Impact of the external window crack structure on indoor PM2.5 mass concentration. (1st November 2016)

• Record Type: Journal Article
• Authors: Chen, Ziguang; Chen, Chao; Wei, Shen; Wu, Yuqin; Wang, Yafeng; Wan, Yali
• Is Part Of: Building and environment. Volume 108(2016)
• Page Start: 240
• Page End: 251
• Publication Date: 2016-11-01
• Subjects: Air pollution -- PM2.5 -- Window crack structure -- Infiltration -- PM2.5 modeling; Buildings -- Environmental engineering -- Periodicals; Building -- Research -- Periodicals; Constructions -- Technique de l'environnement -- Périodiques; Electronic journals; 696
• DOI: 10.1016/j.buildenv.2016.08.031
• Languages: English
• ISSNs: 0360-1323

Abstract

Abstract: The fine particulate matter, generally known as PM2.5, has great impact on the air quality and human health. Although closing external windows can help prevent outdoor PM2.5 going into indoors, many studies have shown that a significant number of particles can still pass the building façade through the cracks around the window. In order to quantify the influence of the external window crack structure and some relevant parameters, such as room dimension, on the indoor PM2.5 mass concentration, this paper introduces an updated model from a previously published paper by the authors [18]. The model was developed based on two-month field measured data from five unoccupied offices located in the central area of Beijing (capital city located in northern China), and then was validated against a new dataset measured in Guangzhou (a major city located in southern China). The model can be used to quantify the indoor PM2.5 mass concentration based on the instant outdoor PM2.5 level, considering influences from external window crack structure, room dimension and outdoor meteorological conditions, i.e. outdoor wind speed and relative humidity. Highlights: An updated method predicting indoor PM2.5 mass concentration has been proposed. PM2.5 concentration prediction considering window and room structural properties. For indoor PM2.5, window properties are more important than room properties. The impact of various window air-tightness levels on indoor PM2.5 was quantified.