Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/43366
Title: An experimental study on defrosting performance of an air source heat pump unit with a multi-circuit outdoor coil at different frosting evenness values
Authors: Song, M
Chen, A
Mao, N
Keywords: Air source heat pump
Defrosting performance
Experimental study
Frosting evenness value
Multi-circuit outdoor coil
Issue Date: 2016
Publisher: Pergamon Press
Source: Applied thermal engineering, 2016, v. 94, p. 331-340 How to cite?
Journal: Applied thermal engineering 
Abstract: For an air source heat pump (ASHP) unit with a vertically installed multi-circuit outdoor coil, it is rarely possible to make the frost accumulations on each circuit's surface equal, leading to different frosting evenness values (FEVs) as a reverse cycle defrosting operation starts. On the other hand, uneven defrosting phenomenon was found and reported as many methods were developed to improve defrosting performance of ASHP systems, which may be attributable to the reverse cycle defrosting starting at an uneven frosting. Understanding of defrosting performance of an ASHP unit with a multi-circuit outdoor coil at different FEVs is of importance for ASHP units' application, but studies are scarce in the open literatures. In this paper, we report an experimental study on defrosting performance when frost accumulated on the surface of outdoor coil at different FEVs. This paper presents details of an experimental ASHP unit and the experimental conditions, followed by results, and conclusions. Finally, an increase of 6.8% in defrosting efficiency was confirmed when the FEV changed from 82.6% to 96.6%.
URI: http://hdl.handle.net/10397/43366
ISSN: 1359-4311
EISSN: 1873-5606
DOI: 10.1016/j.applthermaleng.2015.10.082
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