Problem No.2 A cross-flow heat exchanger consists of 40 thin-walled tubes of 1-cm diameter located in a duct of Im xlm cross-scction as shown in the figure. air 160°C 12 m/s I atm Oil 280 K 3 m/s Cold oil enters the tubes at 340 K with an average velocity of 3 m/s, while hot air enters the channel at 160°C and 101.325 kPa at an average velocity of 12 m/s. Determine a. the convection heat transfer coefficients inside the tube b. the convection heat transfer coefficients outside the tube c. the overall heat transfer coefficient. d. the effectiveness of the heat exchanger. e. the mass flow rate of air f. the rate of heat transfer from the air to the oil.
Problem No.2 A cross-flow heat exchanger consists of 40 thin-walled tubes of 1-cm diameter located in a duct of Im xlm cross-scction as shown in the figure. air 160°C 12 m/s I atm Oil 280 K 3 m/s Cold oil enters the tubes at 340 K with an average velocity of 3 m/s, while hot air enters the channel at 160°C and 101.325 kPa at an average velocity of 12 m/s. Determine a. the convection heat transfer coefficients inside the tube b. the convection heat transfer coefficients outside the tube c. the overall heat transfer coefficient. d. the effectiveness of the heat exchanger. e. the mass flow rate of air f. the rate of heat transfer from the air to the oil.
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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Transcribed Image Text:Problem No.2
A cross-flow heat exchanger
consists of 40 thin-walled tubes of
1-cm diameter located in a duct of
Im xlm cross-section as shown in
the figure.
Minit
Majm
Coile
Dep
air
160°C
12 m/s
I atm
Oil
280 K
3 m/s
Cold oil enters the tubes at 340 K with an average velocity of 3 m/s, while hot air
enters the channel at 160°C and 101.325 kPa at an average velocity of 12 m/s.
Determine
a. the convection heat transfer coefficients inside the tube
b. the convection heat transfer coefficients outside the tube
c. the overall heat transfer coefficient.
d. the effectiveness of the heat exchanger.
e. the mass flow rate of air
f. the rate of heat transfer from the air to the oil.
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