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。

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