Experimental performance analysis and evaluation of a novel frost-free air source heat pump system
Experimental performance analysis and evaluation of a novel frost-free air source heat pump system
复制标题
新型无霜空气源热泵系统实验性能分析与评价
DOI：
10.1016/j.enbuild.2018.07.031
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发表时间：
2018-09
影响因子：
6.7
通讯作者：
Wenke Fan
中科院分区：
文献类型：
--
作者：
Zhihua Wang;Fenghao Wang;Zhenjun Ma;Mengjie Song;Wenke Fan
针对空气源热泵冬季运行时室外盘管表面结霜的问题，研制了一种新型无霜空气源热泵系统。然而，系统的除湿性能和除霜时间在很大程度上取决于第一级节气门的电子膨胀阀(EEV)的开度。此外，系统的性能系数(COP)由第二级节气门的EEV开度控制。因此，本研究的目的是从除湿效率、回热效率、压缩比、供热能力和COP等方面研究EEV开度对系统热力性能的影响。试验结果表明，当第一级节流阀开度为75%，第二级节流阀开度为40%时，发动机性能最佳。此外，为了优化系统性能，建立了COP与一级节流和二级节流的EEV开度之间的关系式。结果表明，系统的热力学特性对第一级节流和第二级节流的EEV开度变化高度敏感。
To tackle the problem of frosting occurred on the outdoor coil surface when an air source heat pump (ASHP) is operated in winter, a novel frost-free ASHP system has been developed. However, the dehumidification performance and the frost-free time of the system operated are highly dependent on the electronic expansion valve (EEV) opening of the 1st stage throttle. In addition, the coefficient of performance (COP) of the systems is controlled by the EEV opening of the 2nd stage throttle. Therefore, the objective of this study is to investigate the effect of the EEV opening on the system thermodynamic performance in terms of dehumidification efficiency, regeneration efficiency, compression ratio, heating capacity and COP. It was observed that the optimal performance was achieved when the EEV openings of the 1st stage throttle and 2nd stage throttle were 75% and 40% respectively. In addition, a correlation of COP with the EEV openings of the 1st stage throttle and 2nd stage throttle was developed to optimize the system performance. The results showed that the system thermodynamic characteristics were highly sensitive to the variation in the EEV openings of both the1st stage throttle and 2nd stage throttle.
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