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The role and selection principle of finned tube in finned tube heat exchanger
- May 12, 2018 -

In the industrial field, the application of heat exchanger equipment is more and more extensive. Since the heat transfer coefficient of the fluids on both sides of the heat transfer tends to be unbalanced, the fins are generally installed on the side where the heat transfer coefficient is small. This type of heat exchanger is called a finned tube heat exchanger. Why do you want to add finned tubes? What is the role of the finned tube in the operation of the finned tube heat exchanger?

 

First of all, let's briefly describe what is a fin tube. In fact, finned tubes are also called fin tubes or fin tubes. As the name implies, the finned tube is processed on the surface of the original tube (regardless of the outer surface or the inner surface) with many fins, so that the original surface is expanded to form a unique heat transfer element. So why do finned tube heat exchangers use finned tubes? How can fins be processed on the original surface?

 

We know that, in fact, the structure of this finned tube heat exchanger is not significantly different from that of an ordinary shell-and-tube heat exchanger. Instead, it uses a finned tube instead of a light tube as the heat transfer surface. This makes its structure more compact, the heat transfer area increases, and heat transfer can be enhanced. Under normal circumstances, in practical applications, if the heat transfer coefficient on both sides of the tube is greatly different, then the fins should be installed on the side where the heat transfer coefficient is small.

 

At the same time, it should also be noted that when designing the structure of the finned tube heat exchanger, it is advisable to place the small side of the heat transfer coefficient outside the tube in order to facilitate the installation of fins. If the heat transfer coefficient on both sides of the tube is small, in order to enhance heat transfer, fins should be added on both sides simultaneously. If there are difficulties in the structure, no fins may be added on both sides. In this case, if fins are only added on one side, there will be no significant effect on the increase in heat transfer.

 

In fact, in different finned tube heat exchanger equipment, the arrangement of the finned tubes is also different. It is important to know that in a tube bundle, the choice of the fin tube arrangement of the fin tube heat exchanger is crucial. There are two types of arrangement: crossbar and row. The so-called row of rows refers to the arrangement of tubes crossing in the direction of gas flow, and the row of rows refers to the arrangement of tubes in the direction of gas flow.

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