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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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<p A horizontal tube-bundle air-cooled exchanger is used to condense steam at 250 F and has the following specifications: Tube Bundle: Steam is flowing inside the tubes tube od 1 in ; tube id 0.834 in ; tube pitch = 2 in (square pitch); k = 26 btu/ft-hr-F There are 10 tube rows with each row containing 60 tubes 30 ft long The inside heat transfer coefficient, hi, = 1200 btu/hr-ft2-F The tubes are "finned" resulting in a total outside surface area of 3.8 ft2/ft; The fin efficiency is 0.95 The area of the bare tube exposed (not covered by the fins) is 0.2 ft2/ft Air-side: Air is flowing outside and perpendicular to the tubes at 15.05 ft/s Air enters the exchanger at 80F and leaves at 180F Air properties at the Air bulk temperature are as follows: Air is at atmosheric pressure viscosity = 0.046 lb/ft-h Cp = 0.25 btu/lb-F k = 0.0162 btu/ft-h-F Fa (air flow arrangement factor) can be assummed to be 0.95 *** You can enter small numbers in scientific notation form (ie 0.0042 as 4.2e-3) What is the tube inside film resistance, Rhi, hr-ft2-F/btu? What is the tube outside film resistance, Rho, hr-ft2-F/btu? What is the tube wall resistance, Rwall, hr-ft2-F/btu? What is the overall heat transfer coefficient, Ui, btu/hr-ft2-F? What is the lmtd F? What is the total exchanger inside area, Aitotal, ft2? What is the exchanger heat duty btu/hr?
Transcribed Image Text:<p A horizontal tube-bundle air-cooled exchanger is used to condense steam at 250 F and has the following specifications: Tube Bundle: Steam is flowing inside the tubes tube od 1 in ; tube id 0.834 in ; tube pitch = 2 in (square pitch); k = 26 btu/ft-hr-F There are 10 tube rows with each row containing 60 tubes 30 ft long The inside heat transfer coefficient, hi, = 1200 btu/hr-ft2-F The tubes are "finned" resulting in a total outside surface area of 3.8 ft2/ft; The fin efficiency is 0.95 The area of the bare tube exposed (not covered by the fins) is 0.2 ft2/ft Air-side: Air is flowing outside and perpendicular to the tubes at 15.05 ft/s Air enters the exchanger at 80F and leaves at 180F Air properties at the Air bulk temperature are as follows: Air is at atmosheric pressure viscosity = 0.046 lb/ft-h Cp = 0.25 btu/lb-F k = 0.0162 btu/ft-h-F Fa (air flow arrangement factor) can be assummed to be 0.95 *** You can enter small numbers in scientific notation form (ie 0.0042 as 4.2e-3) What is the tube inside film resistance, Rhi, hr-ft2-F/btu? What is the tube outside film resistance, Rho, hr-ft2-F/btu? What is the tube wall resistance, Rwall, hr-ft2-F/btu? What is the overall heat transfer coefficient, Ui, btu/hr-ft2-F? What is the lmtd F? What is the total exchanger inside area, Aitotal, ft2? What is the exchanger heat duty btu/hr?
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