光伏电池覆盖率和玻璃盖板对光伏太阳能热泵系统综合性能的影响

Influence of cover ratio of PV cells and glass cover on the performance of the PV solar assisted heat pump

光伏太阳能热泵(PV-SAHP)系统具备光电、光热综合利用能力.在该系统中,光伏电池覆盖率的改变,会对系统的光电性能和光热性能产生完全相反的影响:覆盖率减小,系统得热增加,光电输出功率则减小;另一方面,在蒸发器表面加置玻璃盖板,同样会对系统的光电、光热性能产生类似的影响.为此,基于系统的动态分布参数模型,参考热力学第二定律,以系统的炬用效率为判据,研究光伏电池覆盖率和蒸发器玻璃盖板对系统综合性能的影响.结果显示,覆盖率的增大能够明显提高系统的综合性能;而加置玻璃盖板则会导致系统综合性能的下降.

The PV solar assisted heat pump （PV-SAHP） can generate electricity and thermal energy from solar radiation simultaneously. Change in the cover ratio of PV cells leads to an opposite influence on the photovoltaic and thermal performance： the increase of the PV ceils cover ratio is advantageous to the photovoltaic process but adverse to the photothermic process. Additionally, the use of glass cover also leads to a similar influence. To evaluate the performance of PV-SAHP, based on the dynamic distributed parameter model of the system and the second law of thermodynamics, the effects of PV cells＇ cover ratio and glass cover were eontrastively analyzed. The results show that the increase of the PV cells＇ cover ratio is advantageous to the performanee of the system, while the use of glass cover is adverse to the performance of the system.