Enhancing the solar-to-thermal energy conversion in high vacuum flat plate solar collectors Roberto Russo, Davide De Maio, Carmine D’Alessandro, Daniela De Luca, Antonio Caldarelli, Eliana Gaudino, Marilena Musto and Emiliano Di Gennaro EPJ Web Conf., 266 (2022) 07005 Published online: 13 October 2022 DOI: 10.1051/epjconf/202226607005