A cylindrical heat exchanger is used to warm up a stream of 0.15 Kg s-' cold air from a temperature of 200 K to 300 K, after which it is released into the atmosphere. The air enters and leaves the heat exchanger through a pipe with a diameter of 5 cm. The heat exchanger is of a "Shell and tube design" as shown below and the air flows through the inside of the tubes. The internal diameter of the shell is 30 cm. There are 40 tubes each with a diameter of 1 cm in the heat exchange. It can be assumed that there is no friction in the system. The only change in the gas density occur inside the tubes, elsewhere, the gas can be considered incompressible. The density of the air at 300 K is 1.23 Kg m-3. The viscosity of air at 200 K is 1.1 x 10-5 kg m-1 s-l; at 300 K it is 1.8 x10-5 kg m-' s-1. Water of enters the heat exchanger at 350 K and leaves at 320 K. a) Suggest suitable material for the tubes and shell for water to be sea water or feed water. b) Comment of the effect of fouling on the performance of the heat exchanger considered.

A cylindrical heat exchanger is used to warm up a stream of 0.15 Kg s-' cold air from a temperature of 200 K to 300 K, after which it is released into the atmosphere. The air enters and leaves the heat exchanger through a pipe with a diameter of 5 cm. The heat exchanger is of a "Shell and tube design" as shown below and the air flows through the inside of the tubes. The internal diameter of the shell is 30 cm. There are 40 tubes each with a diameter of 1 cm in the heat exchange. It can be assumed that there is no friction in the system. The only change in the gas density occur inside the tubes, elsewhere, the gas can be considered incompressible. The density of the air at 300 K is 1.23 Kg m-3. The viscosity of air at 200 K is 1.1 x 10-5 kg m-1 s-l; at 300 K it is 1.8 x10-5 kg m-' s-1. Water of enters the heat exchanger at 350 K and leaves at 320 K. a) Suggest suitable material for the tubes and shell for water to be sea water or feed water. b) Comment of the effect of fouling on the performance of the heat exchanger considered.

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

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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

A cylindrical heat exchanger is used to warm up a stream of 0.15 Kg s-l cold air from a temperature
of 200 K to 300 K, after which it is released into the atmosphere. The air enters and leaves the
heat exchanger through a pipe with a diameter of 5 cm. The heat exchanger is of a "Shell and tube
design" as shown below and the air flows through the inside of the tubes. The internal diameter of
the shell is 30 cm. There are 40 tubes each with a diameter of 1 cm in the heat exchange.
It can be assumed that there is no friction in the system. The only change in the gas density occur
inside the tubes, elsewhere, the gas can be considered incompressible. The density of the air at 300
K is 1.23 Kg m-3. The viscosity of air at 200 K is 1.1 x 10-5 kg m-l s-l; at 300 K it is 1.8 x10-5 kg
m-! s-l. Water of enters the heat exchanger at 350 K and leaves at 320 K.
a) Suggest suitable material for the tubes and shell for water to be sea water or feed water.
b) Comment of the effect of fouling on the performance of the heat exchanger considered.
N. B. Justify your answers with well written statements, detailed working out and reasonable
assumptions.
Good Luck
Cold air
B
[C
Warm air
A
E
F
Heat exchanger for warming up air.

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