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3. Galvanized steel roofing is becoming more common, and the emissivity of this material is about 0.13 at temperatures around 75F, while its absorptivity for
3. Galvanized steel roofing is becoming more common, and the emissivity of this material is about 0.13 at temperatures around 75F, while its absorptivity for solar irradiation is s=0.65. Note in this case that emissivity is not equal to the absorptivity. Would a bird feel comfortable landing on this roof on a day when the incident solar radiation (Gs)800W/m2, the ambient temperature is T=42F, 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 140F is generally considered safe to touch for a few seconds without being burned
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