Answered: Heat transfer through composite walls…

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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Heat transfer through composite walls

The wall of a refrigerated van is of 1.5 mm steel sheet at the outer surface, 10 mm plywood at the inner surface and 2 cm of glass-wool in between. Calculate the rate of heat flow if the temperatures of the inside and outside surfaces are -15⁰C and 24⁰C.

Take k(steel) = 23.2 Wm^-1K^-1

k(glass-wool) = 0.014 Wm^-1K^-1

k(plywood) = 0.052 Wm^-1K^-1.

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Water at 20°C is pumped through a smooth 12-cm-diameter pipe 10 kmlong, at a flow rate of 75 m³/h. The inlet is fed by a pump at an absolute pressure of 4 MPa.
The exit is at standard atmospheric pressure (101 kPa) and is 200 m higher.

Calculate the frictional head loss H_f and compare it to the velocity head of the flow.

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