Updated on 2025/07/31

写真a

 
UKAI, Masanari
 
Affiliation
Faculty of Science and Engineering, School of Creative Science and Engineering
Job title
Assistant Professor(non-tenure-track)
 

Papers

  • EFFECTS OF WORKSTYLE COMBINING OFFICE WORK AND WORKING FROM HOME ON WELL-BEING AND WORKPLACE PRODUCTIVITY OF WORKERS

    Toshiki SHINNO, Masanari UKAI, Takuya MURAKAMI, Kosuke IIHARA, Nodoka TAGAWA, Osamu KIYOTA, Osamu KUNITOMO, Hiromichi NISHIDA, Shin-ichi TANABE

    Journal of Environmental Engineering (Transactions of AIJ)   89 ( 824 ) 589 - 597  2024.10

    DOI

    Scopus

  • THE EFFECTS OF PSYCHOLOGICAL RESILIENCE OF WORKERS ON WELL-BEING

    Nodoka TAGAWA, Masanari UKAI, Kosuke IIHARA, Toshiki SHINNO, Osamu KIYOTA, Osamu KUNITOMO, Hiromichi NISHIDA, Shin-ichi TANABE

    Journal of Environmental Engineering (Transactions of AIJ)   89 ( 824 ) 598 - 604  2024.10

    DOI

    Scopus

  • THERMAL COMFORT ASSESSMENT IN OFFICES WITH ENVIRONMENTAL SELECTIVITY

    Kazuki AONO, Masanari UKAI, Yoriaki NITTA, Chiaki SHIMOYAMA, Kentaro KIMURA, Akihiro SHIMIZU, Shin-ichi TANABE

    Journal of Environmental Engineering (Transactions of AIJ)   89 ( 822 ) 448 - 459  2024.08

    DOI

    Scopus

  • パーソナル空調の操作性が執務者の熱的快適性・知的生産性に与える影響

    Kazuki AONO, Masanari UKAI, Daiki TAKEHARA, Kentaro KIMURA, Akihiro SHIMIZU, Atsushi TAKAMUKU, Daisuke HATORI, Shin-ichi TANABE

    Journal of Environmental Engineering (Transactions of AIJ)   88 ( 813 ) 829 - 837  2023.11

    DOI

    Scopus

    1
    Citation
    (Scopus)

  • Well-being and Workplace Productivity of Workers Combining Office Work and Working from Home

    Toshiki Shinno, Masanari Ukai, Yuta Fukawa, Takuya Murakami, Kosuke Iihara, Osamu Kiyota, Osamu Kunitomo, Hiromichi Nishida, Shin Ichi Tanabe

    Healthy Buildings Europe 2023: Beyond Disciplinary Boundaries   2   624 - 631  2023

    　View Summary

    With the COVID-19 pandemic in 2020, a work style that combines office work and working from home (WFH) has rapidly spread in Japan. This change in work style is thought to have changed the lifestyle of workers and affected their well-being, which represents their physical, mental, and social health. The purpose of this study is to clarify the effects of work style, combining office work and WFH, on the well-being of workers, and the effects of changes in workers’ well-being on their workplace productivity. For this study, a questionnaire survey was conducted on workers, and a statistical analysis was conducted on the data obtained from 339 workers. The results showed that the physical, mental, and social health of approximately 50% of the workers improved as a result of combining office work and WFH. The analysis also found that of the three health dimensions of well-being, mental health in particular had a significant impact on workplace productivity and satisfaction in WFH. Furthermore, physical and social health have been shown to influence workplace productivity and satisfaction through their effects on mental health. This study showed a relationship between the three health dimensions of well-being and their relationship with workplace productivity and satisfaction.

