Lubricating oil used in the gearbox of a 14,000 rpm high speed blower is being recycled continuously through a double-pipe counterflow heat exchanger for cooling. The oil is to be cooled from 70°C to 40°C at the rate of 1000 kg/h using water entering at 28°C. The water temperature at the exit should not exceed 42°C. The specific heat of oil is 2.05 kJ/kg °C and that of water is 4.17 kJ/kg °C. Calculate the required rate of flow of water. If the heat exchange area is 3.0 m², calculate the overall heat transfer coefficient. m', 42°C 70°C 40°C m', 28°C
Lubricating oil used in the gearbox of a 14,000 rpm high speed blower is being recycled continuously through a double-pipe counterflow heat exchanger for cooling. The oil is to be cooled from 70°C to 40°C at the rate of 1000 kg/h using water entering at 28°C. The water temperature at the exit should not exceed 42°C. The specific heat of oil is 2.05 kJ/kg °C and that of water is 4.17 kJ/kg °C. Calculate the required rate of flow of water. If the heat exchange area is 3.0 m², calculate the overall heat transfer coefficient. m', 42°C 70°C 40°C m', 28°C
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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Transcribed Image Text:Lubricating oil used in the gearbox of a 14,000 rpm high speed blower is being
recycled continuously through a double-pipe counterflow heat exchanger for cooling. The oil is
to be cooled from 70ºC to 40°C at the rate of 1000 kg/h using water entering at 28°C. The water
temperature at the exit should not exceed 42°C. The specific heat of oil is 2.05 kJ/kg °C and that
of water is 4.17 kJ/kg °C. Calculate the required rate of flow of water. If the heat exchange area
is 3.0 m², calculate the overall heat transfer coefficient.
m', 42°C
T
40°C
m', 28°C
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