热气体空气源热泵多室外机轮流除霜试验研究

IF 3.5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Refrigeration-revue Internationale Du Froid Pub Date : 2025-03-04 DOI:10.1016/j.ijrefrig.2025.03.007

Xiang Li, Guoyuan Ma, Tianyu Lu, Lei Gao, Weilai Rong, Yuexuan Gong, Shuxue Xu

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引用次数: 0

摘要

为提高空气源热泵效率，消除冬季结霜造成的性能下降，搭建了热气旁通除霜实验平台，进行了不同室外温度和不同热气旁通阀开度下的热气旁通除霜实验。结果表明，采用热气旁通除霜方式可以在不中断热泵采暖的情况下很好地完成热泵蒸发器的除霜。在室外温度为-10℃、-5℃和0℃时，热泵启动热气旁通除霜的最适宜时间分别为30 min、40 min和50 min。相应的平均供热容量峰值分别为7.96 kW、10.16 kW和12.08 kW，供热COPC值分别为3.03、3.56和4.19。旁通排气量的增加会缩短除霜时间，但也会降低除霜过程中热泵的供热能力。因此，随着旁通阀开度的不同，系统的最佳融霜启动时间也不同。对于本文构建的系统，20%旁通阀开度除霜效果最佳，最佳除霜启动时间为40 min，此时间段平均热容量和COPC分别达到峰值10.16 kW和3.56 kW。研究结果可为空气源热泵除霜设计提供参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Experimental study on defrosting multi outdoor units in turn for air source heat pump using hot gas

To improve the efficiency of air source heat pumps and eliminate the performance degradation caused by frost in winter, a hot gas bypass defrosting experimental platform was built and the hot gas bypass defrosting experiment under different outdoor temperature and different opening degree of hot gas bypass valve were carried out. The results showed that the defrosting of the heat pump evaporator can be completed well by adopting the hot gas bypass defrosting method without interrupting the heat pump heating. At outdoor temperatures of -10 °C, -5 °C and 0 °C, the most appropriate time for heat pump to activate hot gas bypass defrosting were 30 min, 40 min and 50 min, respectively. The corresponding peak value of average heating capacity were 7.96 kW, 10.16 kW, and 12.08 kW, and the heating COP_C values were 3.03, 3.56, and 4.19, respectively. The increase of bypass exhaust volume would shorten the defrosting time but also reduce the heating capacity of the heat pump during the defrosting process. Hence the optimum defrosting start time of the system is different with different bypass valve opening. For the system built by this paper, the 20 % bypass valve opening had the best performance in defrosting, and the optimal defrosting start time was 40 min, during which the average heating capacity and COP_C achieved peak values of 10.16 kW and 3.56, respectively. These results provide a reference for the defrosting design of air source heat pumps.

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来源期刊

International Journal of Refrigeration-revue Internationale Du Froid 工程技术-工程：机械

CiteScore

7.30

自引率

12.80%

发文量

363

审稿时长

3.7 months

期刊介绍： The International Journal of Refrigeration is published for the International Institute of Refrigeration (IIR) by Elsevier. It is essential reading for all those wishing to keep abreast of research and industrial news in refrigeration, air conditioning and associated fields. This is particularly important in these times of rapid introduction of alternative refrigerants and the emergence of new technology. The journal has published special issues on alternative refrigerants and novel topics in the field of boiling, condensation, heat pumps, food refrigeration, carbon dioxide, ammonia, hydrocarbons, magnetic refrigeration at room temperature, sorptive cooling, phase change materials and slurries, ejector technology, compressors, and solar cooling. As well as original research papers the International Journal of Refrigeration also includes review articles, papers presented at IIR conferences, short reports and letters describing preliminary results and experimental details, and letters to the Editor on recent areas of discussion and controversy. Other features include forthcoming events, conference reports and book reviews. Papers are published in either English or French with the IIR news section in both languages.