电子膨胀阀开度对R32水源热泵系统性能的影响  

Influence of the Degree of Opening of Electronic Expansion Valve on Performance of R32 Water Source Heat Pump System

作　　者：胡鹏荣 陶乐仁[1] 何俊 虞中旸 Hu Pengrong;Tao Leren;He Jun;Yu Zhongyang(Institute of refrigeration and cryogenics, University of Shanghai for Science and Technology, Shanghai, China, 200093)

机构地区：[1]上海理工大学制冷与低温工程研究所,上海200093

出　　处：《制冷学报》2020年第3期111-116,139,共7页Journal of Refrigeration

基　　金：上海市动力工程多相流动与传热重点实验室资助项目(13DZ2260900)。

摘　　要：以R32为制冷剂的变制冷剂流量(VRF,Variable Refrigerant Flow)转子式水源热泵系统为研究对象,通过改变电子膨胀阀开度(从6%到60%),对在不同压缩机频率(从40Hz到60Hz)下热泵系统性能的变化进行了实验分析。结果表明:在压缩机吸气口由过热状态向带液状态转变的过程中,电子膨胀阀开度的调节范围呈先减小后增大的变化趋势;随着电子膨胀阀开度的增加,系统的压比持续下降;在压缩机少量吸气带液(0.98<x<1)时,制热量会出现峰值,制热量较于常规控制过热段提升了6.6%~21.6%,比制冷量的提升多了5%;系统制热性能系数增加了5%~19.5%,比制冷性能系数的增量多了4%;当冷冻水进口温度上升时,系统制热量与性能系数都相应增大,且电子膨胀阀的调节范围也增大。The performance of a variable refrigerant flow type of rotor water source heat pump was experimentally investigated at different compressor frequencies(from 40 to 60 Hz)and openings of the electronic expansion valve(from 6%to 60%).As the suction of the compressor changed from an overheated state to a gas-liquid state,the adjustment range of the opening of the electronic expansion valve decreased first and then increased.As the opening of the expansion valve increased,the compressionratio of the system continuously decreased.Furthermore,when the suctiongas contained a small amount of liquid(0.98<x<1),the heat production peaked with an increase of 6.6%-21.6%in heating capacity and 5%in cooling capacity compared with the conventional control strategy on superheating degree.In addition,the heating coefficient of performance of the system was improved by 5%-19.5%,which was 4%more than the improvement of cooling coefficient of performance.Finally,when the inlet temperature of chilled water increases,the heat production and coefficient of performance increased correspondingly,and the adjustment range of the electronic expansion valve also increased.

关 键 词：水源热泵 压缩机 电子膨胀阀 系统性能 

分 类 号：TB657[一般工业技术—制冷工程] TB715