  • BEHAVIOR AND WORKPLACE PRODUCTIVITY OF WORKERS IN OFFICE AND FROM HOME

    Takuya MURAKAMI, Masanari UKAI, Yuta FUKAWA, Yuto CHIMOTO, Kosuke IIHARA, Osamu KIYOTA, Hiromichi NISHIDA, Shin-ichi TANABE

    Journal of Environmental Engineering (Transactions of AIJ)   87 ( 802 ) 888 - 894  2022.12

    DOI

    Scopus

    5
    Citation
    (Scopus)

  • Building wellness performance and work engagement

    Masanari Ukai, Yuto Chimoto, Takuya Murakami, Yuya Suzuki, Shin‐ichi Tanabe

    JAPAN ARCHITECTURAL REVIEW   5 ( 4 ) 540 - 547  2022.10  [Refereed]

    DOI

    Scopus

    4
    Citation
    (Scopus)

  • Combination of Office Work and Working from Home for Improving Well-being

    Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan   2022.8   89 - 92  2022

    DOI

  • Work Environment Considering Emotional Intelligence Quotient of Workers in Hybrid Workstyle

    Kosuke Iihara, Masanari Ukai, Yuta Fukawa, Yuto Chimoto, Takuya Murakami, Shino Kanie, Osamu Kiyota, Osamu Kunitomo, Hitromichi Nishida, Shin Ichi Tanabe

    17th International Conference on Indoor Air Quality and Climate, INDOOR AIR 2022    2022

    　View Summary

    Emotional intelligence quotient (EQ) is defined as the ability to perceive, control, and evaluate emotions. Communication and breaks while working in an office and working from home differ. Therefore, in hybrid workstyle, taking EQ into account and enabling workers with various attributes to work actively is important for creating work environment to improve the workplace productivity. This study aims to identify the effects of differences in the EQ of workers on their ease of activities and workplace productivity in hybrid workstyle for creating work environment to improve the workplace productivity. Regardless of EQ of workers, Questionnaires were conducted during the summer of 2020. The results showed that communication was more difficult while working from home than when working in the office in hybrid workstyle. Additionally, while working from home in hybrid workstyle workers with a high EQ engage in intellectual activities more easily than those with a low EQ.

  • WORKER’S SATISFACTION AND WORKPLACE PRODUCTIVITY IN MEGA PLATE OFFICES WITH ACTIVITY-BASED WORKING

    Yuto CHIMOTO, Masanari UKAI, Shino KANIE, Shigeo OHNO, Yukie OKAMURA, Daisuke NAKAMURA, Shin-ichi TANABE

    Journal of Environmental Engineering (Transactions of AIJ)   86 ( 788 ) 818 - 828  2021.10

    DOI

    Scopus

    5
    Citation
    (Scopus)

  • BUILDING WELLNESS PERFORMANCE AND WORK ENGAGEMENT

    Masanari UKAI, Yuto CHIMOTO, Takuya MURAKAMI, Yuya SUZUKI, Shin-ichi TANABE

    Journal of Environmental Engineering (Transactions of AIJ)   86 ( 781 ) 271 - 278  2021.03  [Refereed]

    DOI

  • Relationship between Emotional Quotient of Workers and Workstyle in Combination of Office Work and Work from Home

    Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan   2021.8   265 - 268  2021

    DOI

  • Required temperature distribution based on clothing insulation and metabolic rate survey in Japan

    Masanari Ukai, Tatsuo Nobe

    Indoor and Built Environment   29 ( 6 ) 775 - 782  2020.07

    　View Summary

    In this study, the authors evaluated clothing insulation and changes in the metabolic rate of individuals in an office environment to determine thermal comfort. Clothing was evaluated using a questionnaire completed by 1306 workers in nine offices. The metabolic rates of 86 workers in three offices were measured using a physical activity meter. The distribution of the temperature at which a person in the room perceived a neutral thermal sensation was then calculated from the determined metabolic rates and clothing insulation values. The results demonstrate a noticeable difference between the average and most frequent values during the summer. Moreover, the required temperature distribution is not normal; rather, it is broad and skewed to the low-temperature side. Therefore, even if a thermally uniform environment is provided at the average required temperature by preventing temporal and spatial variations in the thermal environment, complaints of an unacceptably hot thermal environment are more likely to occur than complaints of an excessively cold thermal environment.

