Large double pipe heat exchanger - how to connect in series?

Another option to consider is a parallel arrangement, where the hairpins are placed side by side. This arrangement is commonly used in the literature, but both options have their advantages and it ultimately depends on the specific design and practicality considerations.
  • #1
cabellos2
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I have designed a heat exchanger of the double pipe hairpin variety and with 6" and 8" concentric tubes. The overall length is 90m therefore I need to connect nine 5m hairpins (10m total length) together but thinking about the practicality of it is it possible to connect this number in series and how should/could it be arranged. In series do the hairpins (U-tubes) have to be placed one on top of the other?

Iv looked at the possibility of a parralell stream - as from the literature the general consensus is that in parralell the hairpins are side by side and in series on top of each other.

Thanks for the advice
 
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  • #2
.It is possible to connect nine 5m hairpins in series provided that their arrangement is done correctly. The hairpins must be arranged in a vertical orientation, with the tubes stacked one on top of the other. It is also important to ensure that each tube is properly connected with the adjacent tubes to ensure adequate flow and heat transfer. Additionally, the tubes should be insulated to prevent heat loss.
 

1. How does a large double pipe heat exchanger work?

A large double pipe heat exchanger works by transferring heat from one fluid to another through a series of pipes. The two fluids flow in opposite directions, with one fluid passing through the inner pipe and the other passing through the outer pipe. Heat is transferred through the walls of the pipes, allowing the two fluids to exchange thermal energy without physically mixing together.

2. What are the benefits of connecting heat exchangers in series?

Connecting heat exchangers in series allows for a larger temperature difference between the two fluids, resulting in a more efficient heat transfer. It also allows for a higher overall heat transfer rate, as the fluids continue to exchange heat in each subsequent heat exchanger.

3. How do you properly connect heat exchangers in series?

To connect heat exchangers in series, the outlet of the first heat exchanger must be connected to the inlet of the second heat exchanger. This continues for each additional heat exchanger in the series. It is important to ensure that the direction of fluid flow is maintained and that the connections are secure to prevent any leaks.

4. Can different types of heat exchangers be connected in series?

Yes, it is possible to connect different types of heat exchangers in series, as long as they are designed to handle the same type of fluid and the same temperature and pressure conditions. However, it is important to consider the compatibility and efficiency of the heat exchangers when connecting them in series.

5. Are there any limitations to connecting heat exchangers in series?

There are a few limitations to connecting heat exchangers in series. One limitation is that the total pressure drop across the series of heat exchangers will be higher than that of a single heat exchanger. Additionally, connecting too many heat exchangers in series can lead to a decrease in efficiency, as the overall temperature difference between the two fluids becomes smaller. It is important to carefully consider the design and number of heat exchangers in a series to ensure optimal performance.

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