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 language | English |
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Pages (from-to) | 2278-2288 |
Number of pages | 11 |
Journal | International Journal of Refrigeration |
Volume | 36 |
Issue number | 8 |
DOIs | |
Publication status | Published - 1 Dec 2013 |
Keywords
- Air-source
- Defrosting control method
- Experiment
- Heat pump
- Refrigerant
- Superheat
ASJC Scopus subject areas
- Building and Construction
- Mechanical Engineering