    DOI

    Scopus

    4
    Citation
    (Scopus)

  • Study on Cool Chair equipped with warming function

    Jun Koyama, Yusuke Doi, Masanari Ukai, Tatsuo Nobe

    E3S Web of Conferences   111  2019.08

    　View Summary

    Recent air-conditioning systems aim to provide thermal comfort for an unspecified number of residents. However, office workers may perceive the feeling of comfort differently depending on their clothing, metabolic rate, and personal activity level. This may cause difficulties in maintaining an optimal thermal environment. To address this problem, personal air-conditioning has attracted attention, which is highly versatile and can reduce thermal discomfort and provide comfort to all office workers by enabling individual thermal control. Therefore, the authors focused on developing an office chair, the “Cool Chair”, as a chair-type personal air-conditioning system with a cooling function from 2003 to 2016. The authors then added a warming function for year-round operation, creating the “Cool Chair with Warming Function” in 2017. Subjective evaluation results are reported. These experiments using the new chair indicated that the warming function achieves steady state in 30 minutes and the equivalent temperature of the entire body increases by +2°C. In subject experiments, the warming and cooling functions were adjusted according to individual preferences, and the cooling function was used even during winter by some individuals. The authors also confirmed that the feeling of comfort by the subjects improved at both 19°C and 22°C.

    DOI

    Scopus

    4
    Citation
    (Scopus)

  • Human-oriented design of an indoor thermal environment

    Masanari Ukai, Tatsuo Nobe

    E3S Web of Conferences   111  2019.08

    　View Summary

    In this study, an initial survey of clothing insulation and changes in the metabolic rate of individuals in office spaces was performed to establish the distribution of room temperatures at which individuals perceived a neutral thermal sensation. Subsequently, the indoor thermal environment in four offices was surveyed during the summer with different air-conditioning systems to determine the thermal environment stability in each case. The results revealed that for the required temperature, there was a noticeable difference between the average and most frequent values. Moreover, it was determined that the required temperature distribution is not normal, but rather, it is skewed to the low-temperature side. In addition, the radiant air-conditioning system was found to generate a narrow distribution of the equivalent temperature and hence, facilitated a more uniform thermal environment compared to a convective (multi-unit) air-conditioning system. Therefore, in buildings with convective air-conditioning systems, even if the planar average thermal environment is categorized as comfortable, it may be possible that workers who are sensitive to the cold or heat will complain of discomfort more frequently than those in buildings with radiant air-conditioning systems because the probability of workers sitting in cold- or hot-spot areas is higher in the former case.

    DOI

    Scopus

  • Field study of thermal environment acceptability using ostracon voting device

    Masanari Ukai, Yuta Ichikawa, Tatsuo Nobe

    Proceedings - Windsor Conference 2014: Counting the Cost of Comfort in a Changing World     668 - 677  2019

    　View Summary

    This study aims to assess the thermal conditions of an indoor environment deemed unacceptable by workers. For this purpose, Ostracon, a voting device, was developed to record the physical environment at the time a worker presses a button to express a complaint. Ostracon was used to record the opinions of 90 workers about their thermal environment in six offices during the summer. The results show that workers found the indoor thermal environment unacceptable even when the static thermal conditions were within a range that was predicted to be comfortable. Moreover, most of the workers' complaints were expressed moments after returning from tasks performed outside the office. This suggests that the workers' complaints were influenced by factors other than the indoor environment such as thermal history.

  • Development and evaluation of chair-mounted isothermal airflow generator cool chair 2016

    Masanari Ukai, Gaku Tateyama, Yusuke Doi, Jun Koyama, Tatsuo Nobe

    ECOS 2018 - Proceedings of the 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems    2018

    　View Summary

    In an office space, each office worker has his or her own preference for thermal environmental conditions and personal thermal comfort. Recently, as a solution to such problems, personal air-conditioning systems have attracted much attention to improve the thermal comfort of office workers. Using a personal air-conditioning system, each worker can adjust the thermal environment to his or her desired preference. To create a personal air-conditioning system, the authors enhance an office chair using an airflow generator that has an environment adjustment function. This chair, called a “cool chair,” has been under development since 2003. In this study, the authors develop a new model called cool chair 2016 where thermal environmental selection range is improved. In a physical performance test using a thermal manikin, the equivalent temperature of the entire body was noticeably lower than that of a user seated in a normal office chair. Moreover, the results of a trial test by workers in an office show that workers who used the cool chair felt more comfortable.

