A one-dimensional plane wall is exposed to convective and radiative conditions at x = 0. The ambient and surrounding temperatures are T = 20°C and Tsur = 40°C, respectively. The convection heat transfer coefficient is h = 20 W/m².K, and the absorptivity of the exposed surface is a = 0.78. Determine the convective and radiative heat fluxes to the wall at x = 0, both in W/m2, if the wall surface temperature is T, = 32°C. Assume the exposed wall surface is gray, and the surroundings are large.

A one-dimensional plane wall is exposed to convective and radiative conditions at x = 0. The ambient and surrounding temperatures are T = 20°C and Tsur = 40°C, respectively. The convection heat transfer coefficient is h = 20 W/m².K, and the absorptivity of the exposed surface is a = 0.78. Determine the convective and radiative heat fluxes to the wall at x = 0, both in W/m2, if the wall surface temperature is T, = 32°C. Assume the exposed wall surface is gray, and the surroundings are large.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.45P

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

Heat transfer

A one-dimensional plane wall is exposed to convective and radiative conditions at x = 0. The ambient and surrounding temperatures
are T = 20°C and Tsur = 40°C, respectively. The convection heat transfer coefficient is h = 20 W/m².K, and the absorptivity of the
exposed surface is a = 0.78. Determine the convective and radiative heat fluxes to the wall at x = 0, both in W/m2, if the wall surface
temperature is T, = 32°C. Assume the exposed wall surface is gray, and the surroundings are large.
acony =
=
1
W/m²
W/m²
Attor

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A one-dimensional plane wall is exposed to convective and radiative conditions at x = 0. The ambient and surrounding temperatures are T, = 20°C and Tsur = 40°C, respectively. The convection heat transfer coefficient is h = 20 W/m2-K, and the absorptivity of the exposed surface is a = 0.78. Determine the convective and radiative heat fluxes to the wall at x = 0, both in W/m2, if the wall surface temperature is T, = 29°C. Assume the exposed wall surface is gray, and the surroundings are large. qlony i W/m2 g" i W/m? drad
A one-dimensional plane wall is exposed to convective and radiative conditions at x = 0. The ambient and surrounding temperatures are T. = 20°C and Tgur = 40°C, respectively. The convection heat transfer coefficient is h = 20 W/m2-K, and the absorptivity of the exposed surface is a = 0.78. Determine the convective and radiative heat fluxes to the wall at.x = 0, both in W/m?, if the wall surface temperature is T, = 30°C. Assume the exposed wall surface is gray, and the surroundings are large. g'ony W/m? W/m2 %3D
A one-dimensional plane wall is exposed to convective and radiative conditions at x = 0. The ambient and surrounding temperatures are T = 20°C and Tsur = 40°C, respectively. The convection heat transfer coefficient is h = 20 W/m².K, and the absorptivity of the exposed surface is a = 0.78. Determine the convective and radiative heat fluxes to the wall at x = 0, both in W/m², if the wall surface temperature is T = 25°C. Assume the exposed wall surface is gray, and the surroundings are large. q'conv i W/m² = grad = i W/m²
A one-dimensional plane wall is exposed to convective and radiative conditions at x = 0. The ambient and surrounding temperatures are T = 15C and Tsur = 80C, respectively. The convection heat transfer coefficient is h = 40 W/(m2K) and the absorptivity of the exposed surface is  = 0.8. Determine the convective and radiative heat fluxes to the wall at x = 0 in W/m2, if the wall surface temperature is 24C. Assume the exposed wall surface is gray (meaning  = ) and the surroundings are much larger than the wall surface.
A one-dimensional plane wall is exposed to convective and radiative conditions at x = 0. The ambient and surrounding temperatures are I = 20°C and Isur = 40°C, respectively. The convection heat transfer coefficient is h = 20 W/m².K, and the absorptivity of the exposed surface is a = 0.78. Determine the convective and radiative heat fluxes to the wall at x = 0, both in W/m2, if the wall surface temperature is I = 28°C. Assume the exposed wall surface is gray, and the surroundings are large. = 9 conv i W/m² 9rad i W/m²