| In recent years,the pollution of outdoor atmospheric particulates in our country is serious.Most cities are affected by fog and haze weather,causing great harm to people's health and life.In today's society,people spend more than 80%of their time building indoors,and indoor air quality has a great impact on human health.Therefore,the relationship between indoor and outdoor particulate matter concentration and outdoor weather parameters of indoor and outdoor particulate matter concentration has become an urgent problem to be solved.At present,little research has been done on the relationship between indoor and outdoor particulate matter concentration and concentration in office buildings in cold regions in China.In order to clarify the interactive relationship between indoor and outdoor particulate matter concentration and concentration in office buildings in cold regions,the quality concentration of indoor and outdoor particles of two office buildings in a university in shenyang city was measured in 2016-1-09 to 2016-1-22,2016-7-08 to 2016-8-03 and 2017-2-28 to 2016-3-13.Based on the measured data,Fluent software was used to simulate the gap of the envelope with different geometric shapes and sizes.The main conclusions are as follows:(1)Comparison of the daily mean values of the three measured indoor and outdoor particulate matter concentrations:winter 2015(peak heating period)>winter 2015(at the end of the heating period)>summer 2016;compare the mass concentration of A and B in the measured point:Measured point A<Measured point B,mainly because the air tightness of measuring point A(level 8)is better than that of measuring point B(level 4).(2)Comparison of three measured I/O ratios:Winter 2015(peak heating period)>Summer 2015>Winter 2016(at the end of the heating period),when the indoor of the building is exposed to a high concentration of outdoor particles for a long time,indoor particles will reach a higher concentration;compare the I/O ratio of measuring point A and measuring point B:Measuring point A<Measuring point B.(3)Comparing the correlation between three measured indoor and outdoor particle mass concentrations:2015 winter>2015 winter>2016 summer,and all had a significant positive correlation with the confidence level of 0.01.(4)Comparison of the maximum indoor concentration in three indoor buildings:2015 Winter<Winter 2015<Summer 2016,compared with the maximum outdoor concentration at point A and point B:point A>point B.(5)There was a significant negative correlation between the outdoor wind speed and the indoor and outdoor particulate matter concentration during the measurement period.The relative humidity was positively correlated with the indoor and outdoor particulate matter concentration.The outdoor temperature was negatively correlated with the indoor and outdoor particulate matter concentration.(6)From the results of Fluent simulation,it is found that the larger the height of the gap H,the larger the pressure difference AP on both sides of the gap,the higher the particle penetration rate.The longer the gap depth d,the smaller the particle penetration rate is;the larger the number n of the crevices is,the smaller the particle penetration rate is.The results of the study can help people to effectively understand and control the impact of outdoor particulate matter on indoor air quality,provide a basis for the prediction of indoor indoor airborne particulate matter concentration concentration,and have theoretical practical significance. |
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