4. An insulated steam pipe having outside diameter of 30 mm is to be covered with two layers of insulation, each having thickness of 20 mm. The thermal conductivity of one material is 0.08 and that of the other is 0.35 W/m °C. Assuming that the inner and outer surface temperatures of com- posite insulation are 150 °C and 25 °C respectively, how much (percentage) will heat transfer be increased (or decreased) when better insulation is next to the pipe than it is outer layer.
4. An insulated steam pipe having outside diameter of 30 mm is to be covered with two layers of insulation, each having thickness of 20 mm. The thermal conductivity of one material is 0.08 and that of the other is 0.35 W/m °C. Assuming that the inner and outer surface temperatures of com- posite insulation are 150 °C and 25 °C respectively, how much (percentage) will heat transfer be increased (or decreased) when better insulation is next to the pipe than it is outer layer.
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.
Chapter2: Steady Heat Conduction
Section: Chapter Questions
Problem 2.18P: Estimate the rate of heat loss per unit length from a 5-cm ID, 6-cm OD steel pipe covered with...
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