The emissivity of galvanized steel sheet, a common roofing

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QUESTION:

The emissivity of galvanized steel sheet, a common roofing material, is 0.13 at temperatures around 300 K, while its absorptivity for solar irradiation is S 0.65. Would the neighborhood cat be comfortable walking on a roof constructed of the material on a day when GS 750 W/m2 , T 16 C, and h 7 W/m2 K? Assume the bottom surface of the steel is insulated.

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QUESTION:

The emissivity of galvanized steel sheet, a common roofing material, is 0.13 at temperatures around 300 K, while its absorptivity for solar irradiation is S 0.65. Would the neighborhood cat be comfortable walking on a roof constructed of the material on a day when GS 750 W/m2 , T 16 C, and h 7 W/m2 K? Assume the bottom surface of the steel is insulated.

ANSWER:


Yes, the neighborhood cat would be comfortable walking on the roof constructed of galvanized steel sheet. Since the emissivity of the steel sheet is 0.13, it would be able to radiate away 13% of the solar radiation absorbe

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