Combined heat and power generation system based on photovoltaic photo-thermal plate

Abstract

The invention relates to the technical field of solar application and discloses a combined heat and power generation system based on a photovoltaic photo-thermal plate. The combined heat and power generation system comprises the photovoltaic photo-thermal plate and a water tank. The photovoltaic photo-thermal plate comprises an edge frame, a photovoltaic assembly and a micro-channel heat absorption pipe. The water tank is internally provided with a heating coil pipe. Two ends of the heating coil pipe are connected with two ends of a micro-channel heat dissipation pipe through pipelines to form an enclosed loop, and a cooling medium is arranged in the whole loop. A compressor is arranged between liquid inlet ends of the micro-channel heat dissipation pipe and the heating coil pipe, and a throttling device is arranged between liquid outlet ends of the micro-channel heat dissipation pipe and the heating coil pipe. The combined heat and power generation system has the advantages that the stable work temperature of the photovoltaic assembly is maintained, the photovoltaic conversion efficiency is improved, redundant heat of the photovoltaic assembly is recycled to heat water in the water tank, and the solar combined heat and power generation is realized.

Description

technical field [0001] The invention relates to the technical field of solar energy applications, in particular to a combined heat and power generation system based on photovoltaic photothermal panels. Background technique [0002] Solar energy is inexhaustible and can be used for both power generation and heat. However, the current application technology is that photovoltaics and solar heat are separated. The conversion efficiency of photovoltaic power generation is between 8% and 15%, and the remaining 80%~ 90% of the radiant energy is converted into thermal energy of photovoltaic modules and lost to the surrounding environment. Studies have shown that photovoltaic modules have the highest power generation efficiency at 25°C, and when the surface temperature of photovoltaic modules rises by 1°C, the power generation efficiency decreases by 0.3% to 0.5%. It can be seen that reducing the temperature of the photovoltaic module can effectively improve the power generation eff...

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Problems solved by technology

[0003] In order to overcome the problem that the temperature of photovoltaic modules in the prior art is too high, which is not conducive to photothermal conversion, and the excess heat cannot be further utilized, resulting in waste of heat energy, the present invention provides a stable working temperature of photovoltaic modules and improves photoelectric conversion efficiency. At the same time, it can effectively use the cogeneration system of excess heat from photovoltaic modules

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