一种新型太阳能辅助高温热泵系统性能分析

Performance Analysis of a Novel Solar-assisted High Temperature Heat Pump System

为降低压缩机排气温度、优化热泵系统性能,设计了一种利用太阳能集热器加热压缩机排气,利用蒸气显热制取高温热水的新型太阳能辅助热泵系统。结合天津地区的辐射日照条件对新型太阳能辅助热泵系统进行了可行性和热力性能分析,并将其与直膨式太阳能辅助热泵系统的性能进行对比。结果表明:该系统通过提高蒸发温度,可以降低制冷压缩机排气温度,增大太阳能集热量,提高系统性能;在蒸发温度为-10~10℃工况下,该系统制热性能系数较直膨式太阳能辅助热泵系统提高3.8%~5%,综合性能系数(COP)则是后者的1.9~2倍,系统月平均综合COP提高21.2%,年耗功减少7.7%。

In order to reduce the compressor discharge temperature and optimize the heat pump system performance,a novel solar-assisted heat pump system is designed,which uses solar collector to heat the compressor exhaust and uses steam sensible heat to produce high-temperature hot water.Combined with the solar radiation conditions in Tianjin,the feasibility and thermal performance analyses of the novel solar-assisted heat pump system are carried out,its performance is compared with that of the direct expansion solar-assisted heat pump system,and the annual operation performance is analyzed.The analysis results show that by increasing the evaporation temperature,the system can reduce the discharge temperature of the refrigeration compressor,increase the solar heat-collecting capacity and improve the performance of the system.When the evaporation temperature is-10 to 10℃,the heating performance coefficient of the system is 3.8%to 5%higher than that of the direct expansion solar-assisted heat pump system,the comprehensive coefficient of performance(COP)is 1.9 to 2 times of the latter,the monthly average comprehensive COP of the system is increased by 21.2%,and the annual power consumption is reduced by 7.7%.