eGreanteioranl eoxfptrheesssioyns tfeorm coilnletchtoer aefbfsiceiennccey oafnsdu unsleifguhl et.neFrogry tghaeinr eisc goimvemn aesn [d30e]d: storage volume of 50–100 L/m2 of a collector area, expression for collector efficiency aanndaηvcuesr...