PHOTOVOLTAIC THERMAL MODULE WITH CONCENTRATORS OF THE SOLAR RADIATION OF A PARABOLOID TYPE

Abstract

Annotation. The article presents the results of the development and research of a solar photovoltaic thermal module with paraboloid-type solar radiation concentrators. The composition of the solar module includes a composite concentrator, which provides uniform illumination by concentrated solar radiation on the surface of a cylindrical photovoltaic thermal photodetector in the form of an aluminum radiator with photoelectric converters. The developed method for calculating the working profile of the concentrator makes it possible to provide the necessary distribution of illumination in its focal region. A thin heat-conducting dielectric layer is formed on the surface of the radiator using microarc oxidation, on which planar and matrix photoelectric converters are fixed. When exposed to concentrated solar radiation, the electrical efficiency of specially designed matrix photoelectric converters increases, and the heat taken by the heat carrier increases the overall efficiency of the solar module. To visualize the thermal state of the water-cooling radiator of photoelectric converters, a calculation procedure has been developed that is implemented in the Ansys finite element analysis software package and allows visualizing the thermal fields and coolant flows in the radiator. As a result of studies of the concentrator photovoltaic thermal module, an increase in the efficiency of matrix photoelectric converters with the simultaneous receipt of warm water at the outlet was obtained. Uniform illumination of photovoltaic converters with concentrated solar radiation provides an optimal mode of operation. The consumer can use the received electric and thermal energy in an autonomous or parallel power supply with the existing power grid.

Subject of research: the paraboloid type solar radiation concentrator providing uniform illumination by concentrated radiation on the surface of a photovoltaic thermal photodetector with silicon planar and matrix photoelectric converters, the heat removed from which is used by the consumer, thereby increasing the overall module efficiency.

Materials and methods: to create the design documentation for the solar module, the COMPASS 3D computer-aided design system was used; to simulate and visualize the thermal state of a water-cooled radiator with photoelectric converters, the ANSYS finite element analysis system was used; microarc oxidation technology was used to electrically isolate the surface of an aluminum radiator; for the manufacture of a solar module photodetector, encapsulation technology with a two-component polysiloxane compound was used; for field tests of the solar photovoltaic thermal module, a measuring system was used to record the electrical and temperature parameters of the module.

Results: as a result of the calculations and studies, the solar photovoltaic thermal module with paraboloid type solar concentrators with matrix photoelectric converters with uniform illumination on their surface is developed, manufactured and tested, their electrical efficiency increases, and with the help of the removed heat it becomes possible to increase the overall efficiency of the solar module.

Conclusions: methods have been developed that allow calculating the working profile of a paraboloid-type solar radiation concentrator that provides uniform illumination in the focal region, and visualizing using the finite element analysis system the thermal state and flow of the radiator coolant in focus of the concentrator. The electrical efficiency of matrix photoelectric converters increases in the concentrated solar stream due to the uniformity of illumination. The heat carrier, taking heat from the photoelectric converters, cools them, thereby increasing their electrical efficiency, and the heat obtained can be used by the consumer. Thus, not only the electrical efficiency of the module is increased, but also the thermal efficiency, which increases the overall efficiency of the module. The consumer can use the received electric and thermal energy from the solar photovoltaic thermal module in an autonomous or parallel power system.