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A shell-and-tube heat exchanger is to heat an acidic liquid 1. that flows in unfinned tubes of inside and outside diame- jod ters D₁ = 10 mm and D. = 11 mm, respectively. A hot zizyl 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 (P₂ = 1780 kg/m³, k₁ = 0.17 W/m . K). The inner and outer heat transfer coefficients are h; = 1500 W/m² - K and h = 200 W/m² K, respectively. dul 7 · == (a) Determine the ratio of plastic to metal tube surface areas needed to transfer heat at the same rate. shuo (b) Determine the ratio of plastic to metal mass associ- ated with the two heat exchanger designs. edte 5°7 Ons (c) The cost of the metal alloy per unit mass is three slumus times that of the plastic. Determine which tube di ei ter material should be specified on the basis of cost.

A shell-and-tube heat exchanger is to heat an acidic liquid 1. that flows in unfinned tubes of inside and outside diame- jod ters D₁ = 10 mm and D. = 11 mm, respectively. A hot zizyl 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 (P₂ = 1780 kg/m³, k₁ = 0.17 W/m . K). The inner and outer heat transfer coefficients are h; = 1500 W/m² - K and h = 200 W/m² K, respectively. dul 7 · == (a) Determine the ratio of plastic to metal tube surface areas needed to transfer heat at the same rate. shuo (b) Determine the ratio of plastic to metal mass associ- ated with the two heat exchanger designs. edte 5°7 Ons (c) The cost of the metal alloy per unit mass is three slumus times that of the plastic. Determine which tube di ei ter material should be specified on the basis of cost.

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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A shell-and-tube heat exchanger is to heat an acidic liquid 1. that flows in unfinned tubes of inside and outside diame- jod ters D₁ = 10 mm and D. = 11 mm, respectively. A hot zizyl 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 (P₂ = 1780 kg/m³, k₁ = 0.17 W/m . K). The inner and outer heat transfer coefficients are h; = 1500 W/m² - K and h = 200 W/m² K, respectively. dul 7 · == (a) Determine the ratio of plastic to metal tube surface areas needed to transfer heat at the same rate. shuo (b) Determine the ratio of plastic to metal mass associ- ated with the two heat exchanger designs. edte 5°7 Ons (c) The cost of the metal alloy per unit mass is three slumus times that of the plastic. Determine which tube di ei ter material should be specified on the basis of cost.
Transcribed Image Text:A shell-and-tube heat exchanger is to heat an acidic liquid 1. that flows in unfinned tubes of inside and outside diame- jod ters D₁ = 10 mm and D. = 11 mm, respectively. A hot zizyl 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 (P₂ = 1780 kg/m³, k₁ = 0.17 W/m . K). The inner and outer heat transfer coefficients are h; = 1500 W/m² - K and h = 200 W/m² K, respectively. dul 7 · == (a) Determine the ratio of plastic to metal tube surface areas needed to transfer heat at the same rate. shuo (b) Determine the ratio of plastic to metal mass associ- ated with the two heat exchanger designs. edte 5°7 Ons (c) The cost of the metal alloy per unit mass is three slumus times that of the plastic. Determine which tube di ei ter material should be specified on the basis of cost.
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