01日
    日本語
  • B-27 札幌市リサイクル団地の排熱利用の可能性
    落藤 澄, 長野 克則, 成田 樹昭, 佐藤 秀紀
    学術講演会論文集, 6, 2, 613, 616, 社団法人空気調和・衛生工学会, 1994年09月01日
    日本語
  • F-53 排熱利用による地域熱供給システムの構成と評価 : 第7報システム構成およびシミュレーションによる評価
    落藤 澄, 長野 克則, 中村 真人, 渡辺 英紀, 梅本 延彦, 森下 直樹
    学術講演会論文集, 6, 3, 1601, 1604, 社団法人空気調和・衛生工学会, 1994年09月01日
    日本語

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