Aluminium Fin Copper Cooling Tube For Radiator

Extruded Fin Tube Properties:

"The extruded fin is formed from an outer aluminum tube with a large wall thickness (muff), which is aligned over an inner base tube. The two tubes are pushed through three arbors with rotating discs that literally squeeze or extrude the aluminum fins up and out of the muff material in a spiral shape in one operation. The resultant fin typically has a base or root thickness of .035"", average fin thickness .016"" and a tip of .009"", with an overall height of 16mm (5/8""). The root thickness serves to form an uninterrupted bond over the entire tube length.

Murphy disc technology now makes it possible to fin thinner muff thus offering significant material savings. Recommended standard muff wall is .176"" as opposed to industry practice of .183""-.210"" In addition, the same growth factor can be used for pitches from 8 - 11 FPI, allowing for standardization on one muff thickness and eliminating the need to stock multiple muff wall thicknesses. The same discs can be used to produce 5/8"" (15,9mm) or 1/2"" (12,7 mm) high fin.

Model B produces a 5/8"" high fin on tube sizes from 25mm to 1.5"" ( 38.1mm). The Model B Extruded Finning Machine is now capable of 7/16"" high integral copper fin at 7 to 10 FPI within the tube size range of the machine (25mm and 1.5""). Each machine is configured for the specific production requirements of the end user."

Extruded Aluminum Tubing Product Description:

Bimetallic Extruded Fin Tube, use base tube insert Aluminium tube, directly extruded the Aluminium into wanted fin specification. Fin and tube surface are tight touch thus improving the heat transfer efficiency. This also give considerable corrosion protection to the base tube.

Extruded Finned Tube Manufacturing Process:

The fins are rotary cold rolled from a smooth thick walled hollow blank tube slid over the core tube. Three multi spindle disc packs extrude the hollow blank tube into helical high fins.

During this process the inner diameter of the hollow blank tube is reduced and at the same time pressed on the core tube. This results in a mechanically solid joint.

Fin Material: Aluminium/Copper.

Core Tube Material: Carbon Steel/ Carbon

Alloy Steel/Stainless Steel/ Nickel Alloys/Copper/Copper Alloys/Titanium.

Extruded Fin Tubes Advantages:

100% fin-to-tube bond providing exceptional efficiency and longevity.

Excellent corrosion protection on the base tube.

Easy to clean with a high-pressure water jet without deforming the fins.

As the outer sleeve is continuous No galvanic corrosion between the tube and fins.

The bonding of the outer and inner tubes removes the risk of loss of contact with the aluminium due to thermal stress and fins are vibration resistant.

Higher heat transfer performance for the life of the unit.

Extruded Finned tubes are commonly used in applications with temperature up to 325 °c.

Aluminum Extruded Tubing Applications：

Primary extruded finned tubes are used in high temperature conditions and corrosive atmospheric conditions, such as operating temperatures less than 300°C or off-shore applications,heat pipes air to air heat exchangers for HVAC applications,air dehumidification in air treatment plants, energy recovery in air exhaust system. This kind of fin design is the least economical as compared to the other fin types, main reason due to the increased amount of aluminum used around 40% also increased labors during the manufacturing. However this increased cost can be compensated if using lower grade parent tube material.

Extruded Aluminum Tube Specifications：