Question: =+5-15. A ceiling space is formed by a large flat roof and horizontal ceiling. The inside surface of the roof has a temperature of 145

=+5-15.

A ceiling space is formed by a large flat roof and horizontal ceiling. The inside surface of the roof has a temperature of 145 F (63 C), and the top side of the ceiling insulation has a tem-

perature of 110 F (43 C). Estimate the heat transferred by radiation and convection separately and compare them.

(a) Both surfaces have an emittance of 0.9.

(b) Both surfaces have an emit-

tance of 0.05.

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