Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN: 9781259696527
Author: J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher: McGraw-Hill Education
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Question

Galvanized steel roofing is becoming more common, and the emissivity of this material is about 0.13 at temperatures around 300K, while its absorptivity for solar irradiation is ??=0.65. Would a bird feel comfortable perched on this roof on a day when Gs=750 W/m2, ?∞=16°C, and h= 7 W/(m2K)? Assume the bottom surface of the roof (the one that would contact the attic) is perfectly insulated and steady state conditions. A temperature of 60°C is generally considered safe to tough without being burned.

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