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Problem # 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 D, = 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 hi = 1500 W/m2-K and ho = 200 W/m²-K, respectively. %3D %3D %3D a) Please calculate the thermal resistance per unit length for inner flow (R'onv,i), outer flow (Rconv,o), tube wall-plastic (Rw,plastic), and tube wall-plastic (Rw,metal). Determine the ratio of plastic to metal tube surface areas needed to transfer the same an.ount of heat.

Problem # 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 D, = 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 hi = 1500 W/m2-K and ho = 200 W/m²-K, respectively. %3D %3D %3D a) Please calculate the thermal resistance per unit length for inner flow (R'onv,i), outer flow (Rconv,o), tube wall-plastic (Rw,plastic), and tube wall-plastic (Rw,metal). Determine the ratio of plastic to metal tube surface areas needed to transfer the same an.ount of heat.

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
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Problem # 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/m², 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. a) Please calculate the thermal resistance per unit length for inner flow (Rconvi), outer flow (Rconv,o), tube wall-plastic (Rw,plastic), and tube wall-plastic (Rw,metat). b) Determine the ratio of plastic to metal tube surface areas needed to transfer the same an.ount of heat.
Transcribed Image Text:Problem # 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/m², 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. a) Please calculate the thermal resistance per unit length for inner flow (Rconvi), outer flow (Rconv,o), tube wall-plastic (Rw,plastic), and tube wall-plastic (Rw,metat). b) Determine the ratio of plastic to metal tube surface areas needed to transfer the same an.ount of heat.
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