Confusion: outer tube heated vs. inner tube heated

In summary, in double-pipe heat exchangers, "outer tube heated" refers to the outer tube containing the colder fluid while the inner tube contains the hotter substance. This is the opposite of "inner tube heated" where the inner tube contains the colder fluid and the outer shell contains the hotter substance. "Heated" indicates that the fluid's temperature is increasing between the inlet and outlet. This is typically the case in most double pipe heat exchangers.
  • #1
maistral
240
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Hi, I'm rather confused with the wording in Perry's Chemical Engineers' Handbook regarding "outer tube heated" and "inner tube heated" in double-pipe heat exchangers. Obviously both are opposites of each other, so I'd like to ask using "outer tube heated" as reference.

When we say "outer tube heated", does it mean:

- The outer tube contains hot fluid, therefore, the inner tube contains the colder fluid; or:
- The outer fluid is literally being heated, therefore it is the cold fluid, and that the inner tube contains the hot fluid?
 
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  • #2
I understand it as the second option.
"Heated" means the flow is increasing its temperature between inlet and outlet.
Most of the double pipe heat exchangers that I have seen work that way:
The hotter substance flows through the inner tube, while the outer shell contains the colder fluid.
 

1. What is the difference between outer tube heated and inner tube heated?

Outer tube heated refers to a heating method where the heat source is located on the outer surface of the tube, while inner tube heated refers to a heating method where the heat source is located on the inner surface of the tube.

2. Which heating method is more effective?

The effectiveness of each heating method depends on the specific application and conditions. In general, outer tube heating is more efficient for heating fluids, while inner tube heating is more efficient for heating gases.

3. What are the advantages of outer tube heating?

Outer tube heating allows for more uniform and controlled heating of a fluid, as the heat source is in direct contact with the outer surface of the tube. It also minimizes the risk of overheating or burning the fluid.

4. How does inner tube heating work?

In inner tube heating, the heat source is located inside the tube, usually in the form of a heating element or coil. The heat is transferred to the fluid or gas through conduction, as the heat source comes into direct contact with the inner surface of the tube.

5. Are there any safety concerns with outer tube heating?

Outer tube heating can pose a safety risk if the heat source is not properly controlled or if the tube becomes too hot. It is important to monitor the temperature and ensure proper insulation to prevent any accidents or damage.

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