7th Edition

ISBN: 9780470501979

Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine

Publisher: Wiley, John & Sons, Incorporated

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Radiation can be described as the energy in the form of a particular matter or electromagnetic waves traveling in the air and can be in the form of light, sound, and heat. Radiation can be detected through special instruments like X-rays. The radiation f…

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Textbook Question

Chapter 12, Problem 12.111P

Solar flux of 900 W / m 2 is incident on the top side of a plate whose surface has a solar absorptivity of 0.9 and an emissivity of 0.1. The air and surroundings are at 17 ∘ C and the convection heat transfer coefficient between the plate and air is 20 W / m 2 ⋅ K . Assuming that the bottom side of the plate is insulated, determine the steady-state temperature of the plate.

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Chapter 12, Problem 12.110P

Chapter 12, Problem 12.112P

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Consider a large plane wall of thickness L = 0.8 ft and thermal conductivity k = 1.2 Btu/h-ft-°F. The wall is covered with a material that has an emissivity of ε = 0.80 and a solar absorptivity of a = 0.60. The Inner surface of the wall is maintained at T₁ = 524 R at all times, while the outer surface is exposed to solar radiation that is incident at a rate of q solar = 300 Btu/h-ft2. The outer surface is also losing heat by radiation to deep space at O K. 0 Plate a solar o = 0.1714 x 10-8 Btu/h ft2 R4 Sun If the temperature of the outer surface of the wall is 556.39 R, determine the rate of heat transfer through the wall when steady operating conditions are reached. (Round your answer up to 2 decimal places.) 51 Btu/h-ft2 (per The rate of heat transfer through the wall when steady operating conditions are reached unit area)

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Chapter 12 Solutions

Fundamentals of Heat and Mass Transfer

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