回热器与制冷工质对复叠制冷系统性能的影响  

Effects of regenerator and refrigerant on performance of cascade refrigeration system

作　　者：梁政 申江[1] 韩思雨 LIANG Zheng;SHEN Jiang;HAN Si-yu(Tianjin Key Laboratory of Refrigeration Technology,Tianjin University of Commerce,Tianjin 300134,China)

机构地区：[1]天津商业大学天津市制冷技术重点实验室,天津300134

出　　处：《食品与机械》2020年第10期65-70,86,共7页Food and Machinery

基　　金：天津市研究生科研创新项目(编号:2019YJSS106)。

摘　　要：建立了复叠制冷系统的热力学模型,对比分析了低温级冷凝温度、高温级冷凝温度以及回热器位置对R449A/CO2、NH3/CO2、R404A/CO23种复叠制冷系统性能的影响。结果表明,相同低温级蒸发温度下,NH3/CO2系统的最佳低温级冷凝温度低于R449A/CO2和R404A/CO2系统的,NH3/CO2系统的最佳性能系数COP与R449A/CO2的相差约2%,大幅高于R404A/CO2系统的;复叠系统的CO2低温级设置回热器会使系统性能降低,而高温级设置回热器,R449A/CO2和NH3/CO2系统的性能下降,R404A/CO2系统的性能提高。R449A在复叠制冷系统中性能优良,可作为低GWP冷媒推广使用。In order to optimize the cascade refrigeration system,the thermodynamic models of cascade refrigeration systems were established in this study,and the effects of low and high temperature stage condensation temperature,and regenerator position on the performance of R449A/CO2,NH 3/CO2,R404A/CO2 cascade refrigeration systems were compared and analyzed.The results show that:at the same low temperature stage evaporation temperature,the optimal low temperature stage condensation temperature of the NH 3/CO2 system is lower than that of the R449A/CO2 and R404A/CO2 systems,and the best COP of the NH 3/CO2 system differs from R449A/CO2 by about 2%,which is much higher than that of the R404A/CO2 system.Adding the regenerator to the CO2 low temperature stage of the cascade system will reduce performance of system.However,Adding the regenerator to the high temperature stage will reduce the performance of the R449A/CO2 and NH 3/CO2 systems and increase the performance of the R404A/CO2 system.R449A has excellent performance in cascade refrigeration system and can be used widely as low GWP refrigerant.

关 键 词：复叠制冷系统 热力学模型 性能对比 回热器 

分 类 号：TB657[一般工业技术—制冷工程]