D.S. Strebkov1, I.V. Mitina1, Y. Charyev2, K. Saryev3
1All-Russian Scientific-Research Institute for Electrification of Agriculture
2Turkmen State Institute of transport and communication
3Turkmen State Power Institute
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Summary. The Purpose of research is to develop optical scheme and calculation of optical and energetic characteristics of solar cogeneration module with prism concentrator and mirror reflectors on the operating and back surfaces to convert solar energy into electrical and thermal energy. Optical scheme of the solar module unlike known modules, contains a mirror reflectors on the operating surface, which are located on a dead zone that arise when returning rays from the mirror reflectors on the back surface are directed to a focusing of prism. Therefore optical losses from the stagnating areas in the considered optical scheme are missing. The analytical expressions for the size of non-performing areas and areas of overlap rays mirror for reflectors on the operating and back surface of focusing prism are presented. The calculation of the rays are conducted for the rays of the solar radiation, perpendicular to the operating surface of the module and for beams, deviating from the normal to the surface at an angle β0. The conditions of total internal reflection of rays in focusing prism, depending on the angle δ tilt mirror reflector to normal plane of operating surface, acute angle φ focusing prism and ψ angle tilt of mirror reflector on the rear surface to surface of focusing prism. From the comparison of three types of focusing prism optical media it is concluded that for cogeneration module one can use distilled water, for PV module is the appropriate use of silicon-organic liquids and polysiloxane gel. When the solar cells efficiency 15%, optical efficiency is 80% the total electrical efficiency of solar module will be 12%, thermal efficiency of 40%, the peak electric capacity 72 W at illumination of 1 kW/m2 and module surface area 0,6 m2, maximum thermal capacity of 240 W. Geometric concentration coefficient k = ctg φ, when φ = 8°, δ =31,5o, ψ = 25° will amount to ctg 8° = 7,15. Real ratio concentration considering optical losses will amount to = 5,72. This means that the area of the absorber and the area of solar cells is reduced in comparison with planar modules and solar collectors without concentrators in 5,72 times. Cogeneration solar module with prism concentrator can be used in stand-alone installations with tracking the Sun and as a module of photovoltaic facade and a solar roof in the buildings.
Keywords: solar energy, prism concentrator, cogeneration PV module.