KL Type Finned Tube For Air Cooler

L/LL/KL Finned Tube Product Description:

- KL Finned Tube(Knurled Aluminum Tubing)

The KL type fin is commonly known as knurled L fin. This finned tube is basically identical to the Wrap-On fin and produced with a combination of Wrap-On and Embedded. The fins are manufactured from strip which is preformed into an accurately controlled L shape similar to the L type, rolled into a taper which causes it to curl. It is then continuously helically wound under tension onto the tube. The fin hugs the tube. The base tube is knurled by a rotating tool, then the foot of the fin is knurled into the knurling of the base tube providing a tight bond with increased thermal performance. Providing the correct fin strip is used the foot of one fin butts up against the next fin and there is no gap between the fins. The KL-type Fin Tube is applicable to high temperature up to 608 F degree (320C degree)

- L Finned Tube

L-Foot Finned Tubes are used for low-temperature application. L-Foot tension wound finned tubes consist of thin aluminium fin strip tightly wound helically around the tube circumference. A “foot” is first formed on one side of the fin strip (hence the name L-Foot). The strip is then wound tightly around the tube, with the foot bearing on the tube outer surface. The short horizontal limb of each L is in contact with the base tube surface to cover it completely. Tension in the fin strip as it is wrapped around the tube serves to seat the fin foot forcefully on the tube, and to hold the fin firmly in place. L-footed finned tubing offers maximum heat transfer at lower temperatures. The ends of the fins are stapled to prohibit the aluminium fin from unraveling, and loosing the contact between the fin foot and the tube. The L-type fin tube is applicable where temperatures do not exceed about 300 F degree (149C degree).

- LL Finned Tube

LL-Foot Fin – Overlapped L type fin is commonly known as double L or overlapped L fin, The fins are manufactured from strip in similar to the L type except that the foot is preformed into an accurately controlled stepped double L shape, rolled into a taper which causes it to curl. LL-Foot Fin – Overlapped L is then continuously helically wound under tension onto a tube. The fin hugs the tube with one fin overlapping the foot of the next fin with complete coverage of the base tube. This gives good corrosion protection to the tube. This type of tube is often used as an alternative to the more expensive extruded type fin in corrosive environments. The fins are secured at each end in a similar way as L fin. The LL-type fin tube is applicable where temperatures do not exceed about 350 F degree (177C degree).

L/LL/KL Finned Tube(Knurled Aluminum Tube) Manufacturing Process:

Applied Fin Tube is made with strip wrapped under tension around the base of the tube. Fins are welded to the base tube at the strip ends.

L/LL/KL Finned Tube(Aluminum Finned Tubes) Advantages:

Core tube extensively protected against corrosion by the fin foot, finning of very thin-walled tubes possible.

L/LL/KL Finned Tube Properties:

Atmospheric Corrosion Resistance: OK

Mechanical Resistance: Poor

Fin Contact: Interference Fit

Fin To Tube Bond :Moderate

Heat Transfer Efficiency :Moderate

L/LL/KL Finned Tube Applications：

. the petroleum, chemical and petrochemical process industries

. natural gas treatment

. the steel industry: blast furnace and converter systems

. power generation: steam turbine exhaust condensing

- contact condensing with cooling of circulating condensate

- fossil and nuclear power plants

. air conditioning (Freon, ammonia, propane)

. incineration of household refuse

. compressor coolers, etc.

L/LL/KL Finned Tube Specifications：