An experimental study on the negative effects of downwards flow of the melted frost over a multi-circuit outdoor coil in an air source heat pump during reverse cycle defrosting
An experimental study on the negative effects of downwards flow of the melted frost over a multi-circuit outdoor coil in an air source heat pump during reverse cycle defrosting
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DOI：
10.1016/j.apenergy.2014.09.010
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发表时间：
2015-01
期刊：
影响因子：
11.2
通讯作者：
Mengjie Song;D. Pan;Ning Li;S. Deng
中科院分区：
文献类型：
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作者：
Mengjie Song;D. Pan;Ning Li;S. Deng
当空气源热泵机组室外盘管表面温度低于水的冰点和空气露点时，室外盘管表面会结霜并积聚。结霜影响能源效率，因此定期除霜是必要的。逆循环除霜是目前应用最广泛的除霜方法。以前的相关研究表明，在反向循环除霜过程中，融化霜在室外多回路盘管上的下行流动会影响除霜性能，但没有对影响进行详细的定量分析。为此，本文对其影响进行了实验研究，并利用实验数据进行了定量分析。本文首先详细介绍了一台专门搭建的实验装置。然后给出了实验结果。最后给出了结果分析和结论。
When the surface temperature of the outdoor coil in an air source heat pump (ASHP) unit is lower than both freezing point of water and the air dew point, frost can be formed and accumulated over outdoor coil surface. Frosting affects the energy efficiency, and periodic defrosting therefore is necessary. Reverse cycle defrosting is currently the most widely used defrosting method. A previous related study has indicated that during reverse cycle defrosting, downwards flow of the melted frost over a multi-circuit outdoor coil could affect the defrosting performance, without however giving detailed quantitative analysis of the effects. Therefore an experimental study on the effects has been carried out and a quantitative analysis conducted using the experimental data. In this paper, the detailed description of an experimental ASHP unit which was specifically built up is firstly reported. This is followed by presenting experimental results. Result analysis and conclusions are finally given.