Find the total rate of heat transfer through the wall in W.

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 8.8P
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The wall of a box furnace is made of a composite material. Layer A is directly in contact with the combustion gases inside the furnace and it has a
thickness of 0.026 m, a thermal conductivity of 138 W/m-K, and a cross-sectional area of 0.27 m². On the other hand, Layer C corresponds to the
outermost layer that is in direct contact with the ambient air. It has a thickness of 0.045 m, a thermal conductivity of 3 W/m-K, and has the same
cross-sectional area as Layer A. In between Layer A and Layer C are two parallel layers: Layer B and Layer D. Layer B has the same cross-
sectional area as Layer D. The thickness of Layer B and Layer D is 0.063 m. Layer B has a thermal conductivity of 10 W/m-K; while, Layer D has a
thermal conductivity of 20 W/m-K. The combustion gases inside the furnace has a temperature of 360 °C; while, the ambient air has a
W
W
temperature of 32 °C. Finally, the convection heat transfer coefficients at the inside and outside of the wall are 148
respectively. Find the total rate of heat transfer through the wall in W.
2
m². K
and 34
m².K
Transcribed Image Text:The wall of a box furnace is made of a composite material. Layer A is directly in contact with the combustion gases inside the furnace and it has a thickness of 0.026 m, a thermal conductivity of 138 W/m-K, and a cross-sectional area of 0.27 m². On the other hand, Layer C corresponds to the outermost layer that is in direct contact with the ambient air. It has a thickness of 0.045 m, a thermal conductivity of 3 W/m-K, and has the same cross-sectional area as Layer A. In between Layer A and Layer C are two parallel layers: Layer B and Layer D. Layer B has the same cross- sectional area as Layer D. The thickness of Layer B and Layer D is 0.063 m. Layer B has a thermal conductivity of 10 W/m-K; while, Layer D has a thermal conductivity of 20 W/m-K. The combustion gases inside the furnace has a temperature of 360 °C; while, the ambient air has a W W temperature of 32 °C. Finally, the convection heat transfer coefficients at the inside and outside of the wall are 148 respectively. Find the total rate of heat transfer through the wall in W. 2 m². K and 34 m².K
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