4. A copper-plate fin of rectangular cross-section having thickness t = 1 mm, height L= 10 mm and thermal conductivity k= 380 W/(m-K) are attached to a plane wall maintained at a temperature T, = 230°C. Fins dissipate heat by convection into ambient air T = 30°C with a heat transfer coefficient h = 40 W/(m²-K). Fins are spaced at 8 mm (that is 125 fins per meter). Assume %3D negligible heat loss form the tip. (a) Determine the fin efficiency. (b) Determine the net rate of heat transfer per square meter of plane wall surface. (c) What would be the heat transfer rate from the plane wall if there were no fins attached?

4. A copper-plate fin of rectangular cross-section having thickness t = 1 mm, height L= 10 mm and thermal conductivity k= 380 W/(m-K) are attached to a plane wall maintained at a temperature T, = 230°C. Fins dissipate heat by convection into ambient air T = 30°C with a heat transfer coefficient h = 40 W/(m²-K). Fins are spaced at 8 mm (that is 125 fins per meter). Assume %3D negligible heat loss form the tip. (a) Determine the fin efficiency. (b) Determine the net rate of heat transfer per square meter of plane wall surface. (c) What would be the heat transfer rate from the plane wall if there were no fins attached?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

4. A copper-plate fin of rectangular cross-section having thicknesst=1 mm, height L=10 mm and
thermal conductivity k= 380 W/(m-K) are attached to a plane wall maintained at a temperature
T, = 230°C. Fins dissipate heat by convection into ambient air T = 30°C with a heat transfer
coefficient h = 40 W/(m²-K). Fins are spaced at 8 mm (that is 125 fins per meter). Assume
negligible heat loss form the tip. (a) Determine the fin efficiency. (b) Determine the net rate
of heat transfer per square meter of plane wall surface. (c) What would be the heat transfer
rate from the plane wall if there were no fins attached?
1

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