三、车体隔热性能从车辆采暖热平衡方程式中可以看出,由客车内部向车外传递的热量由两部分组成,一是通过车体隔热壁传出的热量Q_5,二是因通风换气所引起的热损失Q_6。通风换气对于冬季运用的客车是非常必要的,而且所引起的热损失也比较大。但由于我国绝大部分客车均未装设机械通风装置,通风量无法控制。而且为了保持车内温 Third, the body insulation properties From the vehicle heating balance equation can be seen from the bus to the outside of the vehicle to pass the heat from the two components, one through the car insulation wall heat Q_5, the second is due to ventilation Gas heat loss caused by Q_6. Ventilation for the use of the bus in winter is very necessary, but also caused by the heat loss is relatively large. However, due to the vast majority of China’s passenger car are not equipped with mechanical ventilation, ventilation can not control. And in order to keep the car warm