ANALYSIS OF ZEOTROPIC MIXTURES USED IN LOW TEMPERATURE SOLAR RANKINE CYCLE SYSTEM Identification of pinch point in countercurrent heat exchanger for zeotropic refrigerant mixtures 非共沸工质用于太阳能低温朗肯循环的理论研究非共沸制冷剂在逆流换热器中温度窄点出现的判别方法
It is shown that the-40 ℃ freezer using zeotropic refrigerant mixture of R744/ R717 has high COP of 0.71 while keeping the compressing ratio less than 8. It is a promising refrigeration system. 结果表明:采用非共沸环保混合制冷剂(R744/R717)-40℃低温冷柜自然复叠制冷系统在保持压缩比小于8的同时能获得COP值高达0.71,是一个有发展前途的制冷系统。