Chemical Engineering Question
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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The correct answers are shown. Please show me the steps to calculate these specific answers.
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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