Efficiency of conversion of energy from solar readiation into internal thermal energy of water in vacuum tube solar heaters. COLOMBIAN JOURNAL OF ADVANCED TECHNOLOGIES, [S. l.], v. 1, n. 37, p. 59–65, 2021. DOI: 10.24054/rcta.v1i37.980. Disponível em: https://ojs.unipamplona.edu.co/index.php/rcta/article/view/980. Acesso em: 15 oct. 2025.