extruded finned tube  is a heat exchange element with fins made on the outer surface of the optical tube by mechanical machining or thermal machining. These fins are usually made of metal materials,

 such as copper, aluminum or steel, which can improve the heat transfer efficiency of the heat exchanger. Extruded finned tubes are commonly used in air-water heat exchangers, cooling towers, condensers, 

evaporators, and a variety of other industrial and commercial heat transfer equipment.

The working principle of the extruded finned tube is to increase the heat transfer efficiency by increasing the heat transfer area. 

The shape and size of the fins can be designed according to the needs of the application to achieve the best heat transfer effect. In addition,

 the fins can also improve the flow state of the fluid, for example, through the perturbation of the fins, the turbulence of the fluid can be enhanced, thereby improving the heat transfer performance.

Advantages of extruded finned tubes include:

Efficient heat transfer: the fin increases the heat transfer area and improves the heat transfer efficiency.

Compact structure: Extruded finned tube heat exchangers with the same heat transfer capacity are usually smaller than other types of heat exchangers.

Easy to clean and maintain: The space between the fins provides a good cleaning channel for easy removal of dirt and sediment.

Customizability: The shape and size of the fins can be designed and adjusted according to the specific application.

However, extruded finned tubes have their limitations. For example, due to the presence of fins, the flow resistance of the fluid will be increased and higher pumping power may be required. 

In addition, fins can increase the cost of heat exchangers and in some cases can be a source of stress concentration and corrosion. Therefore, when selecting the extruded finned tube, 

it is necessary to consider its advantages and disadvantages and specific application scenarios.