CO_2跨临界制冷系统单元件改进的性能研究  

Performance analysis of CO_2 transcritical refrigeration system units' improvement

作　　者：李亚强[1] 龚毅[1] 彭锦晨 

机构地区：[1]郑州轻工业学院机电工程学院,河南郑州450002

出　　处：《郑州轻工业学院学报（自然科学版）》2014年第2期80-86,共7页Journal of Zhengzhou University of Light Industry:Natural Science

基　　金：国家"十一五"科技支撑计划项目(2006BAJ01A10-07)

摘　　要：通过加入回热器和旁通阀,对带有双节流阀的CO2跨临界制冷系统进行了改进,通过对改进前后系统性能参数的理论分析和计算,得出结论:一定的工况下存在一个最佳高压侧压力(Ph,opt),它与气冷器出口温度(T3)、蒸发温度(Te)的关系为:Ph,opt=0.264 3 T3-0.008 9 Te-70.255 4;回热器的加入在低于Ph,opt的压力区内对系统性能有较大的提升,旁通阀的加入从理论计算来看对系统性能影响很小.By adding the internal heat exchanger and bypass valve,the transcritical CO2 refrigeration system with dual throttle valve was improved. Through the theoretical analysis and calculation of system performance parameters,it was concluded that： There was an optimum high-pressure Ph,opt,the relationship between the optimum high-pressure（ Ph,opt）,the gas cooler outlet temperature（ T3） and the evaporation temperature（ Te） was： Ph,opt= 0. 264 3 T3-0. 008 9 Te-70. 255 4; there was a larger increase in the region lower than the optimum high-pressure when the internal heat exchanger was used,there was little impact on system performance when the bypass valve was used from a theoretical calculation view.

关 键 词：CO2跨临界制冷系统 高压侧压力 系统性能参数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]