A standard 1-in schedule 40 steel pipe carries saturated steam at 250oF. The pipe is insulated with a 3-in layer of magnesia and outside od magnesia there is a 0.8 in layer of cork. The inside temperature of the pipe wall is 300oF and the outside temperature of the cork is 85oF. Thermal conductivities in for steel, magnesia and cork are 26 Btu/ft-hr-oF, 0.034 Btu/ft-hr-oF and 0.03 Btu/ft-hr-oF, respectively. a) By using your knowledge of the kinetic theory and fundamental of heat transfer, to explain how heat energy is transferred by conduction in steels, magnesia and cork and by convection in gases. b) Calculate the heat loss if the length of the pipe is 100 ft in Btu/hr.
A standard 1-in schedule 40 steel pipe carries saturated steam at 250oF. The pipe is insulated with a 3-in layer of magnesia and outside od magnesia there is a 0.8 in layer of cork. The inside temperature of the pipe wall is 300oF and the outside temperature of the cork is 85oF. Thermal conductivities in for steel, magnesia and cork are 26 Btu/ft-hr-oF, 0.034 Btu/ft-hr-oF and 0.03 Btu/ft-hr-oF, respectively. a) By using your knowledge of the kinetic theory and fundamental of heat transfer, to explain how heat energy is transferred by conduction in steels, magnesia and cork and by convection in gases. b) Calculate the heat loss if the length of the pipe is 100 ft in Btu/hr.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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A standard 1-in schedule 40 steel pipe carries saturated steam at 250oF. The pipe is insulated with a 3-in layer of magnesia and outside od magnesia there is a 0.8 in layer of cork. The inside temperature of the pipe wall is 300oF and the outside temperature of the cork is 85oF. Thermal conductivities in for steel, magnesia and cork are 26 Btu/ft-hr-oF, 0.034 Btu/ft-hr-oF and 0.03 Btu/ft-hr-oF, respectively.
a) By using your knowledge of the kinetic theory and fundamental of heat transfer, to
explain how heat energy is transferred by conduction in steels, magnesia and cork
and by convection in gases.
b) Calculate the heat loss if the length of the pipe is 100 ft in Btu/hr.
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