冷藏汽车隔热车厢总会有泄漏现象,在使用时造成车厢内外的换气,这是很不利的:渗入空气与厢内空气的焓差将使耗冷量增加;湿空气渗入会导致车厢总传热系数(K 值)增大,加速车厢隔热层老化,还会使蒸发器霜层加厚,增加融霜次数,加快腐蚀;严重的局部泄漏会使厢内温度不均匀,进而引起易腐货物变质。因而,为改善车厢的密封性能,隔热车厢的气密性试验很为重要。据国际制冷学会1972—1973年对13个国家24 There is always a leakage phenomenon in the compartment of a refrigerated automobile. In use, the ventilation inside and outside of the vehicle is caused. This is very unfavorable: the enthalpy difference between the infiltration air and the cabin air will increase the cooling consumption, and the infiltration of moist air will cause the total cabin Heat transfer coefficient (K value) increases, accelerates the insulation layer aging, but also to thicken the evaporator frost layer, increasing the number of defrost, speeding up corrosion; severe local leakage will make the car temperature is uneven, and then cause easy Rotten goods deterioration. Therefore, in order to improve the sealing performance of the compartment, the air tightness test of the insulated compartment is very important. According to the International Society for Refrigeration 1972-1973 to 13 countries 24