A shell-and-tube heat exchanger is to heat an acidic liquid that flows in unfinned tubes of inside and outside diameters D¡ = 10 mm and Do = 11 mm, respectively. A hot gas flows on the shell side. To avoid corrosion of the tube material, the engineer may specify either a Ni-Cr-Mo corrosion- resistant metal alloy (pm = 8900 kg/m³, km= 8 W/m-K) or a polyvinylidene fluoride (PVDF) plastic (Pp = 1780 kg/m3, kp = 0.17 W/m·K). The inner and outer heat transfer coefficients are h¡ = 1500 W/m²-K and ho = 200 W/m²-K, respectively. %3D %3D %3D а) Please calculate the thermal resistance per unit length for inner flow (Rconv,i), outer flow (Rconv,o), tube wall-plastic (Rw,plastic), and tube wall-plastic (Rw,metal). b) Determine the ratio of plastic to metal tube surface areas needed to transfer the same amount of heat.
A shell-and-tube heat exchanger is to heat an acidic liquid that flows in unfinned tubes of inside and outside diameters D¡ = 10 mm and Do = 11 mm, respectively. A hot gas flows on the shell side. To avoid corrosion of the tube material, the engineer may specify either a Ni-Cr-Mo corrosion- resistant metal alloy (pm = 8900 kg/m³, km= 8 W/m-K) or a polyvinylidene fluoride (PVDF) plastic (Pp = 1780 kg/m3, kp = 0.17 W/m·K). The inner and outer heat transfer coefficients are h¡ = 1500 W/m²-K and ho = 200 W/m²-K, respectively. %3D %3D %3D а) Please calculate the thermal resistance per unit length for inner flow (Rconv,i), outer flow (Rconv,o), tube wall-plastic (Rw,plastic), and tube wall-plastic (Rw,metal). b) Determine the ratio of plastic to metal tube surface areas needed to transfer the same amount of heat.
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:A shell-and-tube heat exchanger is to heat an acidic liquid that flows in unfinned tubes of inside
and outside diameters D¡ = 10 mm and Do = 11 mm, respectively. A hot gas flows on the shell side.
To avoid corrosion of the tube material, the engineer may specify either a Ni-Cr-Mo corrosion-
resistant metal alloy (pm = 8900 kg/m³, km= 8 W/m-K) or a polyvinylidene fluoride (PVDF) plastic
(Pp = 1780 kg/m3, kp = 0.17 W/m·K). The inner and outer heat transfer coefficients are h¡ = 1500
W/m²-K and ho = 200 W/m²-K, respectively.
%3D
%3D
%3D
а)
Please calculate the thermal resistance per unit length for inner flow (Rconv,i), outer
flow (Rconv,o), tube wall-plastic (Rw,plastic), and tube wall-plastic (Rw,metal).
b)
Determine the ratio of plastic to metal tube surface areas needed to transfer the same
amount of heat.
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