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

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14306
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 23020:Architectural environment and building equipment-related
• Research Institution: Kyushu 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
• 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

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.

Free Research Field

建築環境工学

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．