The effect of solar radiation on solar panels located in the open and placed in the shade of a building

In this study, the thermal and hydraulic characteristics of the air flow over the metal shavings of the absorber of a solar air heating collector were analyzed. During the study, formulas were derived for calculating the temperature and hydrodynamic parameters of the flow. The air flow temperature, boundary layer thickness, local friction stress on the chip surface and other important parameters were determined. Calculations were performed for various flow rates and Reynolds numbers. The results obtained made it possible to evaluate the influence of metal shavings on the characteristics of the air flow. It was shown that the thickness of the boundary layer decreases with increasing Reynolds number, which is consistent with hydrodynamic theory. A comparison was also made of the thermal resistance for a smooth surface and a surface with metal shavings. The results showed that the use of metal chips could reduce the thermal resistance, which could be beneficial for improving the heat transfer efficiency in solar air heating collectors.

Study of hydrodynamic and thermal parameters of the air flow of a solar air heating collector

Uzbekov,

Boynazarov,

Madaminov

et al. 2024

Energy characteristics of linear focusing concentrator of solar radiation

Kuchkarov,

Umaraliev,

Aliyev

et al. 2024

This article presents a comprehensive analysis of the opticalgeometric parameters of a linear Fresnel solar concentrator, focusing on both theoretical calculations and practical measurements. The research explores the intricate distribution of energy density within the focal plane, a crucial factor in determining the efficiency of solar concentrators. By employing modern computational techniques, we have effectively assessed the optical characteristics and heat generation capabilities of the concentrator, shedding light on its performance metrics. Moreover, the study evaluates the economic viability and environmental impact of the experimental plants, underlining the importance of sustainable energy solutions. As part of our contributions, we developed advanced software that accurately determines the size of the focal spot in the focal plane, facilitating more precise optimization of solar concentrators. The findings highlight the potential of linear Fresnel solar concentrators to enhance solar energy capture and conversion, paving the way for future advancements in the field of renewable energy technology.

Methods to increase heat and energy efficiency using energy saving technologies in buildings

Kuchkarov,

Nomanjonov,

Muzafarova

et al. 2024

In this article, a connection scheme of the heating system was proposed based on the use of solar collectors and heaters as assistants to local boilers used in the heating system of the enterprise on the basis of energy-saving technologies, the construction of the solar heater collector was developed, experimental results were obtained, including the tank accumulator for the selected object, heat in the room loss, calculation of the total amount of heat was determined. These devices can be used to save energy in the heating system of buildings. 21 solar collectors (1.2 kW each) are installed from the Thermotech FP202 solar collector to heat the building, their transmitters consume 0.6 kWh of electricity. The amount of electricity consumed during the heating season (182 days) was calculated to be 2620,8 kWh. The annual energy efficiency of the installed solar collector was determined to be 122304 kWh.