Finned tubes are used in heat exchangers where the heat transfer coefficient is much higher on one side of the heat exchanger than the other. For general industry, these applications typically involve the heating or cooling of air or other gases. The application of fins increases the heat transfer surface area in contact with the fluid with lower heat transfer coefficient.
The main four type of fins are: plain, which refer to simple straight-finned triangular or rectangular designs; herringbone, where the fins are placed sideways to provide a zig-zag path; and serrated and perforated which refer to cuts and perforations in the fins to augment flow distribution and improve heat transfer.
Advantages of Finned Tube Heat Exchanger
- High heat transfer efficiency especially in gas treatment
- Larger heat transfer area
- Approximately 5 times lighter in weight than that of shell and tube heat exchanger.
- Able to withstand high pressure
Application Finned Tube Heat Exchanger
- The cost of Fin heat exchangers is generally higher than conventional heat exchangers due to a higher level of detail required during manufacture.
- However, these costs can often be outweighed by the cost saving produced by the added heat transfer.
- Fin heat exchangers are generally applied in industries where the fluids have little chances of fouling.
- The delicate design as well as the thin channels in the fin heat exchanger make cleaning difficult or impossible.