A flat plate solar collector with no cover plate has a selectiveabsorber surface of emissivity 0.1 and solar absorptivity 0.95. Ata given time of day the absorber surface temperature ?? is 120℃when the solar radiation is 750 W/m^2, the effective skytemperature is -10℃, and the ambient temperature ?∞ is 30℃.Assuming that the heat transfer convection coefficient for the calmday conditions, estimated h= 0.22 (?? −?∞) 1 3 W/m^2 K.
(a) Calculate the useful heat removal rate (W/m^2 K) from thecollector for these conditions.
(b) What is the corresponding efficiency of the collector?
