a solar thermal collector absorbs irradiation and heats water for domestic use. a) to maintain an overall efficiency of 0.3, what is the biggest difference in solar collector temperature to ambient temperature (in degc) that the system can operate in if irradiation is 800 w/m2, overall heat transfer coefficient is 8 w/m2*k, the product of transmissivity and absorptivity is 0.85, and the cell area is 2 m2 ? b) if water enters the solar collector at 25 degc and 1.5 kg/s, what is the temperature of water (in degc) at the exit of the collector?
