Aluminum Finned Tube Suppliers in China
Aluminum Finned Tube for Heat Exchanger
Aluminum helical fin tubes are high-performance heat transfer components used primarily in air-cooled heat exchangers, radiators, and boilers. By wrapping an aluminum fin around a base tube in a spiral (helical) pattern, the surface area is significantly increased, which compensates for the low heat transfer coefficient of air.
Datang is your specialist in the field of aluminum finned tubes. These finned tubes have various applications and are used in heat exchangers, for example. Use the finned tube when the heat transfer coefficient on the outside of a tube is less than the same coefficient on the inside of it. The fins of a finned tube stimulate heat transfer, which enhances the effect of the heat exchanger.
Common Types of Helical Fin Tubes
Aluminum finned tubes are offered in different variants. It is mainly important to look at the thermodynamic properties that the outside of a tube has. This determines to what extent additional surface is needed. You can also choose from a high or low finned on the aluminum finned tubes. A low finned tube is often chosen for oil-based coolers. Whereas in systems with air on the outside, a high finned tube is more likely to be chosen. The method of attaching the aluminum fin to the base tube determines the tube’s thermal efficiency, temperature limits, and atmospheric corrosion resistance. “L” Fin (Tension Wound),”LL” Fin (Double L),”KL” Fin (Knurled L),”G” Fin (Embedded),Extruded Fin (Bimetallic).
Materials and Specifications
While the fins are typically Aluminum (1060/1100) due to its high thermal conductivity and low weight, the base tube material varies depending on the fluid being transported:
| Component | Common Materials |
| Base Tube | Carbon Steel (A179, A106), Stainless Steel (304L, 316L), Copper, Cu-Ni |
| Fin Material | Aluminum 1050, 1060, 1100, 6063 |
| Fin Height | Typically 6mm to 16mm |
| Fin Pitch | Typically 7 to 12 fins per inch (FPI) |
Aluminum Helical Fin Tube Applications
- HVAC Systems: Used in air conditioners and heat pumps for both indoor and outdoor units due to their high performance-to-weight ratio.
- Industrial Waste Heat Recovery: extensively used in power plants, metallurgy, and cement industries to recover heat from flue gases.
- Oil Cooling: Used in oil coolers where they demonstrate better comprehensive performance (higher heat exchange, lower pressure drop) compared to some other baffle designs.
- Boilers: Specifically in economizers and air preheaters.
Quality Control for Aluminum Helical Fin Tube
The quality of the Aluminium finned tube is assured by hydrostatic or pneumatic testing, eddy current testing and tensile testing to verify the mechanical bond between the inner tube and the outer fins.
Datang Fin Tubes Delivery condition:
Tube ends are square cut, free burrs, internally dried and air blown clean, externally coated with Anti-rust at both ends of copper finned tube.
Application fields of aluminum fin tubes:
Aluminum finned tube is widely used in water-cooled air heat exchangers and high-temperature water radiators in the petroleum and chemical industries.
Extruded Composite Aluminum Fin Tube(Bimetallic)
Extruded composite aluminum fin tube(Bimetallic) is a single-metal composite finned tube rolled from an aluminum tube, with no contact thermal resistance, high strength, heat resistance and mechanical vibration, good thermal expansion performance, and a considerable extended heat exchange surface.
An aluminum outer tube is placed over a base inner tube (e.g., carbon steel, stainless steel, or copper). The assembly is then cold-rolled through a die to “grow” the fins directly out of the aluminum sleeve.
Max Operating Temp: ~285°C.
Best For: Maximum atmospheric corrosion resistance and excellent mechanical strength.
"G" Fin (Embedded) Finned Tube
G type finned tube is that the fin strip is tension wound and placed in the groove cut into the tube with appr, 0.4mm groove depth, then the bottom of the fin is guided into the groove and backfilled with base tube Firmly, finally lock the fins in place by rolling the grooves enclosed in the bottom of the fins.
Max Operating Temp: ~400°C.
Best For: High-temperature cycles and high-vibration environments.
LL Fin (Double L) Finned Tube
LL type finned tube is Similar to the L-fin, but the feet overlap to completely cover the base tube. This offers excellent corrosion resistance for the base metal (often carbon steel).It is a finned tube in which the fin feet are preformed into an LL shape (overlapping LLs) and a strip of aluminum fins is applied to the base tube under tension. However, the feet are pre-formed so that one foot overlaps the other, increasing the base tube protection and thermal contact area of the finned tube. LL Type Finned Tube is usually used in steam coils, air pre-heaters.
Max Operating Temp: ~180°C.
KL Fin (Knurled L) Finned Tube
KL type fin tube is a kind of knurled finned tube. Before winding the fins, knurl patterns on the base tube, the foot of the L-fin is then pressed into these knurls, creating a mechanical bond that improves heat transfer and resists vibration.
Max Operating Temp: ~250°C.
Max Working Pressure:3.2MPa.
Best For: Applications requiring better thermal performance than standard L-fins.
L Footed(Tension Wound) Finned Tube
L Type Finned Tube is a finned tube made of aluminum fin tape folded into an L-shaped spiral under tension and wrapped tightly around the outer surface of the base tube.The “foot” of the L provides some surface protection to the tube.
The tension in the fin strips of the L Type Finned Tube wraps around the tube, causing the fin feet to press forcefully against the tube, holding the fins firmly in place. L Type Finned Tube is usually used in air coolers in petrochemical, power, paper, tobacco, building heating and other industries as well as heat exchangers in power plants (electricity, nuclear, thermal and geothermal power plants), the maximum operating temperature can reach 150°C.
Integrally Rolled Single Aluminum Finned Tube
The integrally rolled single aluminum finned tube is directly cold-rolled from an aluminum tube to form fins, creating a seamless connection with no thermal contact resistance. It boasts excellent heat transfer performance, strength, and resistance to impact/vibration, making it an ideal choice for air coolers, chillers, and other industrial applications requiring high-efficiency heat exchange.
Advantages of Aluminum Fin Tubes
1. Aluminum finned tubes have the characteristics of efficient heat transfer. The thermal efficiency of boilers using aluminum finned tubes can be increased by 5% to 10%, which means huge energy savings for large industrial boilers.
2. The design of aluminum finned tubes makes them lighter, which not only reduces energy consumption during transportation and installation, but also reduces costs.
3. Aluminum finned tubes have good corrosion resistance, can cope with wet and dry working conditions, are not easy to rust, and have good corrosion resistance. This characteristic enables aluminum finned tubes to maintain stable and efficient operation in various environments.
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Aluminium Finned Tube FAQs
A: Aluminium L type fin tube production line 12.
A: We can provide aluminium fin tube samples for free.
A: After you confirm aluminium finned tube sample details, the samples will be ready for delivery in 3-7days,and will be sent to you via express and arrive in 3-5days.
A: Aluminium fin tube can be customized, we can make the new thermoforming or extruding mode based on your drawings and we can sign a confidentiality agreement about your patented product, pls contact us for any further information.
A: Always a pre-production sample,before mass production;always final inspection before shipment.
Inspection & Guarantee Certificate is supplied with shipment, and the Third Party Inspection is available.