Impact of different structure of external window on indoor air quality with respect to PM_(2.5) pollution based on infiltration ventilation

摘要

A fast growth of economy in China in recent years has resulted in serious air pollution, which is caused by various air pollutants, in which the fine particulate matter (PM_(2.5)) contributes most due to its impact on both outdoor and indoor air quality and human health. Although closing external windows can help to prevent outdoor PM_(2.5) going into indoors, many studies have shown that there are still a number of particles that can go inside the room thorough cracks on the building facade by infiltration, and this may also cause unacceptable indoor air quality. For a given pressure difference between the two sides of an external window, the indoor PM_(2.5) mass concentration is mainly influenced by the crack structure of the external window and also the room dimension. In order to quantify the influence of various crack structures of external windows on the indoor level of PM_(2.5), a model coupled with window crack structure and room dimension for predicting the indoor PM_(2.5) mass concentration was developed. The model can be used in further research exploring the correlation between indoor and outdoor PM_(2.5) concentrations and can also help to develop approaches to promote the barrier property of external windows on PM_(2.5).