An experimental study on defrosting performance of an air source heat pump unit with a multi-circuit outdoor coil at different frosting evenness values
An experimental study on defrosting performance of an air source heat pump unit with a multi-circuit outdoor coil at different frosting evenness values
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DOI：
10.1016/j.applthermaleng.2015.10.082
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发表时间：
2016-02
影响因子：
6.4
通讯作者：
Mengjie Song;Ailu Chen;N. Mao
中科院分区：
文献类型：
--
作者：
Mengjie Song;Ailu Chen;N. Mao
对于垂直安装多回路室外盘管的空气源热泵(ASHP)机组，很少可能使每个回路表面的结霜相等，从而在开始反向循环除霜操作时导致不同的结霜均匀值(FEVS)。另一方面，也发现了不均匀除霜现象，并报道了许多方法来改善ASHP系统的除霜性能，这可能归因于从不均匀结霜开始的反向循环除霜。了解室外多回路线圈空调机组在不同FEVS下的除霜性能对机组的应用具有重要意义，但公开文献中对此方面的研究尚不多见。本文报道了不同FEVS条件下室外盘管表面结霜时除霜性能的实验研究。本文详细介绍了实验装置和实验条件，并给出了实验结果和结论。FEV从82.6%变化到96.6%时，除霜效率提高了6.8%。
For an air source heat pump (ASHP) unit with a vertically installed multi-circuit outdoor coil, it is rarely possible to make the frost accumulations on each circuit's surface equal, leading to different frosting evenness values (FEVs) as a reverse cycle defrosting operation starts. On the other hand, uneven defrosting phenomenon was found and reported as many methods were developed to improve defrosting performance of ASHP systems, which may be attributable to the reverse cycle defrosting starting at an uneven frosting. Understanding of defrosting performance of an ASHP unit with a multi-circuit outdoor coil at different FEVs is of importance for ASHP units' application, but studies are scarce in the open literatures. In this paper, we report an experimental study on defrosting performance when frost accumulated on the surface of outdoor coil at different FEVs. This paper presents details of an experimental ASHP unit and the experimental conditions, followed by results, and conclusions. Finally, an increase of 6.8% in defrosting efficiency was confirmed when the FEV changed from 82.6% to 96.6%.