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Last Updated :2024/11/01

Researcher Profile and Settings

Master

Affiliation (Master)

  • Faculty of Engineering　Division of Architecture　Research Group of Architectural and Environmental Design

Affiliation (Master)

  • Faculty of Engineering　Division of Architecture　Research Group of Architectural and Environmental Design

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Profile and Settings

Degree

  • Doctor of Engineering（2006/03 Hokkaido University）

Profile and Settings

  • Name (Japanese)

    Kikuta

  • Name (Kana)

    Koki

Alternate Names

Achievement

Research Interests

  • Architectural Environment and Equipment   

Research Areas

  • Social infrastructure (civil Engineering, architecture, disaster prevention) / Construction environment and equipment

Research Experience

  • 2018/04 - Today Faculty of Engineering, Hokkaido University Associate Professor
  • 2010/04 - 2018/03 Faculty of Engineering, Hokkaido University Assistant Professor
  • 2013/04 - 2013/11 Polytechnic University of Turin Visiting Scholar
  • 2007/04 - 2010/03 Graduate School of Engineering, Hokkaido University Assistant Professor
  • 2006/04 - 2007/03 Graduate School of Engineering, Hokkaido University Instructor
  • 2005/06 - 2006/03 Graduate School of Engineering, Hokkaido University Research Assistant

Education

  • 2005/04 - 2006/03  Hokkaido University  Graduate School of Engineering  Division of Human Environmental Systems
  • 2003/04 - 2005/03  Hokkaido University  Graduate School of Engineering  Division of Urban and Environmental Engineering
  • 1999/04 - 2003/03  Hokkaido University  Faculty of Engineering  Department of Architecture

Awards

  • 2024/05 Technology Promotion Award, SHASE
  • 2023/05 Carbon Neutral Award, JABMEE
  • 2022/05 Technology Promotion Award, SHASE
  • 2021/08 Japan Architectural Review, Best Paper Award
  • 2020/05 Technology Promotion Award, SHASE
  • 2020/05 Achievement Award, SHASE
  • 2017/05 Technology Promotion Award, SHASE
  • 2017/05 Carbon Neutral Award, JABMEE
  • 2016/05 Technology Promotion Award, SHASE
  • 2016/05 Carbon Neutral Award, JABMEE
  • 2015/02 Science and Technology Incentive Award, Hokkaido
  • 2009/03 Naoaki Ito Award, JSES
  • 2009/03 Incentive Award, JSES
  • 2005/05 Incentive Award, Hokkaido Branch of SHASE
  • 2003/03 Award, Hokkaido Branch of AIJ

Published Papers

MISC

Association Memberships

  • JAPANESE SOCIETY OF PUBLIC HEALTH   JAPAN SOLAR ENERGY SOCIETY   ARCHITECTURAL INSTITUTE OF JAPAN   THE SOCIETY OF HEATING, AIR-CONDITIONING AND SANITARY ENGINEERS OF JAPAN   

Research Projects

  • 日本学術振興会：科学研究費助成事業
    Date (from‐to) : 2022/04 -2025/03 
    Author : 阿部 佑平, 菊田 弘輝
     
    本研究の目的は、中央熱源方式の非住宅建築物を対象に、未だ十分なデータ構築がされていない同時使用率を整備し、同時使用率の考慮による熱源機器容量の最適化と設計手法を構築することである。今年度の研究成果を以下に記す。 １）非住宅建築物における熱源機器容量の設計実態の把握 中央熱源方式のオフィスビルを対象とした熱源機器容量の設計実態を把握するため、オフィスビルの設計経験がある機械設備設計者を対象としたアンケートを実施した（回答数：171件、有効回答：164件）。 アンケートより、中央熱源方式を採用することの多い建物規模は、10,000㎡以上の床面積であることが分かった。 また、同時使用率を考慮した設計の実施状況を聞いたところ、「考慮した設計を行っている」と回答した設計者は46％、「考慮した設計を行っていないが、必要性を感じる」と回答した設計者は35％であり、設計者の多くが同時使用率の必要性を感じていた。また、同時使用率を考慮した設計を行っている設計者に、同時使用率の値を設定する際の考え方を聞いたところ、類似建物における「経験値」をもとに設定している設計者が最も多く、次いで、ヒアリングにおける「想定値」をもとに設定している設計者が多かった。また、設計で使用する同時使用率の具体的な値を聞いたところ、冷房の平均値は77％、暖房の平均値は76％であった。
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2020/04 -2025/03 
    Author : 林 基哉, 金 勲, 菊田 弘輝, 長谷川 兼一, 稲葉 洋平, 東 賢一, 本間 義規, 田島 昌樹, 山田 裕巳
     
