Experimental Study on Air-Source Heat Pump Alternate Defrosting with Multiple Outdoor Units in Parallel

Niu Jianhui; Liang Zheng; Liu Fusheng; Ma Guoyuan; Feng Lianyuan

doi:10.12465/j.issn.0253-4339.2024.06.158

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Experimental Study on Air-Source Heat Pump Alternate Defrosting with Multiple Outdoor Units in Parallel

更新时间：2024-12-13

- Experimental Study on Air-Source Heat Pump Alternate Defrosting with Multiple Outdoor Units in Parallel
- Journal of Refrigeration Vol. 45, Issue 6, Pages: 158-166(2024)
- 作者机构：
  
  1.河北建筑工程学院河北省可再生能源供热工程技术中心　张家口　 075000
  2.北京工业大学环境与生命学部　北京　 100124
  3.河北水利电力学院河北省数据中心相变热管理技术创新中心　沧州　 061001
- 作者简介：
  
  Ma Guoyuan, male, Ph. D., professor, Ph. D. supervisor, Department of Environment and Life, Beijing University of Technology, 86-13911020383, E-mail: magy@bjut.edu.cn. Research fields: new technology for environmental protection and energy saving in refrigeration and air-conditioning systems.
- 基金信息：
  
  Science and Technology Project of Hebei Education Department(ZD2022116);Hebei Provincial Graduate Student Innovation Ability Training Project(CXZZSS2023161);the Open Project Program of the Hebei Technology Innovation Center of Phase Change Thermal Management of Data Center(SKF-2022-08)
- DOI：10.12465/j.issn.0253-4339.2024.06.158
  CLC： TB61⁺2;TB657.5
- Published：16 December 2024，
  
  Received：17 July 2023，
  
  Revised：26 October 2023，
  
  Accepted：2023-11-14
- 稿件说明：
移动端阅览
NIU JIANHUI, LIANG ZHENG, LIU FUSHENG, et al. Experimental Study on Air-Source Heat Pump Alternate Defrosting with Multiple Outdoor Units in Parallel. [J]. Journal of refrigeration, 2024, 45(6): 158-166.
DOI：

NIU JIANHUI, LIANG ZHENG, LIU FUSHENG, et al. Experimental Study on Air-Source Heat Pump Alternate Defrosting with Multiple Outdoor Units in Parallel. [J]. Journal of refrigeration, 2024, 45(6): 158-166. DOI： 10.12465/j.issn.0253-4339.2024.06.158.

摘要

设计并搭建了多台室外机并联空气源热泵实验系统，采用热液过冷对室外机进行轮换除霜。实验研究在不同室外温、湿度条件下系统制热性能随结、除霜的变化特点，并与热气旁通轮换除霜对比。结果表明：热液过冷轮换除霜效果良好，当室外侧空气温度为-10 ℃、相对湿度为90%时，最佳开始除霜时间为30 min，系统制热量由无霜时的9.87 kW降至开始除霜时的8.71 kW，制热COP由无霜时的3.73降至开始除霜时的3.36。不同湿度工况下运行除霜时，系统制热量及制热COP最小值可达5.42 kW、2.28。与旁通20%热气除霜相比，热液过冷轮换除霜平均制热量提升13.8%、制热COP

提升10.1%。

Abstract

An experimental system of an air-source heat pump with multiple outdoor units in parallel was designed and built. The outdoor units were defrosted in turn using hot subcooled liquid for defrosting. The heat pump heating performance variations in the course of frostin

g and defrosting under different outdoor temperature and humidity conditions were experimentally studied

and the heating performances of the hot liquid subcooling alternate defrosting system and hot gas bypass alternate defrosting system were compared and analyzed. The experimental results show that the hot liquid subcooling alternate defrosting can enable the heat pump to complete the defrosting under the condition of continuous heating and that the defrosting performance is good. When the outdoor air temperature is -10 ℃ and the relative humidity is 90%

the optimal time to start defrosting is 30 min. At this time

the system heating capacity decreases from 9.87 kW when there is no frost to 8.71 kW when the defrosting starts

and the heating COP decreases from 3.73 to 3.36. When the system operates defrosting under different humidity conditions

the minimum values of system heating capacity and heating COP can reach 5.42 kW and 2.28

respectively. Compared to the case of bypassing 20% of discharge gas for defrosting

the average heating capacity of hot liquid subcooling alternate defrosting is 13.8% higher

and the heating COP

is 10.1% higher.

关键词

空气源热泵热液除霜热气除霜制热性能

Keywords

air-source heat pumphot liquid defrostinghot gas defrostingheating performance

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Related Institution

河北省数据中心相变热管理技术创新中心

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Department of Energy Engineering, Hebei University of Architecture

College of Electrical, Energy and Power Engineering, Yangzhou University

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