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A heat transfer oil (specific heat -0.454 kcal/kg °C) leaving a hydraulic system at a rate of 10,000 kg/h at 85°C has to be cooled to 50°C before it can be circulated back to the system. It is desired to determine whether an existing 1-2 pass exchanger having an area of 15 m² would be suitable. Water is available at 30°C and must not be heated to above 38°C. An overall heat transfer coefficient (including the dirt factor) of 400 kcal/h m² °C can be attained in the exchanger. Water flows through the shell and the oil through the tubes. How will the heat transfer rate and the exit oil temperature be affected if the water flow rate is increased by 20%? The overall heat transfer coefficient U is assumed to remain unchanged.

A heat transfer oil (specific heat -0.454 kcal/kg °C) leaving a hydraulic system at a rate of 10,000 kg/h at 85°C has to be cooled to 50°C before it can be circulated back to the system. It is desired to determine whether an existing 1-2 pass exchanger having an area of 15 m² would be suitable. Water is available at 30°C and must not be heated to above 38°C. An overall heat transfer coefficient (including the dirt factor) of 400 kcal/h m² °C can be attained in the exchanger. Water flows through the shell and the oil through the tubes. How will the heat transfer rate and the exit oil temperature be affected if the water flow rate is increased by 20%? The overall heat transfer coefficient U is assumed to remain unchanged.

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 heat transfer oil (specific heat = 0.454 kcal/kg °C) leaving a hydraulic system at a rate of 10,000 kg/h at 85°C has to be cooled to 50°C before it can be circulated back to the system. It is desired to determine whether an existing 1-2 pass exchanger having an area of 15 m² would be suitable. Water is available at 30°C and must not be heated to above 38°C. An overall heat transfer coefficient (including the dirt factor) of 400 kcal/h m² °C can be attained in the exchanger. Water flows through the shell and the oil through the tubes. How will the heat transfer rate and the exit oil temperature be affected if the water flow rate is increased by 20%? The overall heat transfer coefficient U is assumed to remain unchanged.
Transcribed Image Text:A heat transfer oil (specific heat = 0.454 kcal/kg °C) leaving a hydraulic system at a rate of 10,000 kg/h at 85°C has to be cooled to 50°C before it can be circulated back to the system. It is desired to determine whether an existing 1-2 pass exchanger having an area of 15 m² would be suitable. Water is available at 30°C and must not be heated to above 38°C. An overall heat transfer coefficient (including the dirt factor) of 400 kcal/h m² °C can be attained in the exchanger. Water flows through the shell and the oil through the tubes. How will the heat transfer rate and the exit oil temperature be affected if the water flow rate is increased by 20%? The overall heat transfer coefficient U is assumed to remain unchanged.
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