Simulation research on operation optimization of air purifiers

Simulation method is adopted to analyse the optimization of ventilation and purification operation strategy of residential buildings, and study the effects and the interaction of the initial value of indoor PM2.5 concentration, outdoor PM2.5 pollution level, room ventilation, the amount of clean air (CADR), the operation mode of air purifiers (continuous and intermittent operation) and room volume on indoor PM2.5 concentration. The results show that, when the outdoor PM2.5 pollution level is serious, severe and moderate, the window should be closed to reduce the ventilation rate. When the outdoor air is slightly polluted or fine, the window can be properly opened to increase the amount of ventilation rate to 2.0 h-1 in the case of not too cold. On the other hand, in order to ensure the purification effect in real time, simultaneously avoiding the excessive selection of air purifiers and the increase of initial investment in purification equipment, and improving the operating efficiency of the air purifier, the air purifier should be operated continuously. Under this ventilation and purification strategy, if the PM2.5 concentration is lower than 35 μg/m3, the minimum required CADR are 90, 120, 150, 150 m3/h for 9, 12, 15, 18 m2, respectively. In addition, turning on the air purifier before outdoor PM2.5 pollution makes no difference on indoor PM2.5 concentration when the initial indoor PM2.5 concentration is less than 35 μg/m3. However, if it is higher than 35 μg/m3, try to turn on the indoor purifier 60 min in advance.