  • Operational status evaluation of integrated hybrid VRF system

    Atsushi Hashimoto, Masanari Ukai, Yuma Furuhashi, Ken Yasuda, Tatsuo Nobe

    ECOS 2018 - Proceedings of the 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems    2018

    　View Summary

    Variable refrigerant flow (VRF) systems are used as air conditioning systems in small and medium-sized buildings in Japan. Conventionally, the two most popular types of VRF systems are the Electrical Motor-Driven VRF system (EHP) and the Gas Engine Driven VRF system (GHP). However, in recent years, society has been increasingly demanding energy saving and the best energy mix. This required an air conditioning system that is capable of flexibly using energy according to the application and situation. Consequently, a hybrid air conditioning system (called the Integrated Hybrid VRF system) that satisfies this need was developed. The developed system enables operation in accordance with energy prices and usage situations by connecting a GHP and an EHP in a single refrigerant cycle. Subsequently, in recent years, the Integrated Hybrid VRF system has been utilized in small and medium-sized buildings. However, the actual performance characteristics of this system have not yet been investigated. In this study, measurements were obtained during the actual operation of an Integrated Hybrid VRF system operating in an office building and controlled by a remote monitoring server to enable optimal operation according to the application and situation. In this report, the actual operational status of the Integrated Hybrid VRF system with optimal operational control is presented.

  • Dynamic evaluation method for indoor thermal environmental acceptability using P-R chart

    Masanari Ukai, Tatsuo Nobe

    Proceedings of 10th Windsor Conference: Rethinking Comfort     161 - 175  2018

    　View Summary

    This study was conducted to characterise thermal environmental acceptability for various air-conditioning systems. The authors developed a new thermal comfort index called a P-R chart using the concepts of "provided temperature" and "required temperature" for use in evaluating uniform, high-quality indoor thermal environments and non-uniform, unsteady thermal environments. In this study, first, the authors surveyed the required temperature distribution of workers. Then they surveyed indoor thermal environmental stabilities in the four offices during the summer with different air-conditioning systems to calculate provided temperature distribution. Finally, the indoor thermal acceptability in offices was evaluated using the P-R chart. The results showed that the convective air-conditioning systems caused wide temporal and spatial variations in the thermal environment. Therefore, in buildings with convective air-conditioning systems, even if the planar average thermal environment is categorised as comfortable, it is presumed that workers sensitive to cold or heat will complain of discomfort more frequently than those in buildings with radiant air-conditioning systems and floor-supply displacement HVAC systems, because the probability of workers sitting in cold- or hot-spot areas is higher in the former case.

  • Measurement survey on thermal and acoustic environment in natural ventilating office building

    Gaku Tateyama, Masanari Ukai, Hiroshi Muramatsu, Tatsuo Nobe

    Healthy Buildings Europe 2017    2017

    　View Summary

    The authors investigated an office building in Japan incorporating energy-saving features and environmental technology. The building is medium-sized and incorporates two air-conditioning systems: a natural ventilation system and radiation air-conditioning system. The temperature environment of the building and its psychological effects on office workers were surveyed using a questionnaire. The measurements of the natural ventilation system were made in 2016. The natural ventilation system of this building reduces the indoor temperature by first opening the window. The ceiling uses the heat storage capacity of concrete to retain a low temperature in the room during the night. Air flows through the room with the natural ventilation system. Further, various problems occur because of noise, and the building has a constantly fluctuating environment. However, according to the results, even in such a natural ventilation system in which the indoor environment changes, office workers are able to conduct business without much dissatisfaction.

  • Simplified on-site performance evaluation method for VRF systems

    Yasuhiro Sugata, Mitsuhide Yasuda, Masanari Ukai, Tatsuo Nobe

    Healthy Buildings Europe 2017    2017

    　View Summary

    Few case studies have examined the actual operation of variable refrigerant flow systems. The installation conditions for each case, such as the number of indoor units connected, piping length, height difference, and refrigerant filling budget, are not fixed. Therefore, accurately grasping the changes in performance is difficult. Moreover, specifying the performance evaluation method is necessary because of the complex and diverse operating conditions for each case. The system performance intended by the air conditioning designer/builder is not attained because the actual driving situation differs for each property. Therefore, possible complaints of the system being “too hot” or “too cold” raise a concern.

