二氧化碳/丙烷用于热泵系统循环性能分析

Cycle performance analysis of heat pump systems using R744/R290 mixture as refrigerants

中文关键词: 非共沸混合工质  热泵热水器  R744/R290  传热窄点

英文关键词: zeotropic mixture  heat pump water heater  R744/R290  heat transfer pinch point

中文摘要:

      在热泵热水器名义工况条件下,对二氧化碳(R744)/丙烷(R290)自然混合工质与四种常见的热泵工质R22、 R134a、R410A和R407C的亚临界循环性能进行了分析对比。结果表明：R744/R290的最优质量配比为21/79,系统的制热循环性能系数(COP_h)比R22系统提高了10.46%,比R134a系统提高了22.67%,比R410A系统提高了11.93%,比R407C系统提高了9.52%；在10%～35%、0～35%、10%～35%和10%～35%的R744质量配比范围内,R744/R290可分别实现对以上四种常见热泵工质的替代；在最优质量配比下, R744/R290系统的冷凝压力低于R410A系统,压比仅为3.271,排气温度为80.9℃。

英文摘要:

      Under the normal conditions of heat pump water heater, the subcritical cycle performances of R744/R290 natural mixture and four kinds of common refrigerants R22、R134a、R410A and R407C used in heat pump were analyzded and compared. Results show that the optimal mass ratio of R744/R290 is 21/79 and the optimal COPh increases by 10.46% compared to R22 system, by 22.67% compared to R134a system, by 11.93% compared to R410A system, by 9.52% compared to R407C system; In the ranges of 10%～35%、0～35%、10%～35%和10%～35% mass fraction of R744, R744/R290 can substitute for four kinds of common refrigerants used in heat pump. Under the optimal mass fraction, the condensation pressure of R744/R290 is lower than that of R410A, the pressure ratio is 3.271 and the discharge temperature is 80.9℃.