空气过滤器设计选型用PM_(2.5)室外设计浓度确定方法

Determination of PM_(2.5)Outdoor Design Concentration for Air Filter Design and Selection

PM_(2.5)室外设计浓度是空气过滤器设计选型中的重要参数,然而目前却没有统一的确定方法。本文的目的是提出一个通用、便捷的方法并能合理确定PM_(2.5)室外设计浓度。在统计并分析了2014年我国29个城市空气质量的情况下,阐述了过滤器选型的基本方法及存在的问题;结合保证率的概念提出了1种PM_(2.5)室外设计浓度的确定方法。结果表明,不同城市PM_(2.5)污染程度差别较大,其年均值范围为32~123μg/m^3。利用PM_(2.5)年均值作为室外设计浓度,全年30%~40%的天数无法使室内PM_(2.5)浓度达到设计要求。各城市PM_(2.5)污染的多样性为过滤器的设计选型带来了一定的困难,而利用基于保证率的PM_(2.5)室外设计浓度确定方法绘制保证率曲线,可根据不同保证率要求方便快速地查得PM_(2.5)室外设计浓度。

PM2.5 outdoor design concentration is a key parameter in the process of air filter design and selection, but there is no unified method available for determination. The purpose of this paper is to present a common and simple method to address the problem. Ambient air quality of 29 Chinese cities in 2014 was analyzed, and then, the basic method of air filter design and selection was introduced, together with the problems presented. Furthermore, based on the concept of guarantee rate, a determination method was put forward. The results show that different cities have different PM2.5 pollution levels, and the annual mean value of PM2.5 ranges from 32 μg/m3 to 123 μg/m3. With the annual mean value as the outdoor design concentration, there are 30% ~40% of the days in a year cannot meet the requirements for indoor PM2.5 concentration limitation set in the design stage. The various PM2.5 pollution levels led to difficulty in the design and selection of air filter. Using the determination method of PM2.5 outdoor design concentration based on guarantee rate, a corresponding curve can be drawn. And then, the PMz.s outdoor design concentration can be quickly obtainable according to different requirements for guarantee rate.