  • Thermal comfort investigation of air-conditioning system with variable airflow in office

    Takuya Wakao, Masanari Ukai, Tatsuo Nobe

    Healthy Buildings Europe 2017    2017

    　View Summary

    This work clarified the effectiveness and comfort of an air-conditioning system with variable airflow by measurement and questionnaire survey. This air-conditioning system can create horizontal and vertical airflows by a special air outlet. In addition, this system can adjust air volume. Thus, with this system, one can make choices in line with one's airflow preferences, within different air-conditioning zones. Airflow can be set using a five-stage mode, through a user interface that is installed in the room. The measurement results confirmed that air speed difference was attached to each thermal sensation setting, and air volume adjustment functioned effectively. The questionnaire results confirmed that over 90% of officer workers are somewhat comfortable and that the air-conditioning system is extremely comfortable.

  • Comparison between thermal environmental stabilities of radiant and convective air-conditioning systems

    Masanari Ukai, Tatsuo Nobe

    Healthy Buildings Europe 2017    2017

    　View Summary

    Radiant air-conditioning systems and floor-supply displacement heating, ventilation, and air conditioning (HVAC) systems have recently attracted considerable attention. However, such systems have not yet seen widespread use because the degree to which they increase thermal comfort is not clear. In this study, the authors measured the planar thermal deviation during summer in four offices: two offices employed a radiant air-conditioning system and a floor-supply displacement HVAC system, and the other two offices employed convective air-conditioning systems. The results showed that the convective air-conditioning system caused wide temporal and spatial variations in the thermal environment. Therefore, in buildings with convective air-conditioning systems, even if the planar average thermal environment was categorized as comfortable, it was presumed that workers who were sensitive to cold or heat complained of discomfort more often than those in buildings with radiant air-conditioning systems because the probability of workers sitting in cold or hot spots increased.

  • Study on the energy-saving system which using renewable energy for Earth Building TACHIKAWA Part 3 . The Measurement of Thermal Environment and Questionnaire on Comfort in fall

    Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan   2016   273 - 276  2016

    DOI CiNii

  • Study on Probabilistic Thermal Acceptability Evaluation (Part4) Application of P-R chart to Offices in Summer

    Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan   2016   185 - 188  2016

    DOI CiNii

  • Self-stabilizing urban ZEB with high thermal capacity to store renewable energy:Part1.Introduction system and outline of the building

    Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan   2016   305 - 308  2016

    DOI CiNii

  • Part 2. Thermal environment evaluation Self-stabilizing urban ZEB with high thermal capacity to store renewable energy

    Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan   2016   309 - 312  2016

    DOI CiNii

  • 都市における自然エネルギーと躯体熱容量を活用した自律安定型ZEBに関する研究 （第3報）計算モデルによる吸着式冷凍システムの運用法検討

    富樫 英介, 村松 宏, 舘山 岳, 矢田 達也, 鵜飼 真成, 野部 達夫

    空気調和・衛生工学会大会 学術講演論文集   2016   313 - 316  2016

    　View Summary

    <p>研究対象施設にはマイクロコジェネレーションシステムを用いた冷温水供給系統と空気熱源ヒートポンプによる冷温水供給系統がある。両系統の同時起動が不要な低負荷時に、いずれの系統を優先的に起動すべきかは、外界条件や電力およびガス料金などに依存する。本報では簡単なエネルギーフローモデルを作成し、マイクロコジェネレーションシステムと空気熱源ヒートポンプの起動判定を行う方法を示す。</p>

    DOI CiNii

  • Study on Acceptability in Thermal Environment（Part4）Influence of Attribute of Office Worker on Acceptability in Thermal Environment

    Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan   2014   149 - 152  2016

    DOI CiNii

  • Field Study of Thermal Environment Acceptability in Offices Using Ostracon

    Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan   2014   13 - 16  2016

    DOI CiNii

  • Study on Acceptability in Thermal Environment (Part3) Field Study on Unacceptable of Indoor Thermal Environment in Middle Season

    Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan   2014   145 - 148  2016

    DOI CiNii

  • Study on the Air-Conditioning System Corresponding to ZEB

    Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan   2014   117 - 120  2016

    DOI CiNii

  • Study on the Air-Conditioning System Corresponding to ZEB (Part 1)Outline of the Air-Conditioning System, and the Experimental Result of Ambient Air-Conditioning

    Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan   2014   113 - 116  2016

    DOI CiNii

  • ZEBを目指した都市型超高層オフィスビルの研究 （第13報）夏期におけるアンケート調査と受容度申告

    橋本 祐, 伊藤 清, 高 博也, 鵜飼 真成, 高橋 満博, 野部 達夫

    空気調和・衛生工学会大会 学術講演論文集   2014   189 - 192  2016

    　View Summary

    <p>S社本社における執務者の快適性の把握を目的とし,2012年,2013年に実施された夏期アンケート調査,本年度夏期に実施されたオストラコンによる受容度申告調査について報告する。結果として2013年のアンケート調査にあたり,室内設定温湿度が2012年の調査時から変更があったため各項目における回答の変化が認められた。オストラコン調査では温冷感申告,受容申告は快適範囲内外に見られたが,受容申告「受け入れられる」の申告は快適範囲外における申告割合の方が多い結果となった。</p>

    DOI CiNii

  • Research on the Verification of the Component Engineering and its Optimization for Smart Building Construction (Part 2) Study of Gas Consumption of the Waste Heat Recovery Absorption Hot and Chilled Water Generator in the CGS Combination System 2

    Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan   2015   149 - 153  2016

    DOI CiNii

  • Study on simple on-site measurement method of VRF (Part 1) Proposal of measurement using Weighted Average method

    Techinical Papers of Annual Meeting the Society of Heating,Air-conditioning and Sanitary Engineers of Japan   2015   185 - 189  2016

    DOI CiNii

  • A study on probabilistic thermal acceptability evaluation

    Masanari Ukai, Goo Tsusaka, Tatsuo Nobe

    Proceedings - 9th International Windsor Conference 2016: Making Comfort Relevant     985 - 993  2016

    　View Summary

    This study aims to establish a new thermal comfort index for evaluating air-conditioning systems, and introduces a new thermal comfort index for the provided and required temperatures. The authors performed comparison verification experiments on the temperature distribution of radiant air-conditioning and convective air-conditioning systems. The results showed the temperature provided by the convective air-conditioning system to have a wide distribution, unlike that of the radiant air-conditioning system. Based on these results, the authors propose a probabilistic thermal acceptability evaluation using the concepts of "provided temperature" and "required temperature". The authors consider this evaluation method to be applicable for non-steady thermal environments as well as uniform high quality indoor thermal environments using radiant air-conditioning systems, and personalized air-conditioning systems.

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Research Projects

  • Development of Cohort-Based Thermal Comfort Evaluation Methodology

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research

    Project Year :

    2024.04
    -
    2028.03
     

  • Dynamic Evaluation Method for Thermal Comfort

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research

    Project Year :

    2022.04
    -
    2025.03
     

  • ＺＥＢにおけるパーソナル空調の最適設計手法に関する研究

    日本学術振興会  科学研究費助成事業

    Project Year :

    2018.04
    -
    2021.03
     

    鵜飼 真成

    　View Summary

    温熱環境の調整手法が着衣による調整に限られた場合、対流空調の環境下において、等価温度の設定値が26.0℃付近における非受容者率が低いが、それでも30%程度の執務者は熱的な不満を感じていると試算された。一方で、パーソナル空調が使用できる場合、タスク域の環境制御範囲が-1.0℃のケースでは設定等価温度26.5℃付近で非受容者率が20%程度となり、タスク域の環境制御範囲が-3.0℃のケースでは設定等価温度が25.5℃から28.0℃の間であれば非受容者率が10%を下回る試算となった。さらに、アンビエント環境が放射空調の条件では、対流空調の条件と比較して、非受容者率が5%程度低下する試算となった。
    さらに本年度はP-Rチャートによる評価の応用として、国際的に見て一般的な温度帯で運用されているオーストラリアのオフィスと日本のオフィスにおける執務者の着衣量と代謝量から、日豪の夏期オフィスにおける至適温度の違いと快適性の特徴を考察した。日本人は26.5℃付近、オーストラリア人は24.5℃付近において非受容者率が低い結果となったが、その割合については日本人が40%程度、オーストラリア人は20%程度と大きな差が生じた。P-Rチャートから推定された結果は、実際の日豪のオフィスにおける温
    熱環境に対する印象評価ともある程度一致していることから、日本のオフィスのように設定温度を緩和して服装の軽装化を推奨するよりも、オーストラリアのオフィスのように涼しい側の環境で着衣の調整幅を広く持たせる方が快適性は向上すると思われる。

  • Study on Probabilistic Thermal Acceptability Evaluation

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research

    Project Year :

