| Natural ventilation,as a method of providing fresh air without consuming electric energy,creating comfortable indoor thermal environment and good air quality,has attracted the attention of many researchers.The use of natural ventilation is affected by many factors,such as outdoor climate,outdoor pollution,etc.How to integrate many influencing factors to evaluate the potential of natural ventilation and make better use of natural ventilation is a problem worthy of attention.This study considered the climatic characteristics of various climate zones in China and the impact of outdoor PM2.5concentration on natural ventilation.Shenyang,Beijing,Chongqing,Shanghai,Guangzhou,and Kunming were selected as the representative cities of each climate zone,and the natural ventilation potential of each city was evaluated.First,the study analyzed the changes of outdoor PM2.5 in each city in recent years by collecting a large number of outdoor PM2.5 monitoring data from weather station in each representative city,and selected the typical year data of outdoor PM2.5 in each city as the basic data for analyzing the impact of outdoor PM2.5 on the natural ventilation potential.Secondly,on-site monitoring of indoor personnel activities and indoor and outdoor environment of a typical office building in Chongqing,through the analysis of the annual indoor and outdoor PM2.5 measured data,verified the rationality of the established typical annual PM2.5 data changes;passed Monitoring personnel’s annual room rate and window opening and closing and other adaptive behavior adjustments,based on the adaptability of personnel,the lower limit of the annual acceptable temperature in colder months is around 16℃,and the upper limit of warmer months is between 28～32℃,To provide a certain reference for the following simulation of boundary conditions and the proposed comprehensive evaluation method of natural ventilation potential based on human thermal adaptation.Finally,by reviewing the methods used in the existing natural ventilation potential evaluation research,we proposed a natural ventilation potential evaluation method that comprehensively considers the impact of climate and outdoor PM2.5 on natural ventilation.This method uses adaptive thermal comfort model for different climate regions in China to restrict the indoor temperature during natural ventilation and uses the PM2.5 concentration limit to restrict the indoor PM2.5 concentration.Energy Plus software was used to simulate the indoor temperature and PM2.5 concentration of office buildings in representative cities during natural ventilation,and analyze the influence of climate factors on the indoor thermal environment when natural ventilation is used in different climate zones and the influence of outdoor PM2.5 on the indoor environment.And the natural ventilation potential of these cities was evaluated based on the proposed natural ventilation potential assessment method.It is concluded that when only considered climate,cities with less cooling and heating demand had larger natural ventilation potential;when considered both climate and outdoor PM2.5,the cities with high outdoor PM2.5 concentration and the pollution appeared at time when season are suitable for natural ventilation,PM2.5 has a greater impact on natural ventilation.Considering climate and PM2.5 pollution and limit the indoor PM2.5 concentration less than 35μg/m3,the natural ventilation potential is ranked as follows: Kunming>Guangzhou>Chongqing>Shanghai> Shenyang>Beijing.The time that cities cannot use natural ventilation due to climatic factors accounts for 42% to 61% of the total working hours,and the loss of natural ventilation potential due to outdoor PM2.5 can reach 3% to 23%. |
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