“…where C is the solar concentration ratio, I is the incident solar flux density [W/m 2 ], is the Stefan-Boltzmann constant, T and T0 are the receiver and ambient temperature [K], respectively. The following parameters were considered for the calculation: C = 100 and 1000 [27], I = 1000 W/m 2 , T = 600 ºC (873K), 700 ºC (973K) and 800 ºC (1073K), T0 = 298 K.…”