Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/25493
Title: A study of the reverse cycle defrosting performance on a multi-circuit outdoor coil unit in an air source heat pump - Part I : experiments
Authors: Qu, M
Xia, L
Deng, S 
Jiang, Y
Keywords: Air source heat pump
Defrosting efficiency
Experiment
Multiple parallel refrigerant circuits
Reverse cycle defrost
Issue Date: 2012
Publisher: Pergamon Press
Source: Applied energy, 2012, v. 91, no. 1, p. 122-129 How to cite?
Journal: Applied energy 
Abstract: When an air source heat pump (ASHP) unit operates in heating mode, frost can be accumulated on the surface of its finned outdoor coil which normally has multiple parallel circuits on its refrigerant side for minimized refrigerant pressure loss and enhanced heat transfer efficiency. On its airside, however, there is usually no segmentation corresponding to the number of refrigerant circuit. Frosting deteriorates the operation and energy efficiency of the ASHP unit and periodic defrosting becomes necessary. Currently the most widely used standard defrosting method for ASHPs is reverse cycle defrost. This paper, the first part of a two-part series, reports on the experimental part of a study of the reverse cycle defrosting performance on a multi-circuit outdoor coil unit in an experimental 6.5. kW heating capacity residential ASHP unit. Firstly the experimental ASHP unit is described and experimental procedures detailed. Secondly, the experimental results are reported. This is followed by the discussion on the effects of downwards flowing of the melted frost along a multi-circuit outdoor coil surface on defrosting performance. Finally, the evaluation of the defrosting efficiency for the experimental ASHP unit is provided. In the second part of the series, a modeling analysis on the effects of downwards flowing of the melted frost along the multi-circuit outdoor coil surface on defrosting performance of the experimental ASHP unit will be presented.
URI: http://hdl.handle.net/10397/25493
ISSN: 0306-2619
EISSN: 1872-9118
DOI: 10.1016/j.apenergy.2011.08.034
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

28
Last Week
0
Last month
2
Citations as of Dec 10, 2017

WEB OF SCIENCETM
Citations

25
Last Week
0
Last month
1
Citations as of Dec 10, 2017

Page view(s)

44
Last Week
0
Last month
Checked on Dec 3, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.