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Kikuta Koki

Faculty of Engineering　Architecture　Research Group of Architectural and Environmental DesignAssociate Professor

Researcher basic information

■ Degree
  • Doctor of Engineering, Hokkaido University, Mar. 2006
■ URL
researchmap URLホームページURL■ Various IDs
ORCID ID■ Research Keywords and Fields
Research Keyword
  • Architectural Environment and Equipment
Research Field
  • Social Infrastructure (Civil Engineering, Architecture, Disaster Prevention), Architectural environment and building equipment
■ Educational Organization

Career

■ Career
Career
  • Apr. 2018 - Present
    Faculty of Engineering, Hokkaido University, Associate Professor
  • Apr. 2010 - Mar. 2018
    Faculty of Engineering, Hokkaido University, Assistant Professor
  • Apr. 2013 - Nov. 2013
    Polytechnic University of Turin, Visiting Scholar
  • Apr. 2007 - Mar. 2010
    Graduate School of Engineering, Hokkaido University, Assistant Professor
  • Apr. 2006 - Mar. 2007
    Graduate School of Engineering, Hokkaido University, Instructor
  • Jun. 2005 - Mar. 2006
    Graduate School of Engineering, Hokkaido University, Research Assistant
Educational Background
  • Apr. 2005 - Mar. 2006, Hokkaido University, Graduate School of Engineering, Division of Human Environmental Systems, Japan
  • Apr. 2003 - Mar. 2005, Hokkaido University, Graduate School of Engineering, Division of Urban and Environmental Engineering, Japan
  • Apr. 1999 - Mar. 2003, Hokkaido University, Faculty of Engineering, Department of Architecture, Japan

