Performance experiment on solar energy and air dual-heat-source heat pump system

doi:10.11949/0438-1157.20200521

Abstract

Abstract:

The flat micro heat pipe array photovoltaic-thermal module was retrofitted into a photovoltaic-thermal evaporator, and then a novel solar energy and air dual-heat-source heat pump system was developed. The operation performance of the system operating in the solar energy mode (S) as well as the solar energy and air dual-heat-source mode (SA) was studied in detail. Studies have shown that: affected by solar radiation and ambient temperature, the role of ambient air in the dual heat source heating mode will switch between heat release and heat absorption, and the temperature difference between ambient temperature and backplane temperature fluctuates between -3.1—3.5℃; the SA mode was suitable for low solar radiation condition, and its thermal efficiency, comprehensive performance efficiency and COP were 56.7%, 81.7% and 2.38 respectively, which were 20.3%, 25.0% and 6.7% higher than that of the S mode; under the high solar radiation condition, the SA mode would accelerate the heat dissipation of the system, but it could improve the electrical performance of the system. According to the above characteristics, it would get the better operation performance operating in SA mode when the backplane temperature was lower than the ambient temperature as well as operating in S mode when the backplane temperature was higher than the ambient temperature.

Key words: flat micro heat pipe array, solar energy, heat transfer, radiation, heat pump

摘要：

将平板微热管光伏光热组件改造为新型光伏光热蒸发器，研发新型太阳能-空气双热源热泵系统，对太阳能供热模式和双热源供热模式下系统的运行性能进行研究。研究表明：受太阳辐射和环境温度影响，双热源供热模式下环境空气的作用会在放热和吸热之间转换，环境温度与背板温度的温差在-3.1~3.5℃之间波动；双热源供热模式适合在低辐照条件下运行，其热效率、综合性能效率和COP分别达56.7%、81.7%和2.38，比太阳能供热模式提升20.3%、25.0%和6.7%；在高辐射条件下，双热源供热模式会造成系统散热加快，但是对系统发电性能有提升作用。根据上述特性，当背板温度小于环境温度时启动双热源供热模式，反之启动太阳能供热模式，可以进一步提升系统的运行效果。

关键词: 平板微热管阵列, 太阳能, 传热, 辐射, 热泵

CLC Number:

TK 519

HOU Longshu,QUAN Zhenhua,DU Boyao,ZHAO Yaohua,JIANG Bo. Performance experiment on solar energy and air dual-heat-source heat pump system[J]. CIESC Journal, 2020, 71(12): 5498-5505.

侯隆澍,全贞花,杜伯尧,赵耀华,江波. 太阳能-空气双热源热泵系统性能实验[J]. 化工学报, 2020, 71(12): 5498-5505.

Figures/Tables 11

Fig.1 Schematic diagram of flat micro heat pipe array

Fig.2 Schematic diagram of MHPA-PV/TE

Fig.3 Schematic diagram of DHS-HP system

Table 1 Types of related measured instruments and sensors

名称	型号	量程	精度
热电偶	T	-200~350℃	0.5℃
热电阻	Pt100	-40~150℃	0.1℃
压力传感器	MIK6100	0.1~2.5 MPa	0.5%
制冷剂流量传感器	YZCL-4	5~250 L/h	0.5%
水流量传感器	LD-20	0.2~2.0 m3/h	1.0%
电流表	YG1951-AK1R	0~30 A	0.5%
电压表	YG195U-AK1R	0~100 V	0.5%
功率传感器	S350	0~4 kW	1.0%
照度计	TRT-2	0~2000 W/m²	2.0%

Fig.4 Variation curves of solar radiation and ambient temperature

Fig.5 Variation curves of temperature differences in ambient air and back panel as well as ambient air and outlet air

Fig.6 Variation curves of heat gain and thermal efficiency

Fig.7 Variation curves of power generation and electrical efficiency

Fig.8 Variation curves of evaporation and condensation pressures

Fig.9 Variation curves of energy consumption and water tank temperature

Fig.10 Variation curves of overall efficiency and COP

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