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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, 30 ft long tubes The inside heat transfer coefficient, hi, = 1500 btu/hr-ft2-F 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 What is the air flow area, ft2? 150 What is the air density, lbs/ft3? 0.0673 What is the air volumetric flowrate, ft3/hr? 8127000 What is the air mass flowrate, lbs/hr? 546947.1 What is the air Reynold's number, Nre? 6605.641304 What is the air Prandtl number, Pr? 0.709876543 What is the air Nusselt number, Nu? 52.028 B What is the exchanger outside heat transfer coefficient, ho, btu/hr-ft2-F? 10.11
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, 30 ft long tubes The inside heat transfer coefficient, hi, = 1500 btu/hr-ft2-F 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 What is the air flow area, ft2? 150 What is the air density, lbs/ft3? 0.0673 What is the air volumetric flowrate, ft3/hr? 8127000 What is the air mass flowrate, lbs/hr? 546947.1 What is the air Reynold's number, Nre? 6605.641304 What is the air Prandtl number, Pr? 0.709876543 What is the air Nusselt number, Nu? 52.028 B What is the exchanger outside heat transfer coefficient, ho, btu/hr-ft2-F? 10.11
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