A flat plate solar collector, 6ft by 12ft, is mounted on the roof of a house. The outer surface of the collector is at 110°F and its emissivity is 0.9. The outside air is at 70°F and the sky has an effective temperature for radiation of 45°F. The collector transfers heat by natural convection to the air with a heat transfer coefficient of 3.2 Btu/h.ft^2.°F and also transfers heat by radiation to the sky. Calculate the total heat loss from the solar collector.