A steam pipe [k = 65 W/(m °C)] having 80 mm inside diameter and 105 mm outside diameter is lagged with two insulation layers; the layer in contact with the pipe is 35 mm asbestos [k = 0.15 W/(m °C)] and it is covered with 25 mm thick magnesia insulation [k = 0.075 W/(m °C)]. The heat transfer coefficients for the inside and outside surfaces are 220 W/ (m2 °C) and 6.5 W/ (m2 °C) respectively. If the temperature of steam is 350 °C and the ambient temperature is 30 °C, calculate a) The steady loss of heat for 50 m length of pipe. b) The overall heat transfer coefficient based on inside and outside surfaces of the lagged steam pipe.
A steam pipe [k = 65 W/(m °C)] having 80 mm inside diameter and 105 mm outside diameter is lagged with two insulation layers; the layer in contact with the pipe is 35 mm asbestos [k = 0.15 W/(m °C)] and it is covered with 25 mm thick magnesia insulation [k = 0.075 W/(m °C)]. The heat transfer coefficients for the inside and outside surfaces are 220 W/ (m2 °C) and 6.5 W/ (m2 °C) respectively. If the temperature of steam is 350 °C and the ambient temperature is 30 °C, calculate a) The steady loss of heat for 50 m length of pipe. b) The overall heat transfer coefficient based on inside and outside surfaces of the lagged steam pipe.
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 8.36P
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A steam pipe [k = 65 W/(m °C)] having 80 mm inside diameter and 105 mm outside diameter is lagged with two insulation layers; the layer in contact with the pipe is 35 mm asbestos [k = 0.15 W/(m °C)] and it is covered with 25 mm thick magnesia insulation [k = 0.075 W/(m °C)]. The heat transfer coefficients for the inside and outside surfaces are 220 W/ (m2 °C) and 6.5 W/ (m2 °C) respectively. If the temperature of steam is 350 °C and the ambient temperature is 30 °C, calculate
a) The steady loss of heat for 50 m length of pipe.
b) The overall heat transfer coefficient based on inside and outside surfaces of the lagged steam pipe.
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