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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.

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.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
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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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  1. 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 Hf and compare it to the velocity head of the flow.

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