Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/28542
Title: An experimental study on the effects of downwards flowing of melted frost over a vertical multi-circuit outdoor coil in an air source heat pump on defrosting performance during reverse cycle defrosting
Authors: Song, M
Deng, S 
Pan, D
Mao, N
Keywords: Air source heat pump
Defrosting
Experiment
Melted frost
Multi-circuit
Issue Date: 2014
Source: Applied thermal engineering, 2014, v. 67, no. 41671, p. 258-265 How to cite?
Journal: Applied Thermal Engineering 
Abstract: A previous related study has indicated that for an air source heat pump (ASHP) unit having a vertically installed multi-circuit outdoor coil, during reverse cycle defrosting, downwards flowing of melted frost over the outdoor coil surface could affect the defrosting performance, without however giving a detailed quantitative analysis. Therefore an experimental study has been carried out and the study results are reported in this paper. Firstly, a detailed description of a specially built experimental ASHP unit having a vertical multi-circuit outdoor coil is presented. This is followed by reporting the experimental results. Finally, a detailed quantitative analysis is presented. The experimental results and the corresponding analysis demonstrated that allowing downwards flowing of the melted frost over a vertical multi-circuit outdoor coil would result in a longer defrosting duration and more energy consumption. The study results also suggested that the use of water collecting trays can help mitigate these negative impacts on defrosting performance.
URI: http://hdl.handle.net/10397/28542
ISSN: 1359-4311
DOI: 10.1016/j.applthermaleng.2014.03.020
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