Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/43361
Title: An experimental study on the uneven refrigerant distribution over a vertically installed multi-circuit outdoor coil in an air source heat pump unit during reverse cycle defrosting
Authors: Song, M
Wang, Z
Mao, N
Li, Z
Chen, Y
Keywords: Air source heat pump
Experimental study
Multi-circuit outdoor coil
Refrigerant distribution
Issue Date: 2015
Publisher: Pergamon Press
Source: Applied thermal engineering, 2015, v. 91, p. 975-985 How to cite?
Journal: Applied thermal engineering 
Abstract: For an air source heat pump (ASHP) unit with a vertically installed multi-circuit outdoor coil, many parameters would affect system defrosting performance, especially the uneven distribution of refrigerant for each circuit and downwards flowing of melted frost due to gravity from up circuit(s) to down circuit(s). Currently, the negative effects of melted frost have been demonstrated and quantitatively studied, without however giving a fundamental study on the effects of uneven refrigerant distribution due to gravity and tube internal resistance for an ASHP unit with a vertically installed multi-circuit outdoor coil. Therefore, an experimental study on system defrosting performance when refrigerant was evenly or unevenly distributed into each circuit has been carried out and a comparative and quantitative analysis conducted using the experimental data. In this paper, the negative effects of refrigerant uneven distribution on system defrosting performance were demonstrated and an increase of 6.9% in defrosting efficiency when refrigerant evenly distributed, compared with the case of refrigerant unevenly distributed, was reported.
URI: http://hdl.handle.net/10397/43361
ISSN: 1359-4311
EISSN: 1873-5606
DOI: 10.1016/j.applthermaleng.2015.09.006
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