A desublimation heat exchanger is to be sized for recovery of 100 kg/h of naphthalene (N) from a gas stream, where the other components are noncondensable. The heat-exchanger tubes are 1 m long with an outside diameter of 2.5 cm. Tube spacing is such that N can build up to a maximum thickness of 1.25 cm. The gas enters the unit at 800 torr and 80oC with a mole fraction for N of 0.0095. The water coolant flows through the inside of the tubes countercurrently to the gas. Cooling water enters at 25C and exits at 45oC. Determine the number of tubes needed and the time required to reach the maximum thickness if the gas leaves at 60oC.
A desublimation heat exchanger is to be sized for recovery of 100 kg/h of naphthalene (N) from a gas stream, where the other components are noncondensable. The heat-exchanger tubes are 1 m long with an outside diameter of 2.5 cm. Tube spacing is such that N can build up to a maximum thickness of 1.25 cm. The gas enters the unit at 800 torr and 80oC with a mole fraction for N of 0.0095. The water coolant flows through the inside of the tubes countercurrently to the gas. Cooling water enters at 25C and exits at 45oC. Determine the number of tubes needed and the time required to reach the maximum thickness if the gas leaves at 60oC.
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 desublimation heat exchanger is to be sized for recovery of 100 kg/h of naphthalene (N) from a gas stream, where the other components are noncondensable. The heat-exchanger tubes are 1 m long with an outside diameter of 2.5 cm. Tube spacing is such that N can build up to a maximum thickness of 1.25 cm. The gas enters the unit at 800 torr and 80oC with a mole fraction for N of 0.0095. The water coolant flows through the inside of the tubes countercurrently to the gas. Cooling water enters at 25C and exits at 45oC. Determine the number of tubes needed and the time required to reach the maximum thickness if the gas leaves at 60oC.
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