Calculation of Thermal and Exergy Efficiency of Solar Power Units with Linear Radiation Concentrators

Section: Introductionmentioning

confidence: 99%

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

Kuchkarov,

Muminov,

Frid

et al. 2024

“…In SAH, due to the use of air as a coolant, research considers the issues of increasing the contact surface between the coolant and heated surfaces in order to increase the heat transfer coefficient [16][17][18][19]. For this purpose, various additional surfaces [20][21][22], such as metal meshes, honeycombs [23][24], are used in place of a flat black surface.…”

Section: Introductionmentioning

confidence: 99%

Optimization of geometrical parameters of the heat receiver of a solar air heating collector

Uzbekov,

Kuchkarov,

Boynazarov

et al. 2024

The article presents the optimization of the radiant surface of the solar air heating collector (SAH). As a radiation-receiving surface of the SAH, a surface is used, which is a system of metal drainage shavings and a V-shaped surface. Based on the study of the heat transfer process, an effective scheme of heat removal from the radiation-receiving surface of the SAH is presented. When optimizing the radiation-sensing surface of the SAH, the process of radiation-sensing of the surface, which depends on the geometric shape of the chips, is taken as the target function of the maximum. A formula is proposed for calculating the determination of the transmitted amount of the radiant flux of the sun to the unit of the frontal surface through the shape of the metal shavings from the value of the opening step angle in different thicknesses of the metal shavings. It has been confirmed that the solar radiant flux passing to the unit of the frontal surface through the metal chip shape reaches its maximum value in the following cases: when the chips are 0,002 m thick, they have an optimal angle φ = 58°, the transmitted energy of the radiant flux through the chip shape is E = 31%; with a chip thickness of 0,0005 m, the optimal angle is φ = 42°, the transmitted energy of the radiant flux through the chip shape is E = 41%; with a thickness of 0,001 m, the optimal angle is φ = 50°, the transmitted energy of the radiant flux through the chip shape is.

“…Although resource-saving devices working on the basis of solar energy developed as a result of these studies are used in the heat supply system with certain positive results, it is necessary to justify the fact that the efficiency of the heat and mass exchange process of the solar air heater collector depends on the structural and mode parameters. not enough research has been conducted [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Determining the optimal placement scheme and height of elements that accelerate heat exchange processes in solar air heater collectors through mathematical modeling

Kuchkarov,

Uzbekov,

Boynazarov

et al. 2024

In the article, the heat exchange accelerating elements used in the collectors of solar air heaters were investigated by thermal and hydraulic mathematical modeling by changing the location scheme and geometric dimensions in homogeneous environment. In this case, the height of the gap between the flat absorber and the transparent glass was 60 mm. The height of elements that accelerate heat exchange processes has increased from 10 mm to 60 mm. The location scheme is laid out in a corridor and a checkerboard pattern. According to the modeling results, the results of the solar air heater collector with the rhombic heat exchange accelerating element were found to be high.