Heat and Mass Transfer: Fundamentals and Applications
5th Edition
ISBN: 9780073398181
Author: Yunus A. Cengel Dr., Afshin J. Ghajar
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 2, Problem 54CP
Consider one-dimensional heat conduction through a large plane wall with no heat generation that is perfectly insulated on one side and is subjected to convection and radiation on the other (the same everywhere). Do you agree with this claim? Why?
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The inside surface of an insulation layer is maintained at 350oC and the outside surface dissipates heat by convection and radiation to air and wall, respectively. The temperatures of air and wall are 15 oC. The insulation layer has a thickness of 10 cm and a thermal conductivity of 15 W/m.K. What is the value of the heat transfer coefficient at the outside surface of the layer, if the temperature at the outside surface should not exceed 225 oC? (The emissivity and the width of the surface are 0.3 and 1 m., respectively. =5.67x10-8 W/m2K4).
Consider heat transfer through a windowless wall of a house on a winter day. Discuss the parameters that affect the rate of heat conduction through the wall.
The inside surface of an insulation layer is maintained at 350oC and the outside surface dissipatesheat by convection and radiation to air and wall, respectively. The temperatures of air and wall are 15 oC.The insulation layer has a thickness of 10 cm and a thermal conductivity of 15 W/m.K. What is the value ofthe heat transfer coefficient at the outside surface of the layer, if the temperature at the outside surfaceshould not exceed 225 oC? (The emissivity and the width of the surface are 0.3 and 1 m., respectively.=5.67x10-8 W/m2K4).
Chapter 2 Solutions
Heat and Mass Transfer: Fundamentals and Applications
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