“…Since then, commercial installations of external receivers have been implemented. Much research has been conducted to improve the external receiver design, which include: optimal dimensions and parameters (Lata, Rodriquez, & de Lara, 2008;Rodríguez-Sánchez M. , Sánchez-González, Marugán-Cruz, & Santana, 2014;Rodríguez-Sánchez M. , Sánchez-González, Acosta-Iborra, & Santana, 2017), analysis and minimization of thermal losses (Rodríguez-Sánchez, Soria-Verdugo, Almendros-Ibáñez, Rodríguez-Sanchez, Marugan-Cruz, Acosta-Iborra, & Santana, 2014;Pye, Zheng, Asselineau, & Coventry, 2014), coating materials (Joly, et al, 2013) and the selection of HTF (Pacio & Wetzel, 2013;Forsberg, Peterson, & Zhao, 2007;Singer, Buck, Pitz-Paal, & Müller-Steinhagen, 2010).…”