制冷系统中,除制冷剂外,尚有部分混合气体,在冷凝压力和温度下是不凝结的,统称不凝性气体,简称空气。它的主要成分是空气,此外还可能有制冷剂及冷冻油的分解物。虽然这些空气的数量不多,但由于空气在冷凝器内冷却管组表面形成气体层,对传热产生较大热阻,使冷凝器的传热效率降低,从而使冷凝压力和温度升高。由于冷凝压力的升高,导致压缩机的排气压力升高,输气系数降低,输气量减少,耗电量增加,从而使压缩机的 Refrigeration systems, in addition to the refrigerant, there are still some mixed gases, condensing pressure and temperature is not condensed, collectively referred to as non-condensable gases, referred to as air. Its main ingredient is air, in addition there may be refrigerant and frozen oil decomposition. Although the amount of air is small, the air forms a gas layer on the surface of the cooling pipe group in the condenser, which causes a large thermal resistance to heat transfer, which reduces the heat transfer efficiency of the condenser and increases the condensing pressure and temperature. As the condensing pressure increases, resulting in the compressor exhaust pressure increases, the gas transmission coefficient is reduced, reducing gas transmission, power consumption increases, so that the compressor