Finned tubes are made of circular and oval cross-sections – in both cases the gas-facing surface is increased by a factor of 9-10.
Finned tubes are widely used in the manufacture of heat exchange equipment. It is economically feasible to use ribbed and stud-shaped tube elements in such heat exchangers in which the conditions of heat exchange with one heat carrier are significantly worse than those with the other.
In these cases, the low heat transfer coefficient on the gas side can be compensated for by increasing the tube surface on the fin or stud side, thereby enhancing the heat transfer process and reducing weight, size and heat exchange equipment costs, as well as operating costs.
Finned tubes (double finned) (GOST 13667 – 68) – type L with outer tube diameters of 38, 40 and 42 mm, type B – also with outer diameter of 50 mm.
Finned tubes differ from ribbed tubes only in the shape of the air side fins.
Finned tubes are rolled from aluminium, copper and their alloys, bimetal, carbon steel, alloy steel and high alloy steel as well as special alloys.
It is not allowed to install finned tubes with broken ribs exceeding 5% of the total number of ribs on the tube. When the finned tube is installed in a vertical plane, the longitudinal ribs are located on the finned tube.
It is economically feasible to use ribbed and stud-shaped tube elements in such heat exchangers in which the conditions of heat exchange with one heat carrier are significantly worse than those with the other.
In these cases, by increasing the surface of the tube on the fin or stud side, the low heat transfer coefficient on the gas side can be compensated, thereby enhancing the heat transfer process and reducing the weight, size and cost of heat exchange equipment, as well as operating costs.
Finned tubes are usually installed as a bundle of tubes in enclosures, heaters or batteries in heating equipment.
In addition to heaters, finned tubes are more widely used in the design of heat exchangers, where heat is exchanged between liquid and gas flowing along the outer surface of the tubes.
Finned tubes are widely used in the manufacture of heat exchange equipment. Most of the problems associated with media heating, cooling and condensation are successfully resolved when using finned tube elements.