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.
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.
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:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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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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