Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/35728
Title: An experimental study on the negative effects of downwards flow of the melted frost over a multi-circuit outdoor coil in an air source heat pump during reverse cycle defrosting
Authors: Song, MJ
Pan, DM
Li, N
Deng, SM 
Keywords: Experiment
Air source heat pump
Defrosting
Melted frost
Issue Date: 2015
Publisher: Pergamon Press
Source: Applied energy, 2015, v. 138, p. 598-604 How to cite?
Journal: Applied energy 
Abstract: When the surface temperature of the outdoor coil in an air source heat pump (ASHP) unit is lower than both freezing point of water and the air dew point, frost can be formed and accumulated over outdoor coil surface. Frosting affects the energy efficiency, and periodic defrosting therefore is necessary. Reverse cycle defrosting is currently the most widely used defrosting method. A previous related study has indicated that during reverse cycle defrosting, downwards flow of the melted frost over a multi-circuit outdoor coil could affect the defrosting performance, without however giving detailed quantitative analysis of the effects. Therefore an experimental study on the effects has been carried out and a quantitative analysis conducted using the experimental data. In this paper, the detailed description of an experimental ASHP unit which was specifically built up is firstly reported. This is followed by presenting experimental results. Result analysis and conclusions are finally given.
URI: http://hdl.handle.net/10397/35728
ISSN: 0306-2619
EISSN: 1872-9118
DOI: 10.1016/j.apenergy.2014.09.010
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