Analysis of the effect of air purification equipment on indoor pollutants in Northeast China in winter

In this study, 3 residential buildings with installed high-efficiency filter fresh air system, coarse-efficiency filter fresh air system and air purifier were selected respectively to analyze the purification effect of different air purification equipment on indoor pollutants in winter. Data on ventilation and concentrations of PM2.5 and CO2 were collected through long-term online monitoring. The test results showed that under the same outdoor pollution condition, the average indoor PM2.5 concentration of residential buildings equipped with high-efficiency filter fresh air system and air purifier was 33.62μg/m3 and 34.32μg/m3, respectively. However, the purification effect of coarse-efficiency filter fresh air system was poor, and the indoor PM2.5 concentration over-standard rate reached 13.11%. It was a slow process for the fresh air system to reduce indoor CO2 concentration. The fresh air system needed to be opened continuously for 4 hours to stabilize the CO2 concentration, and the decrease rate could reach 53.6%. Whereas, it took only 14 minutes for natural ventilation to reduce the indoor CO2 concentration by 54.3%, but the window opening time was limited in winter. The use of high-efficiency filter fresh air system can ensure indoor comfort and maintain concentration of indoor pollutants at a low level in winter.