    2022年度の調査研究によって以下の知見を得た。 ①常時換気と室内空気質に関する実態調査では、ほとんどの対象で厚生労働省の室内濃度指針値を下回ったが、アセトアルデヒドは指針値を超える対象があり、TVOCは暫定目標値を超える対象があった。αピネンがTVOCを引き上げていることが確認された。 ②室内空気質と健康リスクに関する調査分析では、常時換気設備の有無、COVID-19対応の窓開け換気の有無によって、室内化学物質濃度に有意な差が見られなかった。一方で、室内環境と健康影響に関するリテラシーが室内化学物質濃度に影響することが示唆された。 ③常時換気による室内空気質改善に関する分析では、化学物質の使用に関する配慮を行った対象では、厚生労働省の室内濃度指針値を下回っているが、アセトアルデヒドについては、指針値に近い対象があった。TVOCの暫定目標値については、多くの場合に上回った。換気量は必要換気量をほぼ満たしているが、αピネンがTVOCの主な成分であること、アセトアルデヒド濃度が高いことから、木材由来の化学物質の影響が顕著であることが確認された。また、エタノールとアセトアルデヒドの濃度に関係性が見られたことから、COVID-19対応のための消毒の影響が示唆された。COVID-19対応のために、隔離室を設けた場合の実験と家庭内エアロゾル感染リスクの試算を行った結果、常時換気の種類によってリスクが顕著に異なることを確認し、その対策例を示した。
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2019/04 -2022/03 
    Author : Abe Yuhei
     
    In this study, a survey was conducted in an apartment house with a heating system using a central heat source system to clarify the actual situation of the simultaneous use rate. In order to evaluate the impact of the number of dwelling units and household composition on the simultaneous use rate in an apartment house, a probabilistic calculation method for the simultaneous use rate based on combinatorics was constructed. The study of heat source equipment capacity considering the simultaneous use rate using the constructed method showed that it is possible to optimize the heat source equipment capacity compared to the general design, and that this improves the load factor of the heat source equipment and reduces energy consumption.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2019/06 -2021/03 
    Author : Hayama Hirofumi
     
    Research into seasons and health is a field related to biometeorology and public health. This research used big data that included mortality tables in vital statistics data of the Ministry of Health, Labor and Welfare (1972-2016), AMeDAS meteorological data of the Japan Meteorological Agency, Ministry of Land, Infrastructure, Transport and Tourism (approximately 1300 locations throughout Japan), housing and land statistics and national census data of the Ministry of Internal Affairs and Communications, etc.. The research made progress in the following items, clarified the factors affecting health risks, and obtained indices for the formation of healthy and safe local environments and living environments. 1) Development of a technique for linking essential data from various types of big data, 2) Evaluation of how season and outside air temperature affect the risk of death, 3) Clarification of changes in housing policies over time and risk of death
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2018/04 -2021/03 
    Author : Hayama Hirofumi
     
    This research concerned air conditioning facilities in data centers that accommodate mostly IT equipment and precision machining factories that accommodate high-heat-generating machine tools. With the aim of cooling the heat generated by equipment in an accurate and highly efficient manner while ensuring a satisfactory indoor work environment for workers. The following results were obtained, 1) Clarification of determining factors in air conditioning efficiency and development of an air conditioning system that linked IT equipment and air conditioning facilities, 2) Development of a latent-heat/sensible-heat cooling system using cool outside air, 3)Quantification of maintenance data of air conditioning facilities and development of reliability evaluation tools associated with changes in room temperature, 4) Creation of a model for temperature-stratification formative factors in a displacement ventilation system and development of a prediction method
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2016/04 -2020/03 
    Author : Hayashi Motoya
     
    A survey on houses, indoor environment and residential literacy was conducted, and a method of estimating indoor environment in consideration of residential literacy and a model of houses for physically vulnerable persons were developed in this study. The results show that it is necessary to build houses in accordance with weather conditions and the performance of houses and to improve people's residential literacy. They also show that few people know 24-hour ventilation recommended in Building Code on Sick House, that heat shock in winter is remarkable in old houses, that the infection risk is high because of the difficulty of the stable control of humidity, and that new chemical contamination which has been not yet regulated seems to become serious. This study will lead to a basic guideline for residential literacy.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2016/04 -2019/03 
    Author : Kikuta Koki
     
    The following three points were the main research items in the development of high performance passive ventilation house for the northern region: 1) evaluation of basic performance and living environment in this house, 2) construction of the design tool for passive ventilation and whole-room heating, 3) examination of building and equipment specifications and community heating suitable for solar and biomass heat utilization types. Specifically, in the demonstration experiment, we collected the basic data, checked the thermal comfort and measured the indoor air quality. The characteristics of air circulation and whole-room heating peculiar to passive ventilation were clarified. On the other hand, in the numerical simulation, we examined the high performance passive ventilation house and house group suitable for solar and biomass heat utilization types in various ways. The effects of single house and its assembly were estimated according to the area and household composition.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2014/04 -2017/03 
    Author : Hayama Hirofumi, KOHATA Yuji, KOJIMA Shunichi, MATSUMOTO Wakana, INOUE Yoshiyuki
     
