It is desired to cool 100 ton./h (tons/hour) of a mixture of hydrocarbons from 90 ºC to 60 ºC in a heat exchanger. The mixture of hydrocarbons has an average heat capacity at constant pressure representative of the mixture of 0.45 kcal(kg o C). The heat exchange process will use liquid water at 20°C as a cold fluid, which is desired to leave the exchanger at 40°C so that it becomes available for another part of the process. The heat capacity at constant pressure of water can be assumed to be 1.0 kcal/(kg ºC).What is the required mass flow rate of water in ton/h?What is the heat exchanged in the system in kcal/h?Consider a double tube heat exchanger operating in parallel, with U=600 Kcal/(h m2 ºC) and tubes with the following dimensions: outer tube with Di =8.0cm and De =8.9cm; inner tube di =5.3cm and =6.0cm. What is the average temperature difference of the operation and the total length of this exchanger?Same as above, but with operation in opposite currents. What is the average operating temperature difference if the total length of this exchanger is in meters?

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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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It is desired to cool 100 ton./h (tons/hour) of a mixture of hydrocarbons from 90 ºC to 60 ºC in a heat exchanger. The mixture of hydrocarbons has an average heat capacity at constant pressure representative of the mixture of 0.45 kcal(kg o C). The heat exchange process will use liquid water at 20°C as a cold fluid, which is desired to leave the exchanger at 40°C so that it becomes available for another part of the process. The heat capacity at constant pressure of water can be assumed to be 1.0 kcal/(kg ºC).

What is the required mass flow rate of water in ton/h?
What is the heat exchanged in the system in kcal/h?
Consider a double tube heat exchanger operating in parallel, with U=600 Kcal/(h m2 ºC) and tubes with the following dimensions: outer tube with Di =8.0cm and De =8.9cm; inner tube di =5.3cm and =6.0cm. What is the average temperature difference of the operation and the total length of this exchanger?
Same as above, but with operation in opposite currents. What is the average operating temperature difference if the total length of this exchanger is in meters?

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