两级分凝自复叠制冷系统特性  

Characteristics of two-stage segregation auto-cascade refrigeration system

作　　者：芮胜军[1,2] 张华[1] 张庆钢[1] 黄理浩[1] 

机构地区：[1]上海理工大学制冷技术研究所,上海200093 [2]河南科技大学车辆与动力工程学院,河南洛阳471023

出　　处：《化工学报》2013年第6期2029-2035,共7页CIESC Journal

基　　金：国家自然科学基金项目(51176124);上海市优秀学科带头人项目(10XD1403100);上海市重点学科建设项目(S30503)~~

摘　　要：以两级分凝自复叠制冷系统为研究对象,分析了三元混合工质空间和平面汽液平衡特性,对三元混合工质的组分变化规律及运行特性进行了理论研究。应用混合工质物性分析软件Refprop 8.0根据冷凝蒸发器冷量平衡特性讨论了混合工质组分比例,得到比较合理的配比组成65/20/15。通过5个平面压焓图的空间变化关系分析了自复叠制冷系统工质分离、混合和运行特性。根据实验研究,循环系统高低压旁通和相分离器出口气体旁通可有效改善压缩机启动初期系统压力和温度过高的问题。对系统各级节流降温过程进行了分析,并对压缩机的吸排气温度和蒸发温度进行了研究。A two-stage segregation auto-cascade refrigeration system was studied. The vapor-liquid equilibrium characteristics of a ternary mixed-refrigerant, composition change rules and operating characteristics of the ternary system were investigated. Refprop 8.0, general software for mixed-refrigerant property analysis with abroad applications, was used. The composition proportion of mixed-refrigerant was discussed according to the cooling capacity balance characteristics of evaporative condense and a reasonable proportion was obtained. The separation, mixing and operating characteristics of auto-cascade refrigeration system mixed-refrigerant were analyzed on the basis of spatial changes of five plane pressure-enthalpy diagrams. According to the experimental research, high-low pressure bypass and phase separator outlet vapor bypass of circulatory system could effectively improve the high discharge pressure and discharge temperature in the starting process. The throttle cooling process of each stage was analyzed, and the suction and discharge temperatures and evaporative temperature of compressor were studied.

关 键 词：自复叠制冷 混合工质 分凝循环 单级压缩 

分 类 号：TB657.3[一般工业技术—制冷工程]