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A double pipe heat exchanger consisting of 1¼ in (schedule 40) inner pipe and 2 in (schedule 80) outer pipe is used to cool down 9000 Ibm/h of nitrobenzene from 220°F to 140°F. The cooling water available for this purpose enters at 80°F and leaves at 110°F. The cooling water is flowing in the inner pipe and its heat transfer coefficient is 80 Btu/h-ft².°F. Neglecting wall thermal resistance and assuming negligible viscosity correction factor, calculate the overall heat transfer coefficient and the total length of the pipe required for the exchanger. For the physical properties of the components involved, see the table below. (10)

A double pipe heat exchanger consisting of 1¼ in (schedule 40) inner pipe and 2 in (schedule 80) outer pipe is used to cool down 9000 Ibm/h of nitrobenzene from 220°F to 140°F. The cooling water available for this purpose enters at 80°F and leaves at 110°F. The cooling water is flowing in the inner pipe and its heat transfer coefficient is 80 Btu/h-ft².°F. Neglecting wall thermal resistance and assuming negligible viscosity correction factor, calculate the overall heat transfer coefficient and the total length of the pipe required for the exchanger. For the physical properties of the components involved, see the table below. (10)

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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A double pipe heat exchanger consisting of 1¼ in (schedule 40) inner pipe and 2 in (schedule 80) outer pipe is used to cool down 9000 Ibm/h of nitrobenzene from 220°F to 140°F. The cooling water available for this purpose enters at 80°F and leaves at 110°F. The cooling water is flowing in the inner pipe and its heat transfer coefficient is 80 Btu/h-ft².°F. Neglecting wall thermal resistance and assuming negligible viscosity correction factor, calculate the overall heat transfer coefficient and the total length of the pipe required for the exchanger. For the physical properties of the components involved, see the table below. (10)
Transcribed Image Text:A double pipe heat exchanger consisting of 1¼ in (schedule 40) inner pipe and 2 in (schedule 80) outer pipe is used to cool down 9000 Ibm/h of nitrobenzene from 220°F to 140°F. The cooling water available for this purpose enters at 80°F and leaves at 110°F. The cooling water is flowing in the inner pipe and its heat transfer coefficient is 80 Btu/h-ft².°F. Neglecting wall thermal resistance and assuming negligible viscosity correction factor, calculate the overall heat transfer coefficient and the total length of the pipe required for the exchanger. For the physical properties of the components involved, see the table below. (10)
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