Performance prediction on a novel solar assisted heat pump with hybrid Fresnel PV plus TEG evaporator

Abstract Aiming to make full use of the heat on PV, a novel solar assisted heat pump with hybrid Fresnel PV plus TEG evaporator (FPV/TEG/SAHP) is proposed and the performance is predicted in this paper. As we all know, most irradiation is transformed to heat as the solar irradiation is absorbed by the PV, resulting in high temperature, while the evaporator of the heat pump could provide a lower temperature. Particularly, TEG could complete the conversion from heat to electrical energy under high temperature difference. In this case, we proposed a novel hybrid system, predicted the performance and discussed the influence of solar irradiation, ambient temperature and condensing water temperature. Results show that by adding TEG between PV and evaporator, the heat on PV can be transformed to electrical energy as a second electrical generation, which can complete a maximum lift of 43.77 W electrical energy and increase the electrical efficiency by 1.40% under 800 W/m2 and the COPPVT of the hybrid system can reach 7.89. Besides, for the FPV/TEG evaporator the thermal efficiency, photovoltaic efficiency and the photovoltaic/thermal efficiency could achieve 142.96%, 28.11% and 216.41% respectively under 300 W/m2 irradiation, which all decrease with the increase of the solar irradiation. Additionally, the exergy efficiency of the hybrid system has optimal irradiation varying with ambient temperature or water temperature.

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