摘要
混合工质的不同直接影响到自复叠制冷机组的各项性能。在给定的工况下分析了R744/R600 a、R744/R290、R744/R134 a、R23/R134 a、R23/R22与R32/R600等混合工质的配比、蒸发器出口温度对机组的冷凝压力、制冷量、压缩机耗功和COP的影响。结果表明:R744/R600 a、R744/R290、R744/R134 a与R32/R600 a的最佳配比为35∶65,R23/R134 a的最佳配比为40∶60,R23/R22的最佳配比为30∶70,其中R744/R290系统的COP值为最大;低沸点组分增大情况下,R744/R290、R744/R134 a与R23/R22机组的制冷量和压缩机耗功随着先增加后减小,但R23/R134 a、R32/R600与R744/R600 a机组的制冷量和压缩机耗功一直增加;在最佳配比情况下,随着蒸发温度的升高,其机组的COP值不断增加,而冷凝压力几乎不变。
The different mixed refrigerants directly impact on the performances of the auto - cascade refrigeration unit. This article focused on the impact of both the mixed rate of refrigerant such as R744/R600a.R744/R290,R744/Rt34a.R23/R134a. R23/R22 .R32/R600 and outlet temperature of the evaporator to the condensed pressure, the refrigeration capacity, compressor consumption and COP. It was concluded that the supreme mixed ratio of R744/R600a.R744/R290.R744/R134a.R32/R600a is 65： 35, R23/R134a is 60：40 and R23/R22 is 70： 30. The system COP of R744/R290 is highest among them. With the increasement of the lower boiling point component, the refrigeration capacity and the compressor consumption of the R744/R290. R744/R134a.R23/R22 units go up first and then down later, however, those of R23/R134a .R32/R600 .R744/R600a increase all the time ; with the rise of the evaporation temperature in the ease of the the supreme mixed ratio, the COP of the units continues to go up, whereas the condensed pressure is nearly constant.
出处
《低温与超导》
CAS
CSCD
北大核心
2008年第10期14-18,38,共6页
Cryogenics and Superconductivity
关键词
自复叠制冷系统
混合工质
配比
Auto - cascade refrigeration system, Mixed refrigerant, Mixture ratio
