Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/11020
Title: An experimental study on performance during reverse cycle defrosting of an air source heat pump with a horizontal threecircuit outdoor coil
Authors: Song, M
Xu, X
Deng, S 
Mao, N
Keywords: Air source heat pump
Defrosting
Experiment
Horizontal
Melted frost
Multi-circuit
Issue Date: 2014
Publisher: Elsevier
Source: Energy procedia, 2014, v. 61, p. 92-95 How to cite?
Journal: Energy procedia 
Abstract: When the surface temperature of the outdoor coil in an air source heat pump (ASHP) unit is below both the air dew point and freezing point of water, frost can be formed and accumulated over the surface of the outdoor coil, which is usually of multi-circuit structure in order to minimize its refrigerant pressure loss and enhance the heat transfer between refrigerant and ambient air. However, frosting adversely affects the operational performance and hence the energy efficiency of the ASHP unit, therefore periodic defrosting is necessary. Currently, the most widely standard defrosting method used for ASHP units is reverse cycle defrosting. A previous related study has suggested that during reverse cycle defrosting, downwards flowing of melted frost due to gravity over a vertical multi-circuit outdoor coil in an ASHP unit could deteriorate defrosting performance, by using more energy for defrosting and prolonging a defrosting process. If however an outdoor coil can be horizontally installed, the flow path for melted frost over coil surface can be shortened, and a better defrosting performance expected. In this paper, therefore, an experimental study on performance during reverse cycle defrosting of an ASHP unit having a horizontal three-circuit outdoor coil has been carried out. Firstly, a detailed description of the ASHP unit is presented. This is followed by reporting the experimental results. Finally, a comparative and quantitative analysis is given.
Description: 6th International Conference on Applied Energy, ICAE 2014, Taiwan, 30 May -2 June 2014
URI: http://hdl.handle.net/10397/11020
EISSN: 1876-6102
DOI: 10.1016/j.egypro.2014.11.914
Appears in Collections:Conference Paper

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