通过对单级压缩与双级压缩实际制冷循环系统各过程火用损失的计算 ,找出循环过程的薄弱环节 ,提出改进循环热力特性的可行性 ,得出单级压缩制冷循环中蒸发器火用损最大 ,冷凝器火用损次之 ,双级压缩制冷循环中压缩机火用损最大 ,蒸发器火用损次之 ,并对提高循环效率进行了分析与探讨 Through the calculation of the exergy loss of single-stage compression and two-stage compression in the actual refrigeration cycle, the weakness of the cycle is found and the feasibility of improving the thermal performance of the cycle is put forward. The single-stage compression refrigeration cycle of the evaporator The largest loss of the condenser, the loss of the condenser, the compressor compression loss in the two-stage compression refrigeration cycle, the loss of the evaporator, and to improve the cycle efficiency analysis and discussion