室外细颗粒物(PM2.5)计算质量浓度确定方法探讨

Discussion on determination method of mass concentration calculation of outdoor fine particulate matter(PM2.5)

基于北京地区2014年1月1日至2016年12月31日室外PM2.5小时平均值和日平均值质量浓度数据,采用日平均质量浓度统计法与小时平均质量浓度统计法,比较分析了3种常用统计计算方法(历年不保证天数法、累年不保证天数法、历年不保证小时数法)的统计计算结果对新风过滤装置设计选型的影响。研究结果表明:关于室外PM2.5计算质量浓度值,对于新风过滤系统,建议按历年不保证小时数法确定;对于以白天工作为主的场所(如学校、办公建筑等),建议按照历年不保证小时数法的白天时段(07:00至次日19:00)的统计计算结果取值;对于室内环境质量要求较高或全天候或夜间工作为主的场所,建议按照历年不保证小时数法的夜间时段(20:00至次日06:00)的统计计算结果取值。

Based on the outdoor hourly mean mass concentration and daily mean mass concentration data in Beijing from January 1, 2014 to December 31, 2016, compares and analyses the impacts of the statistical calculation results using three common statistical calculation methods (annual non-guaranteed number of days, normal non-guaranteed number of days and annual non-guaranteed number of hours) on the design and selection calculation of the outdoor air filter. The results show that the annual non-guaranteed number of hours is suggested to determinate outdoor PM2.5 calculation mass concentration for the outdoor air filtration system, the annual non-guaranteed number of hours (during the day time 07:00-19:00) is suggested for the place where working mostly during the day, and the annual non-guaranteed number of hours (during the night time 20:00-06:00) is suggested for the place where high environment required and working all the day and night or during the night.