蒸发温度 evaporating temperature 冷凝压力 condensing pressure 冷凝温度 condensing temperature 吸气温度 suction temperature 回气温度 back temperature 排气温度 discharge temperature 压缩比 compression ratio 双效压缩 dual compression 单级压缩 single-stage compression 双级压缩 compound compression 多级压缩 multistage compression