自然工质复叠式制冷循环替代与节能研究  

Study on Replacing and Energy-saving of Natural Refrigerants Cascaded Refrigeration Cycle

作　　者：马一太[1] 宁静红[1] 陈启[1] 马利蓉[1] 

机构地区：[1]天津大学热能研究所,天津300070

出　　处：《节能技术》2005年第4期309-311,共3页Energy Conservation Technology

摘　　要：通过对自然工质R290/CO2和NH3/CO2与常规工质R22/R13的复叠式制冷循环的热力学分析,得出R290/CO2复叠式制冷循环的COP比常规工质R22/R13的低,提出CO2低温循环采用膨胀机代替热力膨胀阀,从而提高了COP。在NH3/CO2复叠式循环的NH3高温循环和CO2低温循环中都采用膨胀机代替热力膨胀阀,可以大大地提高COP。自然工质R290/CO2和NH3/CO2替代常规工质R22/R13复叠式制冷循环有很好的前景。The result that the COP of R290/CO2 is lower than that of R22/R13 is found, by thermodynamic analyzing of natural refrigerants R290/CO2, NH3/CO2 and conventional refrigerants R22/R13 cascaded refrigeration cycle. For enhancing the COP of R290/CO2 cascaded refrigeration cycle, the idea of replacing throttle by expander is proposed. The COP of NH3/CO2 cascaded refrigeration cycle can be enhanced largely by using expander in NH3 high temperature cycle and CO2 low temperature cycle. It can be concluded that R290/CO2 and NH3/CO2 natural refrigerants cascaded refrigeration cycle has a good future.

关 键 词：自然工质 膨胀比 COP 

分 类 号：TB6[一般工业技术—制冷工程]