Chemical Engineering - Heat Transfer - Discussion
Discussion Forum : Heat Transfer - Section 1 (Q.No. 35)
35.
Air is to be heated by condensing steam. Two heat exchangers are available (i) a shell and tube heat exchanger and (ii) a finned tube heat exchanger. Tube side heat transfer area are equal in both the cases. The recommended arrangement is
Discussion:
12 comments Page 1 of 2.
Fareed khan said:
7 years ago
If steam is passing through shell it will cause heat loss from shell to atmosphere. That's is loss in industry.
So always try to pass high temp fluids through the tube and low temperature outside the tube.
So always try to pass high temp fluids through the tube and low temperature outside the tube.
(1)
Saurabh said:
1 decade ago
Why finned tube? Why not shell and tube heat exchange? Please explain the difference.
Bajwa said:
1 decade ago
A finned tube heat ex-changer usually gives 5 to 8 time more heat transfer as compare to other types, we will use air outside the tube bundles and stream inside the tubes because air may also contains some some impurities (solid particles) and it can damaged the tubes in form of clogging, fouling etc.
Faraz Ahmed said:
10 years ago
Fins may also be fouled, and it is rather difficult to clean fins than tubes, so why we can't prefer flow of air inside the tube ?
Saiyam patel said:
9 years ago
Air may also contains some some impurities (solid particles) and it can damaged shell in form of clogging, fouling etc so it costly to replace hole shell. So I think that air is pass through tube side.
Shriman Dave said:
8 years ago
But with steam in tubes, it may lead to hammering as well as fouling, also with steam in shell, we could get better htc so why steam in tubes?
Sukhdeep said:
8 years ago
Heat exchanger here is plate type heat exchanger and no case of clogging.
Parth said:
7 years ago
@Shriman Dave.
The temp of the steam is greater than air and generally which has greater temp is taken into the tube side because it can cause to harm the costly shell.
The temp of the steam is greater than air and generally which has greater temp is taken into the tube side because it can cause to harm the costly shell.
Trushal said:
6 years ago
For gas-liquid system, always fin-type H E is used.
Kiran said:
5 years ago
Steam can cause corrosion. That's why steam is in tubes.
The heat transfer coefficient of air is low. That is air is taken in shell side with finned. Fins will increase the heat transfer rate.
The heat transfer coefficient of air is low. That is air is taken in shell side with finned. Fins will increase the heat transfer rate.
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