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Q2. An oil cooler consists of a straight tube of 20 mm O.D. and 16 mm I.D. enclosed within a pipe and concentric with it. The external pipe is well insulated. Hot oil flows through a tube at the rate of 0.05 kg/s (c, = 2000 J/kg°C) and cooling water flows in the annulus in opposite direction at the rate of 0.1 kg/s (c, = 4000 J/kg°C). The oil enters the cooler at 130°C and leaves at 80°C, while the cold liquid enters at 30°C. Calculate the length of the tube required if heat transfer coefficient from oil to tube is 2000 W/m²°C and from surface to water is 4000 W/M²°C. Neglect the resistance of the tube wall. (Ans. 1.04 m)

Q2. An oil cooler consists of a straight tube of 20 mm O.D. and 16 mm I.D. enclosed within a pipe and concentric with it. The external pipe is well insulated. Hot oil flows through a tube at the rate of 0.05 kg/s (c, = 2000 J/kg°C) and cooling water flows in the annulus in opposite direction at the rate of 0.1 kg/s (c, = 4000 J/kg°C). The oil enters the cooler at 130°C and leaves at 80°C, while the cold liquid enters at 30°C. Calculate the length of the tube required if heat transfer coefficient from oil to tube is 2000 W/m²°C and from surface to water is 4000 W/M²°C. Neglect the resistance of the tube wall. (Ans. 1.04 m)

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
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Q2. An oil cooler consists of a straight tube of 20 mm O.D. and 16 mm I.D. enclosed within a pipe and concentric with it. The external pipe is well insulated. Hot oil flows through a tube at the rate of 0.05 kg/s (c, = 2000 J/kg°C) and cooling water flows in the annulus in opposite direction at the rate of 0.1 kg/s (c, = 4000 J/kg°C). The oil enters the cooler at 130°C and leaves at 80°C, while the cold liquid enters at 30°C. Calculate the length of the tube required if heat transfer coefficient from oil to tube is 2000 W/m²°C and from surface to water is 4000 W/m²°C. Neglect the resistance of the tube wall. (Ans. 1.04 m)
Transcribed Image Text:Q2. An oil cooler consists of a straight tube of 20 mm O.D. and 16 mm I.D. enclosed within a pipe and concentric with it. The external pipe is well insulated. Hot oil flows through a tube at the rate of 0.05 kg/s (c, = 2000 J/kg°C) and cooling water flows in the annulus in opposite direction at the rate of 0.1 kg/s (c, = 4000 J/kg°C). The oil enters the cooler at 130°C and leaves at 80°C, while the cold liquid enters at 30°C. Calculate the length of the tube required if heat transfer coefficient from oil to tube is 2000 W/m²°C and from surface to water is 4000 W/m²°C. Neglect the resistance of the tube wall. (Ans. 1.04 m)
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