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A counter-flow double-pipe heat exchanger is to heat water from 20°C to 80°C at a rate of 1.2 kg/s as shown in Figure Q3 (b). The heating is to be accomplished by geothermal water available at 160°C with a mass flow rate of 2 kg/s. The

A counter-flow double-pipe heat exchanger is to heat water from 20°C to 80°C at a rate of 1.2 kg/s as shown in Figure Q3 (b). The heating is to be accomplished by geothermal water available at 160°C with a mass flow rate of 2 kg/s. The

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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A counter-flow double-pipe heat exchanger is to heat water from 20°C to 80°C at a rate of 1.2 kg/s as shown in Figure Q3 (b). The heating is to be accomplished by geothermal water available at 160°C with a mass flow rate of 2 kg/s. The inner tube is thin-walled and has a diameter of 1.5 cm. If the overall heat transfer coefficient of the heat exchanger is 640 W/m².°C, determine the length of the heat exchanger required to achieve the desired heating. Given that the specific heats of water and geothermal fluid to be 4.18 and 4.31 kJ/kg·°C, respectively. (b) Hot geothermal 1160°C water 2 kg/s Cold water 20°C 80°C 1.2 kg/s D= 1.5 cm Figure Q3 (b) (i) Using LMTD method. (ii) Using NTU method, with NTU = In ). c-1 EC-1.
Transcribed Image Text:A counter-flow double-pipe heat exchanger is to heat water from 20°C to 80°C at a rate of 1.2 kg/s as shown in Figure Q3 (b). The heating is to be accomplished by geothermal water available at 160°C with a mass flow rate of 2 kg/s. The inner tube is thin-walled and has a diameter of 1.5 cm. If the overall heat transfer coefficient of the heat exchanger is 640 W/m².°C, determine the length of the heat exchanger required to achieve the desired heating. Given that the specific heats of water and geothermal fluid to be 4.18 and 4.31 kJ/kg·°C, respectively. (b) Hot geothermal 1160°C water 2 kg/s Cold water 20°C 80°C 1.2 kg/s D= 1.5 cm Figure Q3 (b) (i) Using LMTD method. (ii) Using NTU method, with NTU = In ). c-1 EC-1.
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