Solar photovoltaic photothermal combined technology organically combines a single photovoltaic module and a solar collector. The photovoltaic module serves as a photoelectric conversion device and a heat absorber of the collector. It also converts solar energy into heat energy and electrical energy, thereby realizing cogeneration of heat and power to improve the comprehensive utilization rate of solar energy. Compared with traditional independent photovoltaic systems and heat collection systems, photovoltaic/photothermal collectors (abbreviated as PV/T collectors) have the advantages of 1. improving the comprehensive utilization of solar energy;2. It can share some components, thereby reducing the cost of the system;3. Reducing the required installation area, which is conducive to the aesthetics of the building.

This project innovatively adds a circulating cooling system between the photovoltaic module and the evaporator, so that the heat pump evaporator is not directly coupled to the photovoltaic module, but indirectly connects the two through the circulating cooling system. The circulating cooling system continuously collects the heat from the photovoltaic modules through cooling media such as air, water or heat transfer oil, and then exchanges heat with the heat pump evaporator. This can improve the photoelectric conversion efficiency of the battery panel; secondly, it can enable the heat pump to obtain a higher evaporation temperature, thereby improving the performance of the heat pump, and also overcomes the frequent frosting or freezing of the heat pump evaporator at low temperatures of the air source heat pump; Third, the system is relatively flexible and adaptable. It can overcome the problems such as difficulty in matching the direct-expansion photovoltaic heat pump system and large pressure loss of the heat pump working medium in the PV/T evaporator.