A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2⋅K when operating at design and clean conditions. Hot fluid enters the tube side at 93°C and exits at 71°C, while cold fluid enters the shell side at 27°C and exits at 38°C. After a period of use, built-up scale in the heat exchanger gives a fouling factor of 0.0004 m2⋅K/W. If the surface area is 93 m2, determine (a) the rate of heat transfer in the heat exchanger and (b) the mass flow rates of both hot and cold fluids. Assume both hot and cold fluids have a specific heat of 4.2 kJ/kg⋅K.
A counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2⋅K when operating at design and clean conditions. Hot fluid enters the tube side at 93°C and exits at 71°C, while cold fluid enters the shell side at 27°C and exits at 38°C. After a period of use, built-up scale in the heat exchanger gives a fouling factor of 0.0004 m2⋅K/W. If the surface area is 93 m2, determine (a) the rate of heat transfer in the heat exchanger and (b) the mass flow rates of both hot and cold fluids. Assume both hot and cold fluids have a specific heat of 4.2 kJ/kg⋅K.
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 counter-flow heat exchanger is stated to have an overall heat transfer coefficient of 284 W/m2⋅K when operating at design and clean conditions. Hot fluid enters the tube side at 93°C and exits at 71°C, while cold fluid enters the shell side at 27°C and exits at 38°C. After a period of use, built-up scale in the heat exchanger gives a fouling factor of 0.0004 m2⋅K/W. If the surface area is 93 m2, determine (a) the rate of heat transfer in the heat exchanger and (b) the mass flow rates of both hot and cold fluids. Assume both hot and cold fluids have a specific heat of 4.2 kJ/kg⋅K.
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