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Reasonable fin shape and size can increase heat transfer area while reducing fluid flow resistance, thereby improving heat transfer efficiency.

Finned tubes increase the heat transfer area by adding fins outside the tube, thereby improving the heat transfer efficiency of the heat exchanger.

The heat transfer coefficient range of finned tubes is usually between a film coefficient of 300 w/m2. k and 80 w/m2. k.

The manufacturing methods of finned tubes generally include mechanical flanging, mechanical wing pressing, extrusion method, etc.

The metal thin strip is pressed into an L-shape on the winding machine (the short side length is equal to the fin spacing

The finned tube has the concept of "fin to fin ratio", which is the ratio of the total surface area of the fins to the original bare tube area