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Item type: Item , Renewable Energy Sources in Heating Systems: Practical Applications and Analysis of Scientific Research(E3S Web of Conferences, 2025-11-13) Xamrayev Sardor Ilhomovich; Qodirov Jobir; Yuldoshev Laziz; Haydarov Rustam; Jamoliddinova Yulduz; Nasimova NasibaThis study analyses the use of solar energy in the heating systems of residential buildings and various sectors of the economy, based on scientific research conducted both in foreign countries and in Uzbekistan. The data show that there is significant potential for efficient utilization of solar energy in the southern regions of the country, considering the available solar resources and climatic conditions. However, there are challenges related to the integration of solar-based heating systems into combined configurations. Studies have focused on the effectiveness of using solar energy through the integration of solar collectors, photovoltaic panels, and heat pumps as well as on reducing energy consumption and optimizing production processes. Special attention is given to methods andItem type: Item , Experimental Study of Apricot Drying Using Direct and Indirect Solar Dryers with Natural Convection(E3S Web of Conferences, 2025-11-13) Qodirov Jobir; Mirzayev Shavkat Mustaqimovich; Yuldoshev Laziz; Barakayev Ikhtiyor; Jumayev Tolibjon; Xamrayev Sardor IlhomovichThis study investigated the drying performance of apricots using direct and indirect solar dryers operating under natural convection. Experimental trials were conducted under field conditions to compare drying time, product surface temperature, moisture reduction, and quality indicators. For reference, openair sun-drying was used as a control. The results showed that apricots dried in the indirect dryer reached equilibrium moisture content in 6 d, compared to 8 d in the direct dryer and 10 d in open-air drying. The product surface temperature in the indirect system was, on average, 12 °C lower than in the direct dryer, thereby preserving the structural integrity of the product. Chemical analysis revealed lower concentrations of toxic elements (0.13 mg/kg vs. 0.22 mg/kg) and nitrate ions (8.5 mg/kg vs. 9.3 mg/kg) in apricots dried in the indirect system compared with open-air drying, resulting in a 10 12% improvement in quality. The findings confirm that indirect solar dryers provide better quality retention and shorter drying times than traditional methods.Item type: Item , Analysis of Scientific Publications on Solar Water Heating Collectors(Sixteen International Conference on Thermal Engineering: Theory and Applications June 18-20, 2025 Bucharest, Romania, 2025-06-18) Shamurotova Sohiba Mustafakulovna; Turapova A.U.; Zubaydullayev U.Z.; Nazarova N.M.This study presents a bibliometric analysis of research on flat-plate solar water heater collectors based on the Scopus database from 2000 to 2025. A total of 937 publications were identified, with the majority being journal articles (65.1%) and conference papers (28.1%). The research predominantly falls under Energy (35.5%) and Engineering (29.1%), highlighting the technological and scientific interest in this field. The international collaboration network indicates that India and the UK (5 studies), as well as Iran and Malaysia (3 studies), have the most active partnerships. India, China, the USA, Iraq, and Saudi Arabia also contribute significantly to global research cooperation. These findings emphasize the growing attention toward solar water heating technologies and the strong collaboration between researchers in leading countries. This study provides insights into publication trends and interdisciplinary contributions, offering a foundation for future research directions in sustainable energy applications.Item type: Item , Research of the Physical Basis of Heat Transfer in Heat Exchanger Devices(Springer Proceedings in Physics, 2025-07-31) Xujakulov Saydulla Mirzayevich; Pardayev Zokir Elmurodovich; Muradov Ismoildjon; Shodiyev TimurThe purpose of this article is to determine the dependence of heat transfer processes on balance and criterion equations, heat transfer in external and internal heat exchange, criterion equations of heat transfer in heat exchange devices, the dependence of heat on physical parameters, and mathematical modeling of the process. The heat transfer coefficient was calculated based on criterion equations related to the Nusselt, Prandtl (from the table), Grasshoff, Pecle and Reynolds numbers. When a pipe with d_0 = 32 mm was studied, according to the calculations based on criteria, it was determined that the heat transfer coefficient is 14.5 x 103 W/m2 K and the heat flux is 29.14 x 103 W when theNusselt number is 730.47. When the heat exchange is calculated when the flow crosses a large number of pipe bundles, the Reynolds number for the flow at a speed of 4 m/s is equal to 12.7 x 104, that is, the flow is turbulent. According to the criterion equations, the Nusselt number reaches 749.7, and the value of the heat transfer coefficient reaches 14,021 W/m2 K. Based on the results of mathematical modeling based on the selected boundary conditions, it was determined that the coefficient of heat transfer is greater, it depends on the flow regime of heat carriers, Reynolds, Nusselt criteria and Prandtl number, and graphs of dependence were obtained.Item type: Item , Physical Principles of Wastewater Heat Utilization Using High-Temperature Solar Installations(Springer Proceedings in Physics, 2025-07-31) Uzakov Gulom Norboyevich; Toshmamatov Bobir Mansurovich; Abduraxmanova Nasiba KuchkarovnaIn world practice, the use of renewable energy sources and heat pump devices in creating modern energy and resource-saving systems for managing traditional fuel and energy resources is increasing. Experimental research, technical measurements, and heat and technical calculation methods were used to assess the efficiency of obtaining technical clean water by utilizing the low-potential heat of wastewater at the “Shurtan Gas-Chemical Complex” enterprice. Analysis of wastewater’s physical and thermal properties from “Shurtan Gas-Chemical Complex” enterprice. Empirical equations were obtained that determine the physical properties of wastewater formed from the addition of oily, chemically contaminated, and domestic wastewater generated in the technological processes of “Shurtan Gas-Chemical Complex” enterprice. As a result, it was determined that the density of wastewater is ρ = 920.2 kg/m3, and the coefficient of dynamic viscosity is μ = 0.00496 m2/ s. A technological scheme was developed that allows obtaining technical water by utilizing the heat of wastewater from “Shurtan Gas-Chemical Complex” enterprice using parabolic cylindrical solar concentrator, and equations were obtained that allow calculating its energy efficiency. For the technological process, 6 Eurotrough-150 solar concentrators are connected in series, with a reflector surface area of 408.75 m2 and a length of 74.25 m. According to the technical parameters of the Eurotrough-150 solar concentrator, experimental studies and calculation results, it was determined that the Eurotrough-150 solar concentrator in the natural climatic conditions of the city of Karshi has an average solar radiation of 700–800 W/m2, ηPCSC = 19.54%, when the Re number of wastewater is 10,000, ηPCSC = 39.08% when Re = 20,000 and ηPCSC = 97% when Re = 50,000