As seen in the picture, the one above is a 12 diameter copper tube (bare tube), which is also commonly used in oil-water heat exchangers. The diameter can be customized according to the user, which is 8mm/9.5mm/10mm/12mm/14mm/16mm/25mm
The following are low finned tubes, commonly used in GLC, SL and other series. The outer surface is processed with fins to increase the heat transfer area, which can better enhance the heat transfer effect and improve the heat transfer efficiency by 2-2 compared to the ordinary bare tube above 5 times.