3.34 A flow rate of 1.4 kg/s of water enters the tubes of a two-shell-pass, four-tube-pass heat exchanger at 7°C. A flow rate of 0.6 kg/s of liquid ammonia at 100°C is to be cooled to 30°C on the shell side; U 573 W/m²K. (a) How large must the heat exchanger be? (b) How large must it be if, after some months, a fouling factor of 0.0015 m²K/W is expected to build up in the tubes but we still want to deliver ammonia at 30°C? (c) If we make it large enough to accommodate fouling, to what temperature will it cool the ammonia when it is new? (d) At what temperature does water leave the new, enlarged exchanger? [(d) TH₂0 = 49.9°C.]
3.34 A flow rate of 1.4 kg/s of water enters the tubes of a two-shell-pass, four-tube-pass heat exchanger at 7°C. A flow rate of 0.6 kg/s of liquid ammonia at 100°C is to be cooled to 30°C on the shell side; U 573 W/m²K. (a) How large must the heat exchanger be? (b) How large must it be if, after some months, a fouling factor of 0.0015 m²K/W is expected to build up in the tubes but we still want to deliver ammonia at 30°C? (c) If we make it large enough to accommodate fouling, to what temperature will it cool the ammonia when it is new? (d) At what temperature does water leave the new, enlarged exchanger? [(d) TH₂0 = 49.9°C.]
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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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
![3.34 A flow rate of 1.4 kg/s of water enters the tubes of a two-shell-pass,
four-tube-pass heat exchanger at 7°C. A flow rate of 0.6 kg/s of
liquid ammonia at 100°C is to be cooled to 30°C on the shell side;
U = 573 W/m²K. (a) How large must the heat exchanger be? (b)
How large must it be if, after some months, a fouling factor of
0.0015 m²K/W is expected to build up in the tubes but we still
want to deliver ammonia at 30°C? (c) If we make it large enough to
accommodate fouling, to what temperature will it cool the ammonia
when it is new? (d) At what temperature does water leave the new,
enlarged exchanger? [(d) TH₂0 = 49.9°C.]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0faa0630-92f0-4653-b84e-0d22ebfc40eb%2F713b479e-0bad-4bb6-8df2-cb15164d4fca%2Fb14os2q_processed.jpeg&w=3840&q=75)
Transcribed Image Text:3.34 A flow rate of 1.4 kg/s of water enters the tubes of a two-shell-pass,
four-tube-pass heat exchanger at 7°C. A flow rate of 0.6 kg/s of
liquid ammonia at 100°C is to be cooled to 30°C on the shell side;
U = 573 W/m²K. (a) How large must the heat exchanger be? (b)
How large must it be if, after some months, a fouling factor of
0.0015 m²K/W is expected to build up in the tubes but we still
want to deliver ammonia at 30°C? (c) If we make it large enough to
accommodate fouling, to what temperature will it cool the ammonia
when it is new? (d) At what temperature does water leave the new,
enlarged exchanger? [(d) TH₂0 = 49.9°C.]
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