一种四级自动复叠制冷系统混合工质组分选取及配比研究

Study on Mixed Refrigerants Selecting and Matching of a Four Stage Auto-cascade Refrigeration

对于多级自动复叠制冷系统,混合制冷工质的选取和组分配比具有重要的影响作用。针对四级自动复叠制冷系统,运用REFPROP8.0软件建立了混合工质种类选择及其配比研究的理论模拟方法,通过分析比较混合工质的饱和压力、蒸发温度,模拟出混合工质组分和配比:R600a/R23/R14/R740=45/21/19/16,充入该混合工质配比进行实验研究,获得了-150℃的设计柜温。研究表明,该混合工质理论模拟方法,能够有效指导实验研究,取得理想的制冷温度。

The selection and mixture ratio of the mixed refrigerants are important to a muhistage auto-cascade refrigeration system. A simulation method was found for the mixed refrigerants selection and ratio calculation by using the commercial software REFPROP8.0. The saturation pressure and evaporation temperature of the auto-cascade refrigeration system were compared to get the optimal mixture ratio of the mixed refrigerants, that is R600a/R23/R14/R70 =45/21/19/16. The temperature of freezer was - 150℃ at this mixed refrigerants and the mixture ratio. The results show that the research of multistage auto-cascade refrigeration system can be guided by this simulation method and the expected temperature was got.