Water at 0.8 kg/s enters the tubes of a two-shell-pass, four-tube- pass heat exchanger at 17°C and leaves at 37°C. It cools 0.5 kg/s of air entering the shell at 250°C with U = 432 W/m²K. Determine: (a) the exit air temperature; (b) the area of the heat exchanger; and (c) the exit temperature if, after some time, the tubes become fouled with Rf = 0.0005 m²K/W. [(c) Tairout = 140.5°C]
Water at 0.8 kg/s enters the tubes of a two-shell-pass, four-tube- pass heat exchanger at 17°C and leaves at 37°C. It cools 0.5 kg/s of air entering the shell at 250°C with U = 432 W/m²K. Determine: (a) the exit air temperature; (b) the area of the heat exchanger; and (c) the exit temperature if, after some time, the tubes become fouled with Rf = 0.0005 m²K/W. [(c) Tairout = 140.5°C]
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
Related questions
Concept explainers
Heat Exchangers
Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.
Heat Exchanger
The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.
Question
Problem 3.20 please
![LWO
case?
3.18 Suppose that the
shell-pass, four tube-pass exchanger with the hot fluid moving in
the tubes. (a) What would be the exit temperature in this
(b) What would be the area if we wanted the hot fluid to leave at
the same temperature as in the example? [(a) Tcout = 75.09°C]
3.19 Plot the maximum tolerable fouling resistance as a function of Unew
for a counterflow exchanger, with given inlet temperatures, if a 30%
reduction in U is the maximum that can be tolerated.
3.20 Water at 0.8 kg/s enters the tubes of a two-shell-pass, four-tube-
pass heat exchanger at 17°C and leaves at 37°C. It cools 0.5 kg/s
of air entering the shell at 250°C with U = 432 W/m²K. Determine:
(a) the exit air temperature; (b) the area of the heat exchanger; and
(c) the exit temperature if, after some time, the tubes become fouled
with Rf = 0.0005 m²K/W. [(c) Tairout = 140.5°C]
3.21 You must cool 78 kg/min of a 60%-by-mass mixture of glycerin in wa-
ter from 108°C to 50°C using cooling water available at 7°C. Design
a one-shell-pass, two-tube-pass heat exchanger if U
Which side should the water flow through? Explain any design
637 W/m²K.
decision you make and report the area, TH₂Oout, and any other
=
relevant features.
3.22 A mixture of 40%-by-weight glycerin, 60% water, enters a smooth
0.113 m I.D. tube at 30°C. The tube is kept at 50°C, and
TI boat transfer coefficient incid
3.25
3.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0faa0630-92f0-4653-b84e-0d22ebfc40eb%2F826f9788-3655-4d31-a686-cd38b3f84dab%2Flr765zk_processed.jpeg&w=3840&q=75)
Transcribed Image Text:LWO
case?
3.18 Suppose that the
shell-pass, four tube-pass exchanger with the hot fluid moving in
the tubes. (a) What would be the exit temperature in this
(b) What would be the area if we wanted the hot fluid to leave at
the same temperature as in the example? [(a) Tcout = 75.09°C]
3.19 Plot the maximum tolerable fouling resistance as a function of Unew
for a counterflow exchanger, with given inlet temperatures, if a 30%
reduction in U is the maximum that can be tolerated.
3.20 Water at 0.8 kg/s enters the tubes of a two-shell-pass, four-tube-
pass heat exchanger at 17°C and leaves at 37°C. It cools 0.5 kg/s
of air entering the shell at 250°C with U = 432 W/m²K. Determine:
(a) the exit air temperature; (b) the area of the heat exchanger; and
(c) the exit temperature if, after some time, the tubes become fouled
with Rf = 0.0005 m²K/W. [(c) Tairout = 140.5°C]
3.21 You must cool 78 kg/min of a 60%-by-mass mixture of glycerin in wa-
ter from 108°C to 50°C using cooling water available at 7°C. Design
a one-shell-pass, two-tube-pass heat exchanger if U
Which side should the water flow through? Explain any design
637 W/m²K.
decision you make and report the area, TH₂Oout, and any other
=
relevant features.
3.22 A mixture of 40%-by-weight glycerin, 60% water, enters a smooth
0.113 m I.D. tube at 30°C. The tube is kept at 50°C, and
TI boat transfer coefficient incid
3.25
3.
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 5 steps
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY