Integral external fin tubes with various internal ridges are available in various metals like copper, carbon steel etc., all in Seamless Variety.
These low fin tubes with internal ridges are manufactured out of 15.875 mm & 19.05 mm OD with 19 FPI and 26 FPI external fins and internal ridges up to maximum length of 10 meters with any number of intermediate landings (plain portion) for baffle supports, in addition to side landings.
Low fin tubes with internal ridges was developed as a high-performance heat transfer tube for various freezing machines. By this, the inside fluid heat transfer capability is remarkably improved in comparison with the former smooth in-tube type tubes. By the effects multiplied mutually by the tube’s outside fins and inside spiral ridges a high coefficient for overall heat transfer has been obtained. These have contributed to the reduction in size of various freezing machines.
In comparison with conventional low-fin tubes, the inside heat transfer coefficient of low fin tubes with internal ridges was upgraded by more than two times, thus remarkably improving the overall heat transfer coefficient. It ensures improved performance irrespective of which side of the tube, inside or outside, the refrigerant flows. The pressure drop inside the tube is increased a little when compared to low-fin tubes.
