A black solar collector, with a surface area of 60 m 2 , is placed on the roof of a house. Incident solar energy reaches the collector with a flux of 800 W/m 2 . The surroundings are considered black...

A black solar collector, with a surface area of 60 m², is placed on the roof of a house. Incident solar energy reaches the collector with a flux of 800 W/m². The surroundings are considered black with an effective temperature of 30C. The convective heat-transfer coefficient between the collector and the surrounding air, at 30C, is 35 W/m²
K. Neglecting any conductive loss from the collector, determine:

a. the net radiant exchange between the collector and its surroundings;

b. the equilibrium temperature of the collector.