摘要
为了探究双级压缩制冷系统和复叠式制冷系统在低温环境下运行的可行性和经济性,在冷凝温度30℃,蒸发温度-20℃^-50℃工况下,通过EES模拟,将四种双级压缩循环方式分别与复叠式循环方式进行对比分析。研究表明:在蒸发温度从-20℃降到-50℃的工况下,同蒸发温度下,复叠循环系统的COP比一次节流中间完全(不完全)冷却循环系统的COP高20%,对于一次节流中间完全(不完全)冷却循环与复叠循环,系统COP都降低50%;对于二次节流中间完全(不完全)冷却循环与复叠循环,在同蒸发温度下,复叠循环系统的COP与二次节流中间完全冷却循环系统的COP相差不大,复叠循环系统的COP低于二次节流中间不完全冷却循环系统的COP,但二次节流的两个节流阀口径大,难协调并且系统回油不均,无法长期稳定运行。因此,在低温工况下(-20℃^-50℃)复叠循环相比于双级压缩循环具有更高的节能性、可行性。
In order to explore the feasibility and economy of the two -stage compression refrigeration system and cascade re- frigeration system running in low temperature environment, with the condensation temperature of 30 ℃ and the evaporation tem- perature of - 20℃ to - 50℃, we compared and analyzed four kinds of two - stage compression cycles and cascade refrigeration system by EES simulation method. The study shows that ： when the evaporation temperature reduced from - 20℃ to - 50℃, at the same evaporation temperature, the COP of the cascade refrigeration system is 20% higher than the COP of the primary thrott- ling central complete （incomplete） compression refrigeration system, but the COP is both reduces by 50% to the cascade refrige- ration system and primary throttling central complete （incomplete） compression refrigeration system ; at the same evaporation tem- perature, the COP of the cascade refrigeration system is slightly less than the secondary throttling central complete （incomplete） compression refrigeration system, but in the secondary throttling central complete （incomplete） compression refrigeration system, the diameter of the two throttle valves is large, so it is difficult to coordinate and the system can not return to the oil well, so it cant run steadily for a long time. Therefore, at low temperature （ -20℃ to -50℃ ）, compared to the two -stage compression cycle, the cascade cycle has higher energy saving and feasibility.
作者
赵瑞昌
杨永安
刘园
郑标帝
Zhao Ruichang;Yang Yong＇an;Liu Yuan;Zheng Biaodi(Tianjin Key Laboratory of Refrigeration Technology, Refrigeration Engineering Research Center of Ministry of Education of People＇s Republic of China, Tianjin Refrigeration Engineering Technology Center, Tianjin University of Commerce, Tianjin 300134, China)
出处
《低温与超导》
CAS
北大核心
2018年第7期92-96,共5页
Cryogenics and Superconductivity
关键词
复叠循环
双级压缩循环
蒸发温度
COP
Cascade cycle
Two- stage compression cycle
Evaporation temperature
COP
