Lord Fin Tube-Extruded Serrated Aluminum Finned Tubes
Extruded Serrated Aluminium Finned Tubes
Extruded serrated aluminum finned tubes represent a significant advancement in heat transfer technology, offering superior thermal efficiency and durability in demanding industrial applications. As stainless steel pipe industry experts, we provide this comprehensive guide to help engineers and procurement specialists make informed decisions.
What Are Extruded Serrated Aluminum Finned Tubes?
Extruded Serrated Finned Tubes are advanced heat transfer components that combine the excellent thermal conductivity of aluminum with enhanced surface area through serrated fin design. Unlike standard extruded aluminum fin tubes, the serrated configuration creates turbulent airflow, significantly improving heat transfer coefficients by 15-25% compared to smooth fin designs.
The manufacturing process involves compressing an aluminum tube over a base tube (typically carbon steel, stainless steel, or other alloys), creating a metallurgical bond through cold extrusion. This bimetallic construction ensures the aluminum fin is permanently attached to the base tube, with no air gaps that could impede heat transfer.
Technical Specifications and Performance Data
Maximum Operating Temperature
300°C continuous operation
350°C intermittent operation
Thermal Conductivity
Aluminum fins: 201 W/m·K
Base tube (carbon steel): 54 W/m·K
Pressure Rating
Dependent on base tube material and thickness
Typically 150-600 PSI for standard applications
ASTM A179 Extruded Serrated Aluminum Finned Tubes
| ASTM A179 Extruded Serrated Aluminum Finned Tubes | ||||
|---|---|---|---|---|
| Base Tube Material | Fin Material | Tube Length (mm) | Serrated Number | Fin Tube Quantity (Pc) |
| ASME SA179 | Aluminum | 5200 | 24 | 660 |
| Base Tube O.D (mm) | Base Tube Thickness (mm) | Fin Height (mm) | Fin Thickness (mm) | Fin Pitch (mm) |
| 25.4 | 2.77 | 12.7 | 0.4 | 2.54 |
ASTM A214 Extruded Serrated Aluminum Finned Tubes
| ASTM A214 Extruded Serrated Aluminum Finned Tubes | ||||
|---|---|---|---|---|
| Base Tube Material | Fin Material | Tube Length (mm) | Serrated Number | Fin Tube Quantity (Pc) |
| ASME SA214 | Aluminum | 10200 | 24 | 272 |
| Base Tube O.D (mm) | Base Tube Thickness (mm) | Fin Height (mm) | Fin Thickness (mm) | Fin Pitch (mm) |
| 25.4 | 1.65 | 15.8 | 0.4 | 2.54 |
Extruded Serrated vs. Other Fin Types
| Fin Type | Heat Transfer Efficiency | Airside Pressure Drop | Fouling Resistance | Maximum Temperature | Cost Index |
|---|---|---|---|---|---|
| Extruded Serrated | Excellent (100%) | Medium-High | Good | 300°C | 1.0 |
| Extruded Solid | Good (85%) | Medium | Good | 300°C | 0.9 |
| L-Footed | Good (80%) | Medium | Fair | 250°C | 0.8 |
| G-Footed | Good (82%) | Medium | Fair | 250°C | 0.85 |
| Embedded | Fair (75%) | Low-Medium | Poor | 200°C | 0.7 |
Advantages of Extruded Serrated Fins
Enhanced Thermal Performance
The serrated fin design creates turbulence in the airflow, breaking up the boundary layer and significantly improving heat transfer coefficients. Independent testing shows a 18-27% improvement in heat transfer efficiency compared to solid fin designs under identical operating conditions.
Superior Mechanical Integrity
The extrusion process creates a metallurgical bond between the aluminum fin and base tube, ensuring permanent contact with no thermal resistance at the interface. This bond maintains integrity through thermal cycling and mechanical vibration.
Benefits of Extruded Serrated Finned Tubes
1. Exceptional corrosion resistance: Aluminum fins provide excellent protection against atmospheric corrosion, with the base tube completely encapsulated and isolated from the environment.
2. Easy maintenance and cleaning: The smooth fin surface and open design facilitate cleaning and reduce fouling compared to more complex fin configurations.
3. Optimized thermal efficiency: The serrated design maximizes heat transfer surface area while maintaining structural integrity.
4. Reliable long-term performance: The extruded bond ensures fins remain securely attached without loosening, deformation, or performance degradation over time.
5. Reduced equipment footprint: Higher heat transfer efficiency allows for more compact heat exchanger designs, saving valuable space in industrial applications.
Extruded Serrated Aluminium Finned Tubes Applications
Heat Recovery Systems
Waste heat recovery from flue gases and process streams
Air Cooled Heat Exchangers
Process cooling in refineries and chemical plants
HVAC Systems
Large commercial and industrial heating/cooling systems
Power Generation
Feedwater heaters, condenser cooling, and turbine systems
Material Compatibility and Selection
Extruded serrated aluminum finned tubes can be manufactured with various base tube materials to suit specific application requirements:
| Base Tube Material | Recommended Applications | Temperature Range | Corrosion Resistance |
|---|---|---|---|
| Carbon Steel (A179, A214) | General purpose, non-corrosive environments | -20°C to 300°C | Fair (requires coating if exposed) |
| Stainless Steel (304/304L) | Moderate corrosive environments, food processing | -200°C to 400°C | Good |
| Stainless Steel (316/316L) | Highly corrosive environments, chemical processing | -200°C to 400°C | Excellent |
| Copper & Copper Alloys | Marine applications, high thermal conductivity requirements | -100°C to 200°C | Good (specific to environment) |