Development of a prediction method for unsteady ventilation rate within urban buildings

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14305
• 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: Fukuoka Institute of Health and Environmental Sciences (2023); Kyushu University (2021-2022)
• Principal Investigator: Hirose Chiyoko 福岡県保健環境研究所, その他部局等, 主任技師 (10897656)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 通風換気量 / 非定常都市気流場 / 非定常流体解析 / PIV計測 / 屋外観測

Outline of Final Research Achievements

In our modern society accelerating the trend for energy conservation in building operations, there is a significant social demand for improving the accuracy of ventilation estimation methods to promote the introduction of natural ventilation system, which is gaining attention due to its passive nature. Although natural ventilation phenomena have used to be treated in a microscopic and static manner, this study reexamines it as cross-scale fluid phenomena within the continuity of urban spaces. By conducting numerical simulations and wind tunnel experiments targeting airflow fields around reduced-scale urban building models, and outdoor observations in a real city area, we investigated the relationship between the spatial and temporal distributions of urban airflow excited by surrounding buildings and atmospheric disturbances and the corresponding ventilation phenomena.

Free Research Field

建築環境工学

Academic Significance and Societal Importance of the Research Achievements

本研究課題は，都市幾何形状に依存した様相を呈するとされる都市気流場が建物換気の時空間動特性の形成に寄与しているのではないかといった学術的「問い」を主題とすることで，換気研究において慣習的に援用されてきた微視的で静的な現象理解からの脱却を志向するものある．研究分野間の橋渡しとなる境界領域での知見整備を志向している点において学術的独自性を有するだけでなく，建物運用における省エネルギー化の観点から換気量推定手法の高精度化に対する社会要請が極めて高いことを鑑みると，社会的インパクトもが期待される．