Usage behavior of residential outdoor air system and its influencing factors: A case study of transitional seasons in Beijing

 The usage behavior of residential outdoor air system directly affects indoor air quality, thermal comfort and building energy consumption. Selects four households in Beijing and measures the usage behavior of outdoor air system during transitional seasons. Finds that using the outdoor air system can improve indoor air quality significantly. However, the residential outdoor air system is not open for 24 hours. Puts forward the concepts of opening duration and opening probability to quantitatively evaluate the usage behavior. Concludes that the average daily opening duration is 16.5 hours and the average opening probability is 70.6%. The outdoor PM2.5 concentration is a key factor that affects the usage behavior of outdoor air system. When the outdoor PM2.5 mass concentration is greater than 125 μg/m3, the open probability of outdoor air system is basically close to 100%; when it is less than 125 μg/m3, the usage behavior of outdoor air system is random. Through binary logistic regression modeling and analysis, it is found that the maximum environmental factors that affect the usage behavior of outdoor air system of different households are different. It is indoor temperature for active households and outdoor PM2.5 concentration for inactive households.