KL Type Finned Tube

KL type finned tube is an L-shaped winding tube. The surface of the tube is rolled first during manufacturing, and then rolled once on top of the L-foot simultaneously when winding the tube, so that part of the L-foot area is embedded in the surface of the tube. This increases the contact area between the fins and the tube surface by 50%, which means that the heat flux per unit area is also reduced by 50%, so that the heat stress at the root of the fins is very small, and even after several thousand thermal cycles, the contact area remains larger than the area of the L foot itself. The fins have a large contact area with the tube, fit tightly and securely, and can keep its performance unchanged for a long time. The bonding force between the fins and the steel tube and the ability to withstand cold and hot rapid changes are better than L-type and LL-type finned tubes. The national standard GB/T 15386-94 of air cooler stipulates that the maximum use temperature of KL-type finned tube is 250℃.