A flat roof is insulated on the back and exposed to solar radiation at the front surface as shown diagram. The exposed front surface of the roof area has an absorptivity of 0.8 for solar radiation. If so radiation is incident on the roof front surface at a rate of 750 W/m² and the surrounding air temperat is 21 °C, determine the front surface temperature of the roof when the heat loss by convection a radiation equals the solar energy absorbed by the roof front surface. Assume the combined convect and radiation heat transfer coefficient to be 44 W/m²°C. 750 W/m² 21°C α = 0.8 Front of roof back of roof
A flat roof is insulated on the back and exposed to solar radiation at the front surface as shown diagram. The exposed front surface of the roof area has an absorptivity of 0.8 for solar radiation. If so radiation is incident on the roof front surface at a rate of 750 W/m² and the surrounding air temperat is 21 °C, determine the front surface temperature of the roof when the heat loss by convection a radiation equals the solar energy absorbed by the roof front surface. Assume the combined convect and radiation heat transfer coefficient to be 44 W/m²°C. 750 W/m² 21°C α = 0.8 Front of roof back of roof
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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Transcribed Image Text:A flat roof is insulated on the back and exposed to solar radiation at the front surface as shown
diagram. The exposed front surface of the roof area has an absorptivity of 0.8 for solar radiation. If so
radiation is incident on the roof front surface at a rate of 750 W/m² and the surrounding air temperat
is 21 °C, determine the front surface temperature of the roof when the heat loss by convection a
radiation equals the solar energy absorbed by the roof front surface. Assume the combined convect
and radiation heat transfer coefficient to be 44 W/m²°C.
750 W/m²
21°C
α = 0.8
Front of roof
back of roof
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