Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/11347
Title: A study of the reverse cycle defrosting performance on a multi-circuit outdoor coil unit in an air source heat pump - Part II : modeling analysis
Authors: Qu, M
Pan, D
Xia, L
Deng, S 
Jiang, Y
Keywords: Air source heat pump
Defrosting performance
Modeling
Multiple parallel refrigerant circuits
Reverse cycle defrost
Issue Date: 2012
Publisher: Pergamon Press
Source: Applied energy, 2012, v. 91, no. 1, p. 274-280 How to cite?
Journal: Applied energy 
Abstract: The experimental part of the study of the reverse cycle defrosting performance on a four-circuit outdoor coil unit in an experimental 6.5. kW heating capacity residential ASHP has been reported in Part I of a two-part series. The experimental results indicated that downwards flowing of the melted frost along a multi-circuit outdoor coil surface would have negative effects on defrosting performance. In order to quantitatively analyze the effects, this paper, the second part of the two-part series, reports on a modeling analysis where a semi-empirical model of the airside defrosting in the four-circuit outdoor coil unit was developed. The model was validated by comparing the predicted defrosting duration and temperature variation of collected melted frost with the corresponding experimental data presented in Part I of the two-part series. Using the validated model, the frost-melting rate and the temperature of melted frost on the surface of each circuit were predicted. The effects of the downwards flowing melted frost along the entire outdoor coil surface on defrosting performance were quantitatively analyzed.
URI: http://hdl.handle.net/10397/11347
ISSN: 0306-2619
EISSN: 1872-9118
DOI: 10.1016/j.apenergy.2011.08.036
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