R134a/CO_2复叠制冷系统的实验研究  

Experimental Research on the R134a /CO_2 Cascade Refrigeration System

作　　者：沈九兵[1] 胡斌[1] 邱建伟[1] 曹锋[1] 邢子文[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《制冷学报》2013年第4期59-63,共5页Journal of Refrigeration

基　　金：广东省教育部产学研结合项目(2011B090400470);江苏省科技厅2011年产学研前瞻项目(BY2011134)资助~~

摘　　要：针对R134a/CO2复叠制冷系统搭建实验台,研究不同工况下系统性能参数的变化规律,考查了压缩机效率对系统性能的影响,并与传统R404A系统性能进行比较。研究表明:在高温级冷凝温度48℃,低温级蒸发温度-30℃,冷凝蒸发器传热温差为3℃的工况下,CO2冷凝温度为-2℃时系统COP出现最大值,并在最优值±5℃内系统性能变化不大;不同实验工况下,CO2压缩机绝热效率最大偏差不超过4%,影响系统制冷量的主要因素是压缩机的容积效率;相同工况下,R134a/CO2复叠制冷系统性能可比常规R404A系统性能高3%。A test rig of the R134a/CO2 cascade supermarket refrigeration system has been buih up to get a comprehensive understanding of its performance. The results show that the maximum COP of the system occurred when the condensing temperature of the CO2 cycle was about - 2℃, the condensing temperature of R134a and the evaporating temperature of CO2 was settled at 48℃ and - 30℃ respectively with a temperature difference of 3℃. Moreover, the COP remained stable while the condensing temperature varied within a certain range of - 5℃. Results also show that the maximum deviation of the compressor adiabatic efficiency is within 4% , the main factor affecting the system cooling capacity is the compressor volumetric efficiency. And the performance of the cascade system could be 3% higher compared with that of conventional R404A refrigeration system at the same condition.

关 键 词：复叠制冷系统 实验研究 R134A CO2 

分 类 号：TB657[一般工业技术—制冷工程]