1. Introduction
A Shell and Tube Heat Exchangers is used to transfer heat from one fluid to another.
The two fluids will not mix together.
There will be a bundle of tubes located inside a shell. One of the fluids will travel through the tubes. The other fluid will travel outside of the tubes.
Heat is able to be efficiently exchanged in this manner. It is also able to withstand high temperatures and pressures.
Shell and tube heat exchangers are commonly found in many applications. They can be used in chemical, power, petroleum, HVAC and process industries.
Many variables will play a role in how efficient your shell and tube heat exchangers can be. Variables such as the tube used, the flow pattern, material used and temperature difference and heat transfer area.
Below we will go over the different components of a shell and tube heat exchangers.
2. What is a Shell and Tube Heat Exchanger?
A shell and tube heat exchangers is a heat transfer device that contains a set of tubes inside a cylindrical shell.
The two fluids being transferred will not come into contact with each other.
One fluid will pass through the tubes and the other will pass through the shell.
Heat will be transferred through the tubes due to a temperature difference.
Most of the time a shell and tube heat exchangers does not need the fluids to come in contact.
There can be multiple parts to a shell and tube heat exchanger.
- Shell
- Tube bundle
- Tube sheets
- Tubes
- Baffles
- Channel heads
- Nozzles
- Gaskets
- And more
Depending on what you are using the heat exchanger for there will be different variations of shell and tube heat exchangers.
You can see a shell and tube heat exchangers used for high pressure and there will be different components that are used to build it.
Industrial Heat Exchanger
3. How does a Shell and Tube Heat Exchanger work?
A shell and tube heat exchangers is fairly simple to understand.
First you have a fluid that you want to heat up or cool down.
That fluid will travel through one of the paths on the heat exchanger.
The fluid that will be used to heat up or cool down your fluid will travel through the other path.
If you are heating up your fluid it would travel through the tubes. And if you want to cool it down it would travel through the shell side.
Heat is then transferred to the tube.
From the tube to your fluid that you want to heat up or cool down.
Your two fluids will never come in contact with each other.
Flow Pattern
There are many ways that you can arrange the flow of your shell and tube heat exchangers.
Parallel flow
Both fluids will be traveling in the same direction.
This is a great way to flow your heat exchanger but may not give you the results you want thermally.
Counter flow
Both fluids will travel in opposite directions.
This is another great way to flow your heat exchanger.
Cross flow
Both fluids will travel towards each other.
This can be used depending on the application.
4. Components of a Shell and Tube Heat Exchanger
The components that make up your shell and tube heat exchangers will determine how efficient your heat exchanger can be.
4.1 Shell
The shell will house all of the components of your heat exchanger.
There will be a shell side that the fluid travels through.
Materials that can be used for shells can vary depending on the application.
4.2 Tubes
Tubes will be where most of your heat transfer takes place.
You can use many materials for tubes. Carbon steel, stainless steel, copper and even nickel can be used.
You can also use finned tubes to increase your heat transfer area on the outside of the tube.
4.3 Tube Sheets
Tube sheets will be used to hold your tubes in place.
Your tubes will be rolled into the tube sheet.
4.4 Baffles
Baffles can be used to force the shell side flow to travel through your tube bundle.
Baffles can also be used to support your tube bundle.
Another benefit of baffles is that they can create turbulence on the shell side.
Which can increase your heat transfer if used correctly.
4.5 Channel Heads
Channel heads will be used to feed your tube side flow into the tube bundle.
There are many types of channel heads that can be used on a shell and tube heat exchangers.
4.6 Nozzles
Nozzles will be used to connect your heat exchanger to the piping system that you are using it with.
There are many sizes and shapes that can be used for nozzles.
5. Types of Shell and Tube Heat Exchangers
As mentioned above there are many different types of shell and tube heat exchangers.
- Fixed Tube Sheet
- U Tube
- Floating Head
- Single Pass
- Multi Pass
- Finned Tube Shell and Tube
- Fixed Tube Sheet
The tube sheets will be welded to the shell of the heat exchanger.
This type of heat exchanger can be used in many different applications.
U Tube
As the name states the tubes will be U shaped.
The tube bundle can expand when using a u tube heat exchanger.
Floating Head
The floating head allows the tube bundle to expand away from the shell.
This allows for easier maintenance as well.
6. Shell and Tube Heat Exchanger Manufacturing
When it comes to manufacturing a shell and tube heat exchangers there are many steps involved.
Step 1
The first step would be to engineer the heat exchanger. There are many factors that will play a role in how your heat exchanger will be manufactured.
Step 2
After you know what kind of heat exchanger you need you can start manufacturing. The shell, tubes, tube sheets and other components can be manufactured.
Step 3
Your tubes will be cut to length and inserted into the tube sheet.
Step 4
Your tubes will be rolled or welded into the tube sheet. This can vary depending on the heat exchanger that you are manufacturing.
Step 5
After the tubes are inserted into the tube sheet you can insert the tube bundle into the shell.
Then you can add baffles, heads and any other components that are needed.
Step 6
All of the welded components will need to be inspected. You can inspect your welds with different methods.
Step 7
After all of the welding is complete you can pressure test your heat exchanger.
Step 8
Once pressure tested you can do a final inspection of your heat exchanger.
7. Benefits of Shell and Tube Heat Exchangers
There are many benefits to using a shell and tube heat exchanger.
Wide Temperature Range
Shell and tube heat exchangers can be used in a wide temperature range.
Large Heat Transfer Area
Because there are so many tubes in a heat exchanger you are able to increase your heat transfer area.
Can be Manufactured Many Ways
You can change the diameter of your tubes, length of your tubes, spacing of your tubes and much more.
Material Selection
You can use many different materials for your shell and tube heat exchangers. This allows for heat exchangers to be used in many different applications.
