What Is A Finned Tube

• Finned Tube: is a device used for heat exchange, usually consisting of one or more tubes arranged in parallel with fins fixed to the tubes. It is designed to increase the surface area of the tube, thereby improving heat transfer efficiency. It is commonly used in air conditioning, refrigeration equipment, boilers, turbines and other systems.
• Application

1. Increase the heat transfer areaThe design of finned tube can effectively increase the heat transfer area and thus improve the heat exchange efficiency.
2. Improve heat transfer efficiencyThe structure of finned tube can increase the heat transfer coefficient and improve the heat transfer efficiency, so that the heat exchanger has better heat transfer performance.
3. Reduce fluid resistance finned tube can reduce the resistance of the fluid in the pipeline, reduce the energy consumption of the system, improve the operating efficiency of the system.
4. Reduce the volume of the equipment Finned tube has high heat transfer efficiency, so it can reduce the volume of the equipment under the same heat transfer effect, saving space.

• Principles of operation

1. Heat transfer of the fluid flowing inside the finned tube (generally liquid or gas) through the finned tube wall and the medium outside the wall (generally air or liquid) for heat transfer. Finned tube fin structure can increase the contact area between the wall and the medium to improve heat transfer efficiency.
2. convection heat transfer between the medium and the finned tube wall heat transfer is mainly achieved through convection heat transfer. The medium forms a convection layer on the surface of the finned tube, and the heat is transferred to the medium through convection heat transfer.
3. forced convection finned tube flow of fluid through the finned tube wall, will be the fin resistance, the formation of strong convection phenomenon, accelerate the heat transfer rate.
4. Improvement of heat transfer efficiency Because the finned structure of finned tube can increase the surface area of heat transfer and improve the heat transfer efficiency, finned tube is widely used in heat exchangers for heating, cooling and temperature regulation and other processes.

• Different types and features

1. Inlaid finned tube fins and tube wall are connected by inlaid way, usually fixed by machining or welding, with firm connection and good heat dissipation. 
2. Extruded finned tube fins are fixed on the tube wall by extruding, which has tight connection and good heat dissipation effect, but the manufacturing cost is higher.
3. Winding type finned tube fins are fixed on the wall of the tube by winding method, with firm connection and good heat dissipation effect, suitable for large diameter pipes.
4. String finned tube fins are connected in series on the pipe, with general heat dissipation effect, suitable for small diameter pipes.
5. U-type finned tube fins are U-shaped connected to the pipe, good heat dissipation, suitable for high temperature and high pressure conditions of heat dissipation.
6. Welded type finned tube fins are connected to the pipeline by welding, with firm connection and good heat dissipation effect, but the manufacturing cost is higher.