严寒地区被动房室内PM2.5质量平衡模型与分析OA

The lumped parameter method was adopted to establish a mass balance model for indoor PM2.5 in passive houses.Two typical passive houses in severely cold regions were selected as study subjects.Through on-site measurements including the CO2 decay method and continuous monitoring,model parameters(air ex-change rate,characteristic parameters of the fresh air system,PM2.5 deposition rate,PM2.5 penetration coef-ficient,and source strength)were determined.The re-lationship between the characteristic parameters of the fresh air system and outdoor PM2.5 mass concentration was established.The penetration coefficients and depo-sition rates of the two passive houses are relatively close,with an average indoor PM2.5 deposition rate of 0.02 h-1 and an average penetration coefficient of 0.30,both lower than those of conventional houses and previ-ous test results.The measured value of the characteris-tic parameter of the fresh air system is 1.30±0.12,indi-cating that the existing M5 medium-efficiency filters cannot effectively intercept PM2.5.The established in-door PM2.5 mass balance model and the key param-eters obtained from field measurements are reasonable.