A counterflow heat exchanger is used to cool the lubricating oil for a large industrial gas turbine engine. The flow rate of cooling water through the inner tube (Di=25 mm) is 0.2 kg/s, while the flow rate of oil through the outside of tubes (Do=45 mm) is 0.1 kg/s. The oil and water enter at temperatures of 100 and 30oC, respectively. How long must the tube be made if the outlet temperature of the oil is to be 60oC? The outside (oil side) convection coefficient is 38.4 W/m2 .K. For oil you can use the following data: Specific heat: 2131 J/kg K; viscosity:0.0325 Ns/m2 ; thermal conductivity: 0.138 W/mK.
A counterflow heat exchanger is used to cool the lubricating oil for a large industrial gas turbine engine. The flow rate of cooling water through the inner tube (Di=25 mm) is 0.2 kg/s, while the flow rate of oil through the outside of tubes (Do=45 mm) is 0.1 kg/s. The oil and water enter at temperatures of 100 and 30oC, respectively. How long must the tube be made if the outlet temperature of the oil is to be 60oC? The outside (oil side) convection coefficient is 38.4 W/m2 .K. For oil you can use the following data: Specific heat: 2131 J/kg K; viscosity:0.0325 Ns/m2 ; thermal conductivity: 0.138 W/mK.
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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Question
A counterflow heat exchanger is used to cool the lubricating oil for a large industrial gas
turbine engine. The flow rate of cooling water through the inner tube (Di=25 mm) is 0.2 kg/s,
while the flow rate of oil through the outside of tubes (Do=45 mm) is 0.1 kg/s. The oil and
water enter at temperatures of 100 and 30oC, respectively. How long must the tube be made
if the outlet temperature of the oil is to be 60oC? The outside (oil side) convection coefficient
is 38.4 W/m2
.K.
For oil you can use the following data: Specific heat: 2131 J/kg K; viscosity:0.0325 Ns/m2
;
thermal conductivity: 0.138 W/mK.
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