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
收藏
页码：236 / 244
页数：8
相关论文
共 32 条
  • [1] BWLLOS E, TZIVANIDIS C., Energetic and financial sustainability of solar assisted heat pump heating systems in Europe, Sustainable cities and society, 33, pp. 70-84, (2017)
  • [2] BUKER M S, RIFFAT S B., Solar assisted heat pump systems for low temperature water heating applications: a systematic review, Renewable & sustainable energy reviews, 55, pp. 399-413, (2016)
  • [3] CHEN J F, DAI Y J, WANG R Z., Experimental and theoretical study on a solar assisted CO<sub>2</sub> heat pump for space heating, Renewable energy, 89, pp. 295-304, (2016)
  • [4] MA K R, LI X F, LI S Q, Et al., Contrastive research of heating performance of direct expansion solar/air assisted heat pump system and air-source heat pump, CIECS journal, 71, pp. 375-381, (2020)
  • [5] GHOUBALI R, BYRNE P, BAZANTAY F., Refrigerant charge optimisation for propane heat pump water heaters, International journal of refrigeration, 76, pp. 230-244, (2017)
  • [6] HARBY K., Hydrocarbons and their mixtures as alternative to environmental unfriendly halogenated refrigerants: an updated overview, Renewable & sustainable energy reviews, 73, pp. 1247-1264, (2017)
  • [7] KIM M H, BULLARD C W., Performance evaluation of a window room air conditioner with microchannel condenser, Journal of energy resources technology, 124, pp. 47-66, (2002)
  • [8] PARK C Y, HRNJAK P., Experimental and numerical study on micro channel and round-tube condensers in a R410A residential air-conditioning system, International journal of refrigeration, 31, pp. 822-831, (2008)
  • [9] KULKARNI T, BULLARD C W, CHO K., Header design tradeoffs in microchannel evaporators, Applied thermal engineering, 24, pp. 759-776, (2004)
  • [10] VIST S, PETTERSEN J., Two-phase flow distribution in compact heat exchanger manifolds, Experimental thermal and fluid science, 28, pp. 209-215, (2004)
1234