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Energy Balances and Insulation - Steam at 400°F is flowing through a steel pipe (k = 8.7 Btu/h•ft•°F) with an inner diameter of 4.5 in and an outer diameter of 5.0 in. The convection heat transfer coefficient on the inside of the pipe is 40 Btu/h•ft2.°F. The pipe is insulated with a 2-in thick layer of fiberglass insulation (k = 0.020 Btu/h·ft•°F), and the pipe system is located in an environment at 25°F with a convection heat transfer coefficient of 5 Btu/h·ft²-.°F. Calculate the rate of heat loss from the steam per foot of pipe length neglecting radiation heat transfer with the surroundings. Determine the error involved if neglecting the thermal resistance of the steel pipe in the calculations, e.g. solve the problem assuming the pipe wall were NOT present and compare to the actual system with the wall thickness as an additional resistance.

Energy Balances and Insulation - Steam at 400°F is flowing through a steel pipe (k = 8.7 Btu/h•ft•°F) with an inner diameter of 4.5 in and an outer diameter of 5.0 in. The convection heat transfer coefficient on the inside of the pipe is 40 Btu/h•ft2.°F. The pipe is insulated with a 2-in thick layer of fiberglass insulation (k = 0.020 Btu/h·ft•°F), and the pipe system is located in an environment at 25°F with a convection heat transfer coefficient of 5 Btu/h·ft²-.°F. Calculate the rate of heat loss from the steam per foot of pipe length neglecting radiation heat transfer with the surroundings. Determine the error involved if neglecting the thermal resistance of the steel pipe in the calculations, e.g. solve the problem assuming the pipe wall were NOT present and compare to the actual system with the wall thickness as an additional resistance.

Introduction to Chemical Engineering Thermodynamics
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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Energy Balances and Insulation - Steam at 400°F is flowing through a steel pipe (k = 8.7 Btu/h•ft•°F) with an inner diameter of 4.5 in and an outer diameter of 5.0 in. The convection heat transfer coefficient on the inside of the pipe is 40 Btu/h•ft2.°F. The pipe is insulated with a 2-in thick layer of fiberglass insulation (k = 0.020 Btu/h·ft•°F), and the pipe system is located in an environment at 25°F with a convection heat transfer coefficient of 5 Btu/h·ft²-.°F. Calculate the rate of heat loss from the steam per foot of pipe length neglecting radiation heat transfer with the surroundings. Determine the error involved if neglecting the thermal resistance of the steel pipe in the calculations, e.g. solve the problem assuming the pipe wall were NOT present and compare to the actual system with the wall thickness as an additional resistance.
Transcribed Image Text:Energy Balances and Insulation - Steam at 400°F is flowing through a steel pipe (k = 8.7 Btu/h•ft•°F) with an inner diameter of 4.5 in and an outer diameter of 5.0 in. The convection heat transfer coefficient on the inside of the pipe is 40 Btu/h•ft2.°F. The pipe is insulated with a 2-in thick layer of fiberglass insulation (k = 0.020 Btu/h·ft•°F), and the pipe system is located in an environment at 25°F with a convection heat transfer coefficient of 5 Btu/h·ft²-.°F. Calculate the rate of heat loss from the steam per foot of pipe length neglecting radiation heat transfer with the surroundings. Determine the error involved if neglecting the thermal resistance of the steel pipe in the calculations, e.g. solve the problem assuming the pipe wall were NOT present and compare to the actual system with the wall thickness as an additional resistance.
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