Laminar konvektsiya sharoitida tekis quyoshli havo isitgichida issiqlik almashinuvini oʻrganish

Relevance: for the Republic of Uzbekistan, a particularly pressing issue is the reduction of traditional fuel consumption and improvement of the environmental conditions of regions through the use of solar energy in low-temperature thermal energy consumer systems. Such users of thermal energy include numerous drying installations for agricultural products and air heating systems, which often use various types of electric heaters and heaters. In this regard, the simplest and most affordable way to obtain heat for this type of installation can be considered the use of a flat solar air heater, which, without additional costs, can not only heat the premises, but also dry various types of products directly on farms. Therefore, the urgent task is to determine experimentally the possible temperature potential of such a collector in the conditions of the republic and to determine its thermal parameters.

Aim: to determine the degree of air heating during the summer period in the Republic of Uzbekistan in a flat solar air heater, the possible temperature difference arising in the air collector, and to calculate such an important thermal characteristic as the convective heat transfer coefficient in the collector duct.

Methods: during the research, an experimental prototype of a flat-plate air collector was manufactured. Modern temperature sensors and a thermal imager were used in experiments to measure the absorber wall temperature and the air flow at the inlet and outlet of the solar air heater.

Results: the absorber wall temperatures and the air flow at the inlet and outlet of the collector were experimentally obtained in June in the city of Fergana during the days of June 3, 17, 19, 20, 21, 2025 when it moved at low speed (0.28 m/s). Based on the data obtained, heat flow and heat transfer coefficient calculations were performed using well-known thermal engineering formulas.