A black solar collector, with a surface area of 60 m 2 , is placed on the roof of a house. Incident.

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/m2K. Neglecting any
conductive loss from the collector, determine:

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

b.
»

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/m2K. 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.

»

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