ON THE ISSUE OF INCREASING THE EFFICIENCY OF FLAT SOLAR COLLECTORS IN HEAT SUPPLY SYSTEMS BY OPTIMIZING THEIR OPERATING PARAMETERS. European Journal of Emerging Technology and Discoveries, [S. l.], v. 1, n. 7, p. 4–7, 2023. Disponível em: https://europeanscience.org/index.php/1/article/view/274. Acesso em: 12 sep. 2025.