根据房间通风效率 ,计算了常见的混合式通风系统的污染物稳定浓度 ,定量分析了影响稳定浓度的因素 ,如通风效率、预处理设备的效率、回风率等。认为就给定系统而言 ,提高通风效率特别是相对效率、提高送风量、设置空气预处理设备是降低室内污染物浓度、降低新风量的有效措施 According to the room ventilation efficiency, the stable concentrations of pollutants in the common mixed ventilation system are calculated, and the factors affecting the steady concentration are quantitatively analyzed, such as the ventilation efficiency, the efficiency of the pretreatment equipment and the return air rate. It is considered that for a given system, improving ventilation efficiency, especially relative efficiency and air supply, setting air pretreatment equipment is an effective measure to reduce indoor pollutant concentration and reduce fresh air volume