Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23306
Title: A novel defrosting control method based on the degree of refrigerant superheat for air source heat pumps
Authors: Jiang, Y
Dong, J
Qu, M
Deng, S 
Yao, Y
Keywords: Air-source
Defrosting control method
Experiment
Heat pump
Refrigerant
Superheat
Issue Date: 2013
Publisher: Elsevier
Source: International journal of refrigeration, 2013, v. 36, no. 8, p. 2278-2288 How to cite?
Journal: International journal of refrigeration 
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.
URI: http://hdl.handle.net/10397/23306
ISSN: 0140-7007
EISSN: 1879-2081
DOI: 10.1016/j.ijrefrig.2013.05.016
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