    This series of studies relates to air conditioning facilities for rooms accommodating IT equipment that generates large amounts of heat. To ensure that this equipment is cooled reliably and efficiently, we focus on three main points: (1) optimizing the thermal environment inside the room, (2) improving the efficiency of the air conditioning facilities, and (3) ensuring that these facilities operate reliably. We systematically organize issues that cross the boundaries between different industrial fields; “IT equipment design & construction (manufacturing industry), architecture and operation of information services (service industry), and air conditioning equipment design & construction (construction industry)” and quantitatively clarify the measures to be taken and the effects of these measures. The results of these studies are compiled into highly practical form.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2012/04 -2015/03 
    Author : KIKUTA Koki
     
    Measurement, questionnaire and energy surveys, numerical simulation, and so on were performed at detached houses and school gymnasiums for without heating in the future. As a result, it was clarified that 1)-3) were positioned as important living environment preparation method: 1) passive ventilation house for promoting use of renewable energy, for example, solar heat and firewood, 2) gymnasium designed at school with gymnasium surrounded by classrooms, and 3) gymnasium designed by high thermal insulation in order to prepare for heating function stop.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2011/04 -2014/03 
    Author : HAYAMA Hirofumi, SAITO Masaya, KIKUTA Koki, MORI Taro, UMEMURA Tomohiro
     
    (1) We obtained demographic statistical data from the Ministry of Health, Labour and Welfare, and analyzed the relevance of causes of death and weather conditions for deaths in different regions and locations. (2) With the cooperation of medical institutions involved in home care and nursing, we took simultaneous measurements of indoor temperature environments and physiological data to understand how the body is affected by the indoor temperature environment.(3) We took simultaneous measurements of the indoor temperature environment and physiological data (blood pressure, heart rate) before and after bathing to understand how the indoor temperature environment affects the body.(4) Using data on the distribution of room temperatures inside residences, we analyzed the factors contributing to the occurrence of temperature distributions. (5) We prepared guidelines for the planning of residential buildings and residential environments that take health and safety into consideration.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2010 -2011 
    Author : KIKUTA Koki, TANAKA Yurika, KAKIMOTO Junko, KANEKO Ryohei
     
    1) The architectural/HVAC specifications and operational conditions were statistically organized, and the prediction models of electricity consumption in CVS based on factor analysis for it were created. 2) The effects on temperature distribution by the differences in each temperature settings for merchandise management specific to CVS or air-conditioning system, etc. were analyzed. 3) The ratio of electricity consumption and annual energy consumption per unit area specific to CVS were shown, and the valuation method of energy efficiency applicable to CVS was proposed. 4) After considering the regionality and practicability, the reduction effects by architectural methods and operational improvements with a focus on air-conditioning load were quantified.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2007 -2008 
    Author : KIKUTA Koki, IZUMI Takanori, YOSHIKAWA Mayumi, SHIRAISHI Yohei, HATANAKA Masahiro, IMAI Ayako, ITO Nasaki
     
    水方式による躯体蓄熱暖冷房システムは,高断熱建物における室内負荷の顕熱成分に対応するシステムである.CASBEEの最高ランクS に相当する建物を対象に,本システムのコミッショニング及びシステムチューニングを実施し,快適性・省エネ性・経済性の向上を確認した.また,低温温水による輻射暖房ならびに高温冷水による輻射冷房の可能性を示唆し,本システムと併用する形で,ダブルスキンにおける省エネルギー効果,トップライトボイド空間における各階の日射負荷の分配率を明らかにした.
  • Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research
    Date (from‐to) : 2005 -2007 
    Author : ENAI Masamichi, HAYAMA Hirofumi, KIKUTA Koki, MORI Taro, HAYASHI Motoya, NISHIZAWA Shigeki
     
    In this report, as the first step, transfer model of heat and moisture for horizontal running water was indicated according to balance of heat and moisture measured in the laboratory. At the second step, CFD (computer fluid dynamics) which was built with transfer model of heat and moisture was compared with actual results as a numerical verification. We need to measure actually distribution of air velocity for adjacent boundary layer on the running water surface for explaining a transfer mechanism of heat and moisture. Such distributions of air velocity on the running water surface were measured by using PIV. It is necessary to estimate by using numerical simulations before planning thermal-aero environment of indoor open spaces. At the third step, improved effects were evaluated by using numerical simulations for planning future thermal-aero environment of indoor open spaces. To design thermal-aero environment for inner open spaces, we need to know the relationship between illuminate environment and solar radiation trough the glass roofs for such spaces. It is possible to estimate thermal load for void spaces of top light type. Classification of atrium spaces was done like side-core model, center core model and linear core model. Best option was indicated from the parameter analysis of PIV. To discuss the numerical analysis by using macro-model that needs for planning of thermal-aero environment to use weak temperature distribution in inner open spaces should be continued. Also CFD analysis used cool running water surface should be continued.

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