Abstract
This research focuses on investigating and improving technical solutions for utilizing evacuated tube heat collectors and solar concentrators to enhance heat transfer efficiency and adapt solar installations to integrate with existing fuel oil heating systems.The research methodology included the development of a mathematical model to describe heat transfer in evacuated tube heat collectors, the creation of an algorithm to calculate the system's design parameters, and numerical modeling to assess temperature characteristics, efficiency, and the impact of key factors affecting the system.As a result of the study, the developed mathematical model made it possible to accurately describe the processes of heat transfer and the interaction of solar radiation with evacuated tube heat collectors and solar radiation concentrators, and to identify analytical dependencies linking the design parameters of the system (pipe diameter and module length) with heat engineering characteristics such as the temperature of the heat carrier and the efficiency of heat transfer.During the study, the relationship between the geometric parameters of the system, solar flux, reflection coefficient, and angular inaccuracy was investigated, which helped identify key factors affecting the efficiency of solar energy capture and the temperature distribution within the system.Numerical calculations have shown that increasing the system's length and adjusting the diameter of the pipes significantly improved the efficiency of solar radiation and affected the coolant's temperature.The paper also analysed the temperature characteristics, including the effect of the coolant flow rate and its distribution along the length of the tube heat collector.The calculation results showed that to optimize the system, it is necessary to consider the interaction of various parameters, including geometry and radiation characteristics, in order to maximise the efficiency of solar power plants.Additionally, the study confirmed the relationship between the receiver diameter and the concentration number, enabling a more accurate prediction of the system's efficiency under various operating conditions.Thus, the results obtained can be used to optimize the design of solar thermal systems, improve their efficiency, and accurately calculate design parameters.