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The effect of horizontal elements and building orientation on PM_(2.5)concentration in classrooms

Frontiers of Architectural Research 2023年第4期12卷 775-787页

作者： Nachawit Tikul Apiruk Hokpunna Panphat Chawana Faculty of Architecture and Environmental Design Maejo UniversityChiang Mai 50290Thailand Faculty of Engineering Chiang Mai UniversityChiang Mai 50290Thailand Chiang Mai Primary Education Service Area Office 2 Office of the Basic Education CommissionChiang Mai 50290Thailand

This study aimed to evaluate the effect of horizontal elements and building orientation on indoor particulate matter with a diameter of less than 2.5 mm(PM_(2.5))concentration and airflow.We added horizontal elements to the envelope of a standard Thai school building using computational fluid dynamics for testing the dispersion and concentration of PM_(2.5)in classrooms under the PM_(2.5)crisis condition in Chiang Mai Province.The results showed that the building orientation and the addition of horizontal elements to the front wall of the school building had different effects on the concentration of PM_(2.5)and airflow within the classroom in eight directions.Classrooms in standard school buildings facing NE and SW directions had the highest indoor PM_(2.5)concentrations,and those facing NW and SW had the least compared to all directions.Adding horizontal elements on the front wall of the standard school building was found to reduce the PM_(2.5)concentration in the classrooms of the building facing the N,NE,E,and SE directions.Increasing the horizontal element width from 1 m to 2 m reduced the PM_(2.5)concentration in classrooms of the N-and SE-facing buildings but had little effect in the classrooms of the NE-and E-facing buildings.This study will provide insight into the optimization of air quality in school buildings,informing the decision-making for adding horizontal elements and controlling their widths.

关键词： PM_(2.5) horizontal element Orientation Classroom Computational fluid dynamics

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