| 摘要(英) |
The natural ventilation of buildings can bring in the fresh air, dilute indoor air pollutants, and improve indoor thermal comfort. However, outdoor air may also bring pollutants into the buildings. The particular matter is one of the pollutants that could significantly affect indoor air quality. Therefore, it is necessary to have a deeper understanding of the relationship between natural ventilation and pollutant transport mechanisms. This study uses a computational fluid dynamics (CFD) model to investigate how the outdoor particulate pollutants enter naturally ventilated buildings. The research results show that and the ventilation rate and the entrance rate of outdoor PM pollutants decrease when the length of the building increases. In addition, the deposition rate of indoor PM2.5 rises with the increasing building length due to the stagnant air inside the long buildings. Furthermore, when the pollution source is located in the street canyon, the ventilation rate of downwind buildings and the entrance rate of PM pollutants decrease as the building spacing S decreases. But when the building spacing S/H = 2, the wind speed between buildings is very weak, the PM pollutants stay in the street canyons longer, and the pollutants have a higher chance of entering the building. |
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