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LL type finned tube or double L fin tube

What is LL type finned tube or double L fin tube?

LL type finned tube or double L fin tube fabricate based on the L type fin tube, the root of the fin completely covers the outer surface of the base tube, which can strengthen the contact surface and increase the heat transfer effect.

The trapezoidal section formed by the rolling of L-shaped finned tubes is consistent with the distribution of heat flow density. The tubes are closely combined and have high thermal efficiency, eliminating the contact thermal resistance of the tandem finned tubes caused by the inability to eliminate the tube gap.

Working temperature of LL type finned tube or double L fin tube: 

LL type finned tubes operation temperature is a little higher than for L fin tube. Working temperature is max. 230 ℃

LL type finned tube|double L fin tube

LL type finned tube|double L fin tube

Characteristics of LL type finned tube or double L fin tube:

Winding process is adopted, with high production efficiency, uniform fin spacing, good heat transfer, high fin ratio, and the base tube can be protected from air erosion.

LL finned tube or double L fin tube application: 

Double “L” fin tube is used on applications requiring additional corrosion protection to the surface of the base tube. It is produced similar to “L” fin but has a wider fin base which is overlapped during the winding process. LL finned tube or double L fin tube mainly used in air coolers in petrochemical, power, paper making, tobacco, building heating and other industries, air heaters, and air heaters in plant protein powder, starch and other spray drying systems in the food industry.

LL type finned tube or double L fin tube material:

LL type finned tube or double L fin tube is made of steel tube or stainless steel tube, and the fin is made of aluminum. The working temperature can reach 180 degrees. It has the characteristics of tight contact between tubes, stable distance between fins, no wrinkles, no dust accumulation, good vibration resistance, and protection of tubes from air erosion.

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