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Water at a rate of m=63 g/s at 38°C is available for use as a coolant in a double- bipe heat exchanger whose total surface area is 1.4 m². The water is to be used o cool an oil (Cp=2.09 kJ/kg K) from an initial temperature of 121°C. Because of other circumstances, an exit water temperature greater than 99°C cannot be allowed. The exit temperature of the oil must not be below 60°C. The overall heat ransfer coefficient is 284 W/m? K, and is assumed to be independent of flowrate of either stream in the range of interest. Estimate the maximum flowrate of oil hat may be cooled for cocurrent and countercurrent exchangers, assuming the lowrate of water is fixed at 63 g/s.

Water at a rate of m=63 g/s at 38°C is available for use as a coolant in a double- bipe heat exchanger whose total surface area is 1.4 m². The water is to be used o cool an oil (Cp=2.09 kJ/kg K) from an initial temperature of 121°C. Because of other circumstances, an exit water temperature greater than 99°C cannot be allowed. The exit temperature of the oil must not be below 60°C. The overall heat ransfer coefficient is 284 W/m? K, and is assumed to be independent of flowrate of either stream in the range of interest. Estimate the maximum flowrate of oil hat may be cooled for cocurrent and countercurrent exchangers, assuming the lowrate of water is fixed at 63 g/s.

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
Problem 1.1P
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Water at a rate of m=63 g/s at 38°C is available for use as a coolant in a double- pipe heat exchanger whose total surface area is 1.4 m?. The water is to be used to cool an oil (Cp=2.09 kJ/kg K) from an initial temperature of 121°C. Because of other circumstances, an exit water temperature greater than 99°C cannot be allowed. The exit temperature of the oil must not be below 60°C. The overall heat transfer coefficient is 284 W/m? K, and is assumed to be independent of flowrate of either stream in the range of interest. Estimate the maximum flowrate of oil that may be cooled for cocurrent and countercurrent exchangers, assuming the flowrate of water is fixed at 63 g/s.
Transcribed Image Text:Water at a rate of m=63 g/s at 38°C is available for use as a coolant in a double- pipe heat exchanger whose total surface area is 1.4 m?. The water is to be used to cool an oil (Cp=2.09 kJ/kg K) from an initial temperature of 121°C. Because of other circumstances, an exit water temperature greater than 99°C cannot be allowed. The exit temperature of the oil must not be below 60°C. The overall heat transfer coefficient is 284 W/m? K, and is assumed to be independent of flowrate of either stream in the range of interest. Estimate the maximum flowrate of oil that may be cooled for cocurrent and countercurrent exchangers, assuming the flowrate of water is fixed at 63 g/s.
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