Research activity information

■ Awards
  • May 2026, SHASE, Achievement Award, SHASE
    環境建築と熱負荷・熱環境シミュレーション法に関する研究 シミュレーション技術の動向調査とコンポーネントプログラムの開発
  • Mar. 2026, JAHMEC, Incentive Award, JAHMEC
    病棟における空気環境の実態調査 建築物環境衛生管理基準との比較
  • May 2025, JABMEE, Carbon Neutral Award
    北海道地区FMセンター 地域脱炭素を目指した小規模オフィスの環境・設備計画と検証
  • May 2025, SHASE, Achievement Award, SHASE
    快適な室内空気質に関する調査研究
  • May 2025, SHASE, Technology Promotion Award, SHASE
    北海道地区FMセンター－地域脱炭素を目指したオフィスの環境・設備計画と検証－
  • Mar. 2025, JAHMEC, Incentive Award, JAHMEC
    ダクト式全館空調システム住宅におけるエアロゾル拡散に関する研究
  • Nov. 2024, SIEJ, Incentive Award, SIEJ
    ダクト式全館空調システム住宅の室内濃度シミュレーションを用いたエアロゾル感染リスクの試算
  • May 2024, SHASE, Technology Promotion Award, SHASE
    信頼性と省エネルギー性に配慮した「NHK札幌放送会館」の計画
  • Mar. 2024, JAHMEC, Incentive Award, JAHMEC
    COVID-19対策のための換気設備の増設 北海道と福岡県の保育施設における検証
  • May 2023, JABMEE, Carbon Neutral Award
    北ガスグループ本社ビル
  • May 2022, SHASE, Technology Promotion Award, SHASE
    北ガスグループ本社ビル 積雪寒冷地の都心型エネルギー供給オフィスビルにおける環境設備計画
    Japan
  • Aug. 2021, AIJ, Japan Architectural Review, Best Paper Award
    Measures against COVID-19 concerning summer indoor environment in Japan
    Japan
  • May 2020, SHASE, Technology Promotion Award, SHASE
    北海道で初の『ZEB』を実現したアリガプランニング新社屋ビルの環境計画と性能評価
    Japan
  • May 2020, SHASE, Achievement Award, SHASE
    室内空気質のための必要換気量の設計基準濃度の提案
    Japan
  • May 2017, SHASE, Technology Promotion Award, SHASE
    北見信用金庫紋別支店『まちのシンボル』となる空間の環境・設備計画
    Japan
  • May 2017, JABMEE, Carbon Neutral Award
    北海道ガス札幌東ビルにおける低炭素化の取組み
    Japan
  • May 2016, SHASE, Technology Promotion Award, SHASE
    北海道ガス 札幌東ビル 技術開発・研修センターの環境計画と建築設備
    Japan
  • May 2016, JABMEE, Carbon Neutral Award
    北見信用金庫紋別支店における低炭素化の取組みと実証評価
    Japan
  • Feb. 2015, Hokkaido, Science and Technology Incentive Award, Hokkaido
    再生可能エネルギー利用促進と快適性向上を図った北方型環境建築の研究開発
    Japan
  • Mar. 2009, JSES, Naoaki Ito Award, JSES
    断熱建物におけるトップライト型ボイド空間の熱・光環境計画に関する研究 その2 模型実験における入射光による各階の日射負荷の推定
    Japan
  • Mar. 2009, JSES, Incentive Award, JSES
    断熱建物におけるトップライト型ボイド空間の熱・光環境計画に関する研究 その2 模型実験における入射光による各階の日射負荷の推定
    Japan
  • May 2005, Hokkaido Branch of SHASE, Incentive Award, Hokkaido Branch of SHASE
    高断熱建物における床暖冷房システムと室温変動の許容に関する研究
    Japan
  • Mar. 2003, Hokkaido Branch of AIJ, Award, Hokkaido Branch of AIJ
    優秀学生
    Japan
■ Papers
■ Other Activities and Achievements
■ Syllabus
  • 環境デザイン工学特論, 2024年, 修士課程, 工学院
  • 環境デザイン工学特論, 2024年, 博士後期課程, 工学院
  • 計画・設計演習Ⅰ, 2024年, 学士課程, 工学部
  • 計画・設計演習Ⅲ, 2024年, 学士課程, 工学部
  • 一般教育演習(ﾌﾚｯｼｭﾏﾝｾﾐﾅｰ), 2024年, 学士課程, 全学教育
  • 都市環境計画, 2024年, 学士課程, 工学部
  • 計画・設計演習Ⅱ, 2024年, 学士課程, 工学部
■ Affiliated academic society
  • 2021 - Present
    JAPANESE SOCIETY OF PUBLIC HEALTH
  • 2007 - Present
    JAPAN SOLAR ENERGY SOCIETY
  • 2003 - Present
    ARCHITECTURAL INSTITUTE OF JAPAN
  • 2003 - Present
    THE SOCIETY OF HEATING, AIR-CONDITIONING AND SANITARY ENGINEERS OF JAPAN
■ Research Themes
  • 中央熱源方式における同時使用率の整備による熱源機器容量の最適化と設計手法の構築
    科学研究費助成事業
    01 Apr. 2022 - 31 Mar. 2025
    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。
    日本学術振興会, 基盤研究(C), 地方独立行政法人北海道立総合研究機構, 22K04445
  • Studies on effect of continuous ventilation upon dwellers' health in houses
    Grants-in-Aid for Scientific Research
    01 Apr. 2020 - 31 Mar. 2025
    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, Grant-in-Aid for Scientific Research (A), Hokkaido University, 20H00276
  • Optimization on Heat Source Equipment Capacity of Central Heat Source System by Constructing a Probabilistic Calculation Method for Simultaneous Use Rate
    Grants-in-Aid for Scientific Research
    01 Apr. 2019 - 31 Mar. 2022
    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, Grant-in-Aid for Scientific Research (C), Hokkaido Research Organization, 19K04745
  • Evaluation of the impact of local environment and living environment on health risk using big data
    Grants-in-Aid for Scientific Research
    28 Jun. 2019 - 31 Mar. 2021
    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, Grant-in-Aid for Challenging Research (Exploratory), Hokkaido University, 19K22000
  • Research on high efficiency and reliability of air conditioning system for production facility
    Grants-in-Aid for Scientific Research
    01 Apr. 2018 - 31 Mar. 2021
    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, Grant-in-Aid for Scientific Research (B), Hokkaido University, 18H01591
  • Study on the prediction of health risk and literacy effect in houses in the age of supper aging and energy saving
    Grants-in-Aid for Scientific Research
    01 Apr. 2016 - 31 Mar. 2020
    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, Grant-in-Aid for Scientific Research (A), National Institute of Public Health, 16H02380
  • Development of high performance passive ventilation house for the northern region
    Grants-in-Aid for Scientific Research
    01 Apr. 2016 - 31 Mar. 2019
    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, Grant-in-Aid for Scientific Research (C), Hokkaido University, 16K06606
  • Study on Air-conditioning Systems and Reliability evaluation for a High Heat Density Equipment Room
    Grants-in-Aid for Scientific Research
    01 Apr. 2014 - 31 Mar. 2017
    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, Grant-in-Aid for Scientific Research (B), Hokkaido University, 26289199
  • Establishment of living environment preparation method for without heating applied to both daily life and emergency
    Grants-in-Aid for Scientific Research
    01 Apr. 2012 - 31 Mar. 2015
    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, Grant-in-Aid for Scientific Research (C), Hokkaido University, 24560708
  • Ascertaining the actual physical effects of indoor temperature environments
    Grants-in-Aid for Scientific Research
    01 Apr. 2011 - 31 Mar. 2014
    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, Grant-in-Aid for Scientific Research (B), Hokkaido University, 23360253
  • Development of environment-conscious convenience stores considering the regionality and practicability
    Grants-in-Aid for Scientific Research
    2010 - 2011
    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, Grant-in-Aid for Young Scientists (B), Hokkaido University, 22760433
  • Suggestion and Development of thermal storage heating and cooling systems by the water method applicable to highly insulated office buildings
    Grants-in-Aid for Scientific Research
    2007 - 2008
    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, Grant-in-Aid for Young Scientists (B), Hokkaido University, 19760401
  • Improved Effect for Thermal and Aero Environment of Indoor Open Spaces by Using Cool Running Water and Hybrid Ventilation
    Grants-in-Aid for Scientific Research
    2005 - 2007
    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.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 17360280