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Quantitative investigation of non-uniform and transient CO2 concentration distribution in breathing zone for advanced indoor environmental design

Research Project

Project/Area Number 21K14306
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 23020:Architectural environment and building equipment-related
Research InstitutionKyushu University

Principal Investigator

Yoo Sung-Jun  九州大学, エネルギー研究教育機構, 准教授 (30783394)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords二酸化炭素 / 呼吸空気質 / 数値人体モデル / 数値気道モデル / 計算流体力学 / 空調制御 / CFD / 被検者実験 / 呼吸
Outline of Research at the Start

本研究では「人体呼吸域内の不均一・非定常二酸化炭素濃度場の定量的理解と室内環境設計の高度化」と題して,呼気と吸気を繰り返す非定常呼吸に伴い人体呼吸器系に出入りする二酸化炭素に着目し,呼吸域周辺に形成される非定常・不均一な二酸化炭素濃度場を高い精度で定量的に予測・評価可能な数値解析モデルを開発する.その上,在室者が実際に呼吸する,もしくは呼出する二酸化炭素濃度の実態を定量的に検討すると共に,本数値解析モデルを基盤とする空調制御シミュレーションにより呼吸域内の二酸化炭素の挙動や吸入リスクに関する基礎データを構築し,在室者の二酸化炭素吸入リスクの低減に主眼を置いた新たな室内環境設計技術を提案する.

Outline of Final Research Achievements

In this study, three detailed objectives were set and research was advanced in order to quantitatively elucidate the time-dependent changes in the concentration of carbon dioxide in the breath exhaled from the nose and mouth and the time-dependent changes in the concentration of carbon dioxide that actually flows into the respiratory system (inhalation), and to establish new air conditioning design guidelines.
The results of this study indicate that a large amount of parametric analysis of air conditioning control simulations based on the numerical analysis model constructed in this study can provide basic data on the behavior of carbon dioxide in the respiratory zone and the risk of inhalation, and that this can contribute to the establishment of new indoor environmental design techniques that focus on reducing the risk of carbon dioxide inhalation by occupants.

Academic Significance and Societal Importance of the Research Achievements

現在の室内環境設計法が,室全体の均一制御から,パーソナル空調に代表される局所領域と在室者(人)の精緻な制御へと大きなパラダイムシフトを迎えているにも関わらず,直接的な環境制御の対象となる在室者由来の二酸化炭素発生モデルの高精度化が図られていないが故,設計精度向上のボトルネックになっていることが懸念されている.呼吸域内の不均一・非定常二酸化炭素濃度場の定量的解明は,建築環境工学分野の研究者の貢献が求められている重要かつ喫緊の研究課題であるため,本研究の成果は学術的価値に加えて社会的貢献度も高いものと期待している.

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (12 results)

All 2024 2023 2022

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 3 results) Presentation (6 results) (of which Int'l Joint Research: 6 results)

  • [Journal Article] Effect of crowd density, wind direction, and air temperature on the formation of individual human breathing zones in a semi-outdoor environment2024

    • Author(s)
      Abouelhamd Islam.M.S.、Kuga Kazuki、Yoo Sung-Jun、Ito Kazuhide
    • Journal Title

      Sustainable Cities and Society

      Volume: 103 Pages: 105274-105274

    • DOI

      10.1016/j.scs.2024.105274

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Integration of computer-simulated persons with multi-node thermoregulation model that considers the effect of clothing for skin surface temperature distribution analysis2024

    • Author(s)
      Park Hyungyu、Yoo Sung-Jun、Seo Janghoo、Eisaku Sumiyoshi、Hiroshi Harashima、Kuga Kazuki、Ito Kazuhide
    • Journal Title

      Building and Environment

      Volume: 248 Pages: 111105-111105

    • DOI

      10.1016/j.buildenv.2023.111105

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Identification of probabilistic size of breathing zone during single inhalation phase in semi-outdoor environmental scenarios2023

    • Author(s)
      Abouelhamd Islam、Kuga Kazuki、Yoo Sung-Jun、Ito Kazuhide
    • Journal Title

      Building and Environment

      Volume: 243 Pages: 110672-110672

    • DOI

      10.1016/j.buildenv.2023.110672

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Computational Fluid and Particle Dynamics Analyses for Prediction of Airborne Infection/Spread Risks in Highway Buses: A Parametric Study2023

    • Author(s)
      Yoo Sung-Jun、Yamauchi Shori、Park Hyungyu、Ito Kazuhide
    • Journal Title

      Fluids

      Volume: 8 Issue: 9 Pages: 253-253

    • DOI

      10.3390/fluids8090253

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spatial distributions of airborne transmission risk on commuter buses: Numerical case study using computational fluid and particle dynamics with computer-simulated persons2023

    • Author(s)
      Yoo SJ, Kurokawa A, Matsunaga K, Ito K.
    • Journal Title

      Experimental and Computational Multiphase Flow

      Volume: 0 Issue: 3 Pages: 1-15

    • DOI

      10.1007/s42757-022-0146-6

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Validation, verification, and quality control of computational fluid dynamics analysis for indoor environments using a computer-simulated person with respiratory tract2022

    • Author(s)
      Yoo SJ, Ito K.
    • Journal Title

      Japan Architectural Review

      Volume: 5 Issue: 4 Pages: 714-727

    • DOI

      10.1002/2475-8876.12301

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Investigation of the impact of the detailed clothing modelling on the human thermal comfort based on multi-node thermoregulatory analyses using computer-simulated person2023

    • Author(s)
      Hyun-Gyu Park, Sung-Jun Yoo, Eisaku Sumiyoshi, Hiroshi Harashima, Kazuhide Ito
    • Organizer
      Healthy Building 2023 Asia Pacific
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical Thermal Comfort Analysis Using Combined Computer-Simulated Person with Clothing and Multi Node Thermoregulation Model2023

    • Author(s)
      Park Hyun-Gyu, Yoo Sung-Jun, Sumiyoshi Eisaku, Harashima Hiroshi, Ito Kazuhide
    • Organizer
      IAQVEC 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical prediction of particle breathing zone in a semi-outdoor environment2023

    • Author(s)
      Islam Abouelhamd, Sung-jun Yoo, Kazuki Kuga, and Kazuhide ito
    • Organizer
      ICNAA 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Development of three-dimentional clothing model for computer simulated person integrated with thermoregulation model2022

    • Author(s)
      Sena Hyodo, Kei Murota, Sung-Jun Yoo, and Kazuhide Ito
    • Organizer
      Roomvent 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Indoor Thermal Comfort Assessment Using CFD-CSP Hybrid Analysis2022

    • Author(s)
      Hyun-Gyu Park, Sung-Jun Yoo, Eisaku Sumiyoshi, Hiroshi Harashima and Kazuhide Ito
    • Organizer
      ACFD 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Three-Dimensional Modeling and Computational Fluid Dynamics Analysis for Ventilation in Clothing2022

    • Author(s)
      Sena Hyodo, Sung-Jun Yoo and Kazuhide Ito
    • Organizer
      ACFD 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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