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.
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.
Chapter1: Basic Modes Of Heat Transfer
Section: Chapter Questions
Problem 1.18P: The heat transfer coefficient for a gas flowing over a thin float plate 3-m long and 0.3-m wide...
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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 Hf and compare it to the velocity head of the flow.
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