EXPERIMENTAL STUDY ON R290 DIRECT-EXPANSION SOLAR-ASSISTED HEAT PUMP HEATING SYSTEM

Kong Xiangqiang; Zhang Peng; Xu Xian; Yan Xunzheng; Yue Zhenwei

doi:10.19912/j.0254-0096.tynxb.2022-0139

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (6) : 323-329. DOI: 10.19912/j.0254-0096.tynxb.2022-0139

EXPERIMENTAL STUDY ON R290 DIRECT-EXPANSION SOLAR-ASSISTED HEAT PUMP HEATING SYSTEM

Kong Xiangqiang, Zhang Peng, Xu Xian, Yan Xunzheng, Yue Zhenwei

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Abstract

In order to analyze the actual operation characteristics of direct-expansion solar-assisted heat pump for radiant floor heating system in Northern Cold Region, a direct-expansion solar-assisted heat pump system using propane （R290） as refrigerant is designed and built, in which the effect of environmental parameters on the thermal performance of the system under different operating conditions in winter is analyzed. The experimental results show that the system can realize the stability of indoor heating. During the experiments, the average room temperature is kept between 16.1 and 20.8 ℃, the coefficient of performance （COP） of the heat pump is kept between 2.57 and 4.3, and the COP of the heating system is kept between 2.24 and 3.98. Furthermore, when the solar irradiation intensity increases by 50 W/m², the COP of the heat pump increases by 7.1%. When the ambient temperature increases by 1 ℃, the COP of the heat pump increases by 6.7%. In addition, the solar radiation intensity has significant influence on the opening of electronic expansion valve and refrigerant mass flow rate of the heat pump system. When the final water temperature in the hot water storage tank increases from 45 to 55 ℃, the COP of the heat pump decreases by 12.2%, while the COP of the heating system reaches the maximum of 3.37 at the final water temperature of 50 ℃.

Key words

solar energy / heat pump system / propane / coefficient of performance / radiant floor heating / experiment

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Kong Xiangqiang, Zhang Peng, Xu Xian, Yan Xunzheng, Yue Zhenwei. EXPERIMENTAL STUDY ON R290 DIRECT-EXPANSION SOLAR-ASSISTED HEAT PUMP HEATING SYSTEM[J]. Acta Energiae Solaris Sinica. 2023, 44(6): 323-329 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0139

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