YUHONG GROUP - LOW FIN TUBE

Low finned tubes are generally machined to form ribs of a certain height, a certain pitch and a certain thickness on the outer surface of the light tube. Finned tubes are mostly used as heat exchange elements in condensers and evaporators of air conditioners, and low finned tubes are commonly used in condensers.

By the light tube and ‘attached’ to the fins on the composition of the structural parameters for the fin tube inner diameter, outer diameter, fin tube wall thickness, fin pitch, fin thickness and fin height and so on.

Low finned tube is mainly by the outer ribbing (ribbing coefficient of 2~3) to expand the heat transfer area, compared with the light tube, in the case of the same consumption of metal materials with a larger surface area. From the straight view belongs to the first enhanced heat transfer, but in essence is the heat transfer area increases at the same time brought about by the improvement of the heat transfer coefficient, ribs can make the heat transfer surface stripping the flow layer, so that the heat transfer surface perturbation to improve the effect of heat transfer, the second enhanced heat transfer. The main factors affecting the heat transfer of ribbed surfaces are fin height, fin thickness, fin spacing, and the thermal conductivity of the fin material. In addition, since one side of the heat transfer wall is extended into the finned surface, convective heat transfer on the smooth side, thermal conductivity of the base wall, etc. have some influence on its total heat transfer. The fin spacing dimension of low finned tube needs to be determined according to the surface tension of the liquid and the shear force on the liquid film generated by the flow.

Practical applications have proved that the low finned tube also has excellent anti-fouling properties, because the dirt is often formed along the edge of the crest of the parallel piece of dirt, with the temperature change in operation, the tube will expand and contract, this ‘accordion’ type of expansion and contraction, will prevent the generation of dirt. On a light tube, the dirt will form a cylinder on the tube wall and there is no natural mechanism to prevent the dirt from forming. Because of the lower fins, low-fin tubes are cleaned in exactly the same way and with the same difficulty as light tubes. In addition, the low finned tube is the use of ordinary light tube as a blank, after a simple rolling process and become, its mechanical strength and corrosion resistance is no less than the original light tube billet, can ensure that the heat exchanger can work reliably for a long time.