Fa (air flow arrangement factor) can be assummed to be 0.95 What is the air flow area, ft2? What is the air density, lbs/ft3? What is the air volumetric flowrate, ft3/hr? What is the air mass flowrate, lbs/hr? What is the air Reynold's number, Nre? What is the air Prandtl number, Pr? What is the air Nusselt number, Nu? What is the exchanger outside heat transfer coefficient, ho, btu/hr-ft2-F?
Fa (air flow arrangement factor) can be assummed to be 0.95 What is the air flow area, ft2? What is the air density, lbs/ft3? What is the air volumetric flowrate, ft3/hr? What is the air mass flowrate, lbs/hr? What is the air Reynold's number, Nre? What is the air Prandtl number, Pr? What is the air Nusselt number, Nu? What is the exchanger outside heat transfer coefficient, ho, btu/hr-ft2-F?
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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Transcribed Image Text:Fa (air flow arrangement factor) can be assummed to be 0.95
What is the air flow area, ft2?
What is the air density, lbs/ft3?
What is the air volumetric flowrate, ft3/hr?
What is the air mass flowrate, lbs/hr?
What is the air Reynold's number, Nre?
What is the air Prandtl number, Pr?
What is the air Nusselt number, Nu?
What is the exchanger outside heat transfer coefficient, ho, btu/hr-ft2-F?
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 assumed to be 0.95
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