Long Lasting
With proper maintenance your shell and tube heat exchangers can last a long time.
Easy to Install
Shell and tube heat exchangers can be easily installed into any system.
8. Materials Used for Shell and Tube Heat Exchangers
There are many materials that can be used to manufacture a shell and tube heat exchangers.
Carbon Steel
Carbon steel is a very common material used for shells and tube side applications.
Stainless Steel
Stainless steel can be used on the shell side and tube side of a heat exchanger.
Copper & Copper Alloys
Copper can be used on the tube side of a heat exchanger.
Nickel
Nickel can be used for very corrosive applications.
Aluminum
Aluminum is a light weight material that can be used on shell and tube heat exchangers.
9. Applications of Shell and Tube Heat Exchangers
There are many applications that use shell and tube heat exchangers.
Chemical
Shell and tube heat exchangers can be used in the chemical industry to heat or cool products.
Petroleum
There are many shell and tube heat exchangers that are used in the petroleum industry.
Oil and Gas
Shell and tube heat exchangers can be used to heat or cool oil and gas.
Power Generation
Shell and tube heat exchangers can be used to heat or cool water.
HVAC
Shell and tube heat exchangers can be used to heat or cool water for HVAC systems.
Food and Beverage
Shell and tube heat exchangers can be used to heat or cool food and beverages.
Marine
Shell and tube heat exchangers can be used on boats to heat or cool water.
Heat Recovery
Shell and tube heat exchangers can be used to recover heat from a process.
10. Shell and Tube Heat Exchanger vs Plate Heat Exchanger
There are many similarities between a shell and tube heat exchanger and a plate heat exchanger.
Feature | Shell and Tube Heat Exchanger | Plate Heat Exchanger |
Main structure | Tubes inside shell | Corrugated plates |
Pressure capability | Often suitable for high-pressure service | Depends strongly on design |
Temperature range | Wide range | Wide range within design limits |
Maintenance | Tube cleaning is possible | Plates can often be opened |
Footprint | Usually larger | Often more compact |
Configuration | Highly customizable | Modular plate arrangement |
Typical applications | Heavy industrial processes | HVAC, food, chemical processes |
Can be manufactured to fit your needs Comes in many different sizes
Shell and tube heat exchangers and plate heat exchangers can both be used for many applications.
11. How to Choose a Shell and Tube Heat Exchanger
When choosing a shell and tube heat exchanger there are many factors that you need to consider.
Heat Duty
You need to know how much heat you are trying to transfer. This will determine how large of a heat exchanger you need.
Temperature
You need to know the temperatures that you will be using your heat exchanger at.
Pressure
You need to know the pressures that you will be using your heat exchanger at.
Fluid
There are many factors that come into play when choosing a shell and tube heat exchanger. The fluid that you are trying to heat or cool can determine the size and type of heat exchanger you need.
Corrosion
If the fluid that you are using is corrosive you will need to choose a material that can withstand the corrosion.
Fouling
If the fluid that you are using is prone to fouling you will need to take that into consideration when choosing a heat exchanger.
Maintenance
How often will you need to maintain your heat exchanger? If you need to maintain your heat exchanger often you may want to choose a heat exchanger that is easier to maintain.
Space
If you have limited space you may need to choose a smaller heat exchanger.
12. Shell and Tube Heat Exchanger Maintenance
It is important to maintain your shell and tube heat exchanger.
There are many things that you should monitor on your heat exchanger.
- Inlet and outlet temperatures
- Pressure drop
- Fluid flow rate
- Leakage
- Fouling
- Corrosion
- Tube condition
- Gasket condition
You should clean your heat exchanger on a regular basis.
There are many ways that you can clean your heat exchanger.
You can use mechanical, water or chemical to clean your heat exchanger.
13. Why Bangwin Thermal?
There are many factors that go into choosing the right shell and tube heat exchanger.
Bangwin Thermal is able to provide you with many different types of heat exchangers.
We specialize in heat exchangers and fin tubes.
Bangwin Thermal can provide you with heat exchangers that will fit your application.
We can provide you with different types of fin tubes as well.
If you need a fin tube heat exchanger we can provide you with that too.
Contact us today for more information.
High Frequency Welded Fin Tube
14. Frequently Asked Questions
l What is a shell and tube heat exchanger?
A shell and tube heat exchanger is a heat exchanger that uses tubes to transfer heat from one fluid to another.
l How does a shell and tube heat exchanger work?
A shell and tube heat exchanger works by transferring heat from one fluid to another through the tubes.
l What are the components of a shell and tube heat exchanger?
Some components of a shell and tube heat exchanger include tubes, shell, baffles, tube sheets and channel heads.
l What types of fluids can I use with a shell and tube heat exchanger?
You can use many different fluids with a shell and tube heat exchanger.
l Can a shell and tube heat exchanger be used at high pressures?
Yes, shell and tube heat exchangers can be used at high pressures.
l What is the difference between shell side and tube side?
The shell side is where the fluid travels around the tubes. The tube side is where the fluid travels through the tubes.
l Why do we use baffles on a shell and tube heat exchanger?
Baffles are used to create turbulence and support the tube bundle.
l How often should I clean my shell and tube heat exchanger?
You should clean your shell and tube heat exchanger when you notice a decrease in performance.
l Can I use finned tubes on a shell and tube heat exchanger?
Yes, you can use finned tubes on a shell and tube heat exchanger.
15. Conclusion
Shell and tube heat exchangers can be used for many applications.
By understanding the different components of a shell and tube heat exchanger you can choose the right heat exchanger for your application.
There are many benefits to using a shell and tube heat exchanger.
If you need a shell and tube heat exchanger contact us today.
Bangwin Thermal can provide you with the right heat exchanger for your application.
