Distribution characteristics of refrigerant in microchannel collector/evaporator of direct-expansion solar-assisted heat pump

被引：0
|
作者：
Kong X. [1 ]
Ma T. [1 ]
Ma S. [1 ]
Li Y. [1 ]
Li J. [1 ]
机构：
[1] College of Mechanical and Electronic Engineering, Shandong University of Science and Technology, Qingdao
来源：
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2022年 / 43卷 / 08期
关键词：
Heat pump systems; Infrared imaging; Microchannel collector/evaporator; Propane; Refrigerant distribution; Solar energy;
D O I：
10.19912/j.0254-0096.tynxb.2021-0010
中图分类号：
学科分类号：
摘要：
In order to investigate the refrigerant distribution in a microchannel collector/evaporator and its influence on the performance of a direct-expansion solar-assisted heat pump (DX-SAHP) system, an experimental setup of the DX-SAHP system using propane (R290) was built. Based on the experimental data, a method using infrared imaging technology to analyze the two-phase refrigerant distribution in the microchannel collector/evaporator was proposed. The effects of the electronic expansion valve opening, the solar radiation intensity and the ambient temperature on the two-phase refrigerant distribution in the collector/evaporator were obtained. The results show that when the electronic expansion valve opening increases from 20% to 60%, the refrigerant distribution parameter (RDP) of the microchannel collector/evaporator increases 10.6%, and the system coefficient of performance (COP) has also a marked increase from 2.8 to 5.5. The higher solar radiation intensity or ambient temperature can avoid the occurrence of refrigerant backflow in the microchannel collector/evaporator. © 2022, Solar Energy Periodical Office Co., Ltd. All right reserved.
引用
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页码：236 / 244
页数：8
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