摘要
首先介绍R404A/CO2复叠式制冷系统和R404A双级压缩式制冷系统,然后通过热力性能计算,对比分析这2种系统在蒸发温度-30^-55℃下的COP和热力完善度等参数,以及冷凝温度对COP的影响,并说明复叠式制冷循环的质量流量比随蒸发温度的变化情况。
The R404A/CO2 cascade refrigeration system and R404 A double-stage compression refrigeration system are introduced firstly.Through calculating thermodynamic performances,the thermodynamic perfectness and COPof these two refrigeration systems are analyzed under evaporating temperature ranging from-30℃to-55℃.Besides,the influence of condensing temperature on COPare also studied.Finally the changes of mass ratio of R404A/CO2 cascade system with evaporating temperature are described.
出处
《制冷与空调》
2015年第5期38-41,共4页
Refrigeration and Air-Conditioning
