Finned tube heat exchangers [FTHE] have tubes with transverse fins to enhance the heat exchange rate by increasing the effective heat transfer area between the tubes and surrounding fluid, which is usually gasous such as air or process gases, while inside tubes may flow either gas, water, steam or oil.
The materials used are chosen according to the applications: carbon steel or stainless steel for pipes, and copper, carbon steel, galvanized steel, stainless steel or aluminum alloy for fins. The DAV Helix are best suited for air coolers or high temperature and heavy-duty applications. Compared to round-tube plate-fin heat exchangers, the FTHE is suitable to much higher temperatures: up to 350°C depending to selected materials.
Mechanically is very robust: each finned tube can slide absorbing different thermal dilatations without deformation of the structure and stress to weldings. An exclusive Dav Coil's manufacturing procedure creates coils by bending finned tubes instead of welding return bends, which reduces possible leakages and cracks.