    2016.04
    -
    2018.03
     

Misc

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Syllabus

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Internal Special Research Projects

  • 生体データに基づいたオフィス空間における知的生産性

    2024  

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    本研究は、リストバンド型デバイスを用いて得られた生体データから執務者の精神的状態を推定し、それと主観的な心理申告やモチベーションとの関係を分析したものである。精神的状態は「ストレス・興奮」「集中」「リラックス」「覚醒」の4象限に分類され、脈拍数やLF/HF比を基に時間ごとの変動を可視化した。主観的な申告との比較では、ストレス・興奮やリラックス状態において統計的な整合性が確認され、推定手法の妥当性が示された。一方で、モチベーションとの関係は単純な相関では説明が難しく、変動時の精神的状態の分布が重要とされた。実測データの分析では、モチベーションが向上した場面ではストレス・興奮や集中状態が維持され、特に「仕事の進捗が良い」「集中できる環境」などの心理的要因において顕著であった。対して、歩行や眠気、温熱環境の不満といった生理的要因に関する申告では、モチベーションの低下とともにリラックス状態が増加する傾向が見られた。また、半日単位での申告数と精神的状態の関係から、適度なストレス・興奮はモチベーションを高める一因となりうること、リラックス状態の増加は倦怠感と結びつく可能性が示唆された。これらの結果から、日々の働き方や執務空間が精神的状態の分布に影響を与え、それがモチベーションと密接に関わっていることが明らかとなった。

  • オフィスにおける積極的快適性に関する研究

    2023  

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    本研究では、実際のオフィスにおけるプレザントネスの発生状況の把握、およびプレザントネスが1日を通しての温熱環境評価に与える影響を調査することを目的に、均一な環境を目指した従来型のオフィス（Aオフィス）と環境選択性を備えたオフィス（Bオフィス）を対象に実測調査を行った。1)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Bオフィスでは、定点におけるPMVと温冷感の間に有意な相関が確認されなかった。したがって、環境選択性を備えたオフィスにおいては、定点で測定したPMVを用いて心理量を予測する評価手法は必ずしも適当ではなく、執務者個人の体験した温熱環境や瞬間的な心理量に着目する必要性が示唆された。2)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;リアルタイム快不快感申告時の人体熱負荷の結果から、夏季のオフィスにおいては、涼しい環境の方が気持ち良さを感じやすく、暖かい環境の方が不快を感じやすい傾向が確認された。3)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;快不快申告時の人体熱負荷と申告以前のEMA変化量の関係を分析した結果、気持ち良い申告に関しては、受熱状態で放熱側へと変動している時、または放熱状態で受熱側へと変動している時に多く発生する傾向がみられた。また、不快申告の多くは、申告以前に人体熱負荷が受熱側へと変動したことが原因であった。4)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;均一な環境を目指した従来型のオフィスにおいては、瞬間的な不快を感じないことが重視される一方で、環境選択性を備えたオフィスにおいては、不快の発生そのものではなく、不快を解消できない状態の継続が温熱環境に対する不満につながっていた。5)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;環境選択性を備えたオフィスでは、瞬間的な気持ち良さ、すなわちプレザントネスの発生によって、1日を通しての温熱環境満足度を向上させることが可能であった。したがって、環境選択性を備えたオフィスでは、瞬間的な不快が発生したとしても、執務者自身の環境調整行動により不快を脱却し、プレザントネスを体験することで、温熱環境に対する評価が向上する環境を実現可能であることが示唆された。

  • ひとりひとりが最高の生産性を発揮できるパーソナル空調

    2021  

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    本研究では、執務者が自由に温熱環境を調整できるパーソナル空調に対する動的評価法を考案した。温熱環境の調整手法が着衣による調整に限られた場合、対流空調の環境下において、等価温度の設定値が26.0℃付近における非受容者率が低いが、それでも30%程度の執務者は熱的な不満を感じていると試算された。一方で、パーソナル空調が使用できる場合、タスク域の環境制御範囲が-1.0℃のケースでは設定等価温度26.5℃付近で非受容者率が20%程度となり、タスク域の環境制御範囲が-3.0℃のケースでは設定等価温度が25.5℃から28.0℃の間であれば非受容者率が10%を下回る試算となった。