Scientific reports of Bukhara State University


Introduction. The article discusses increasing the intensity of light incident on the surface of a photovoltaic battery (PVB) based on semiconductor solar battery, methods of cooling the PVB and protecting the surface from contamination have been investigated. To do this, the PVB is the planes that reflect light to the long sides, and a polycarbonate collector with a parallel channel on the back, this device looks like a photovoltaic-thermal battery (PVT). The article presents the results of the study of electrical and thermal parameters of PVT when changing (increasing) the intensity of solar radiation using reflective planes and cooling by means of a collector. The effects of cold water temperature, environmental characteristics, and atmospheric dust on PVT efficiency have been studied. Research methods and materials. The experiment compared the power of ordinary PVB, collector PVT, and PVTs with reflective planes and collectors. The temperature of the hot water in the collector PVT and the reflective planes and in the PVT with the collector is compared. Experiments have also been carried out to protect the surface of the PVB from dust. Initial measurements were made using PVBs with the same electrical parameters. PVBs are set horizontally, one of which is closed with a lid during the day. In the next experiment, it was studied that the degree of contamination of PVBs depends on the angle of installation. Two of them are horizontal, and the other three are at angles of 300, 450 and 600, respectively. Results and discussions. According to the measurement results, ordinary PVBs, PVBs with collector reflectors and PVTs with collectors have the highest electric power. The difference between the PVB with the collector and the reflection planes and the hot water outlet from the PVT with the collector was 200C. It was determined that the hot water temperature would not exceed 40°C in the absence of reflective planes. Besides, most of the dust on the surface of the PVB falls at night and the level of contamination of the PVB for the city of Termez has been determined. PVBs installed at different slope angles were tested for PVBs installed below 450 with moderate levels of contamination and high electrical parameters. Conclusion. The PVT was found to produce 1,5-1,6 times more electricity in the southern regions of the country than the traditional PVB. It has been shown that hot water can be obtained at temperatures above 40ºC in winter. Research and experiments conducted in the conditions of Termez have shown that it is possible to get the necessary amount of electricity and hot water throughout the year to create good conditions in a rural home. Besides, at night the surface of the PVBs was closed to prevent contamination.

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