R22替代工质回热循环的性能分析

R22的替代工质的制冷性能通常比R22差，采用回热循环是改善循环性能的一种方法，但是增加回热器会带来成本的增加，而且不同的制冷剂在回热循环中的COP及容积制冷量的变化也是不同的。针对上述问题，分析回热循环的特性和6种制冷剂（R290，R1270，R134a／R1270（0．45／0．55），R134a／R290（0．6／0．4），R407C和R410A）在回热循环中的容积制冷量和COP的变化特点。研究结果表明，R134a,／R1270，R290和R134a／R290系统使用回热器后，性能改善较大，R410A系统只有在高冷凝温度、高过热度时才有必要使用回热器，其余替代工质系统使用回热器，其系统性能改善不明显。

Performance analysis of substitutes of R22 for the regenerative cycle

The refrigerating performance of substitutes for R22 is usually worse than that of R22,so to adopt regenerative cycle is a method to improve the performance of cycle.But adding a regenerator also increases the cost of the system,besides this,about the change of COP and refrigerating effect per unit volume,the situation of different refrigerants in the heat exchange cycle is uncertain.Based on these problems,analyzes the characters of regenerative cycle and also introduces the change of refrigerating effect per unit volume and coefficient of performance(COP) of six refrigerants for air conditioner(R290,R1270,R134a/R1270(0.45/0.55),R134a/R290(0.6/0.4),R407C and R410A)in this cycle.According to the findings,R134a/R1270,R290 and R134a/R290 used in the heat exchange cycle can improve the performance a lot,it is apt to add a regenerator only on the case of high degree of superheat and condensation temperature when adopting R410A,adding a regenerator when adopting the other refrigerants can't improve the performance obviously.