A novel defrosting control method based on the degree of refrigerant superheat for air source heat pumps

Yiqiang Jiang, Jiankai Dong, Minglu Qu, Shiming Deng, Yang Yao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

52 Citations (Scopus)

Abstract

When an air source heat pump (ASHP) unit operates for space heating at a frosting environment, periodic defrosting is necessary to maintain a high system performance. To defrost efficiently, it is necessary to find an effective defrosting control method. In this paper, an experiment was carried out on an ASHP unit with a capillary tube as a throttle device, under simulated frosting and defrosting conditions using time control defrosting method, and the experimental results are firstly presented. Secondly, a novel defrosting control method based on the degree of refrigerant superheat (DS) is reported. To validate the novel defrosting control method, a further experiment was conducted on another ASHP unit with an electronic expansion valve (EEV) as a throttle device, under simulated frosting and defrosting conditions. The experimental results demonstrated that when applying the novel defrosting control method, defrosting was initiated before the operating performances of ASHP unit rapidly deteriorated, which was more reasonable.
Original languageEnglish
Pages (from-to)2278-2288
Number of pages11
JournalInternational Journal of Refrigeration
Volume36
Issue number8
DOIs
Publication statusPublished - 1 Dec 2013

Keywords

  • Air-source
  • Defrosting control method
  • Experiment
  • Heat pump
  • Refrigerant
  • Superheat

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

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