复叠式制冷系统中R744替代R23的理论分析  

Theoretical Analysis of R744 Instead of R23 in Cascade Refrigeration System

作　　者：梁容真 阎富生 LIANG Rongzheng;YAN Fusheng(Northeastern University, Shenyang 110819, China)

机构地区：[1]东北大学冶金学院,沈阳110819

出　　处：《制冷》2018年第3期11-18,共8页Refrigeration

基　　金：辽宁省教育厅资助项目(L20150179)

摘　　要：本研究对复叠式制冷系统R744/R404A和R23/R404A进行了理论与对比分析。分析了高低温压缩机的排气温度、压缩机的功耗、系统的COP、系统的火用率以及各个部件火用损失的变化规律。研究结果表明:复叠式制冷系统随着蒸发温度的升高,其最佳低温循环冷凝温度增大,且存在一个最佳的COPopt所对应的最佳低温循环冷凝温度T4 opt;高低温压缩机的排气温度随蒸发温度的升高而降低;系统的COP随蒸发温度的升高而增大;系统的火用效率随蒸发温度的升高而降低先增加后减小;系统的火用损失随蒸发温度的升高而降低。the theoretical and comparative analysis of cascade refrigeration system R744/R404 A and R23/R404 A is carried out in this study. The exhaust temperature,the power consumption of compressor,the COP of the system,the efficiency of the system and the variation rule of each component＇s loss are analyzed. The results show that the optimum cryogenic cooling temperature of the cascade refrigeration system increases with the increase of evaporation temperature,and there is an optimal cryogenic temperature T4 opt corresponding to the COPopt. The exhaust temperature of the high and low temperature compressor decreases with the increase of the evaporation temperature. The COP of the system increases with the evaporation temperature. And the efficiency of the system decreases with the increase of evaporation temperature,then increases and then decreases. The loss of the system decreases with the increase of evaporation temperature.

关 键 词：复叠制冷 性能系数 火用分析 R744 

分 类 号：TB612[一般工业技术—制冷工程]