INVESTIGATION OF SURFACE TEMPERATURE OF SOLAR MODULES USING HOLOGRAPHIC OVERHEATING PROTECTION
The article provides an analysis of methods for determining the solar modules surface temperature to monitor its condition, overheating and detecting malfunctions, identifies an infrared image visualization method as the most effective for conducting experimental studies, and shows its advantages compared to other methods considered. Experimental studies to determine the solar modules temperature, the results of which are presented in the article, were carried out in the Republic of Tajikistan, which is characterized by high summer air temperatures and, accordingly, the reliability of the modules is seriously raised. It is shown that modules overheating is accompanied by their rapid degradation and a decrease in power generation. To determine the heating temperature on the solar module front and rear surfaces, the infrared imaging method using an infrared ScanTemp 490 type thermometer was used. To reduce the heating, it was proposed to use a holographic film glued to the entire sensing surface of the module. The parameters taken during the experiment were compared in terms of the two modules efficiency: with a film deposited on the module entire surface and without a film. The study results showed that the module heating temperature when using the film decreases, while the module generated power becomes higher. It was found that the temperature of the module surface heating and power generation depends on the ambient temperature and on air humidity during the day. The actual values of current, voltage and power for two experimental modules were determined. It was established that the change in the values of current and voltage obeys the law of the arrival of solar radiation on the surface of the receiving site, while the current and voltage on the module with the film are higher than on the module with the open surface. The results obtained allow us to conclude that the proposed method for reducing the overheating of modules can have a significant effect when used on a larger number of modules, for example, solar power plants.