Aluminum Extruded Serrated Finned Tube for Heat Exchanger
Extruded serrated finned tube size and material:
| Extruded serrated finned tube size and material | ||
| Tube OD | 10~51 (mm) | 0.4”~2” |
| Tube Wall Thk | 1.65~3.0 (mm) | 0.065”~0.118” |
| Tube Length | ≤18,500 (mm) | ≤60.7 ft |
| Fin Thk | 0.3~1.2 (mm) | 0.012”~0.047” |
| Fin Height | 5~16 (mm) | 0.2”~0.63” |
| Fin Pitch | 100~555 (mm) | 3~14 FPI |
| Serrates | 12or 24 | 12 or 24 |
| Fin Type | Extruded | |
| Material Combinations | ||
| Fin Material | Aluminum (most common grade:Alu.1100, Alu.1060, Alu. 6063) | |
| Copper | ||
| Tube Material | C.S. (most common grade: A179, A192,SA210 GrA1/C,A106 Gr B ) | |
| S.S. (most common grade: TP304, 316, 321, 347,A789) | ||
| Copper (most common grade:UNS12200,14200, 70600, CuNi70/30, CuNi 90/10) | ||
| Titanium (most common grade: B338Gr2) | ||
| Applied Temperature | 300°C | |
| Type of Service | Medium temperature, severe atmospheric corrosive environment. | |
Extruded Serrated Fin Tubes: Design, Manufacturing and Applications
1. Introduction to Extruded Serrated Fin Tubes
Extruded serrated fin tubes represent an advanced heat transfer technology where continuous fins with serrated edges are integrally formed on the base tube through an extrusion process. This manufacturing technique creates a monolithic structure without any mechanical joints between the fins and the base tube, eliminating thermal contact resistance.
2.Extruded Serrated Finned Tube Manufacturing Process
The production involves:
- Material Selection: Typically carbon steel, stainless steel, or copper alloys
- Extrusion Process: The base tube is forced through a special die while simultaneously extruding fins from the tube wall
- Serration Formation: Precision cutting tools create the characteristic serrated pattern on fin edges
- Finishing: May include heat treatment, surface coating, or dimensional verification
Key process parameters include extrusion temperature (typically 800-1200°C for steel), die design, and serration geometry control.
3.Extruded Serrated Fin Tube Design Characteristics
- Fin Geometry:
- Fin height: 5-20mm
- Fin density: 200-500 fins/meter
- Serration depth: 1-3mm
- Material Integrity: Metallurgical bond between fin and base tube
- Surface Features: Rough serrated edges enhance turbulence
4.Extruded Serrated Fin Tube Thermal Performance Advantages
The serrated design provides:
- 30-50% higher heat transfer coefficients compared to smooth fin tubes
- Improved performance in gas-side heat transfer
- Reduced fouling tendency due to enhanced turbulence
- Stable performance over wide temperature ranges
5.Extruded Serrated Finned Tube Mechanical Properties
- Tensile strength comparable to base tube material
- Excellent resistance to thermal cycling
- High vibration resistance
- Minimal fin loosening risk
6.Extruded Serrated Finned Tube Industrial Applications
Power Generation:
- Economizers in coal-fired boilers
- Air preheaters
- Heat recovery steam generators
Process Industries:
- Chemical reactors
- Refinery heaters
- Waste heat recovery units
Other Applications:
- HVAC systems
- Industrial drying equipment
- Marine heat exchangers
7.Extruded Serrated Fin Tube Selection Considerations
When specifying extruded serrated fin tubes, engineers must evaluate:
- Operating temperature and pressure
- Corrosion environment
- Fouling potential
- Thermal expansion requirements
- Cost-effectiveness analysis
8.Extruded Serrated Finned Tube Maintenance Aspects
- Easier cleaning than embedded fin types
- Resistant to fin collapse
- Long service life with proper material selection
9.Extruded Serrated Finned Tube Comparison with Alternative Technologies
Compared to other fin tube types:
- Better than wrapped fins in high-temperature service
- More efficient than studded tubes in gas applications
- More durable than bonded fins in corrosive environments
10.Extruded Serrated Finned Tube Future Developments
Emerging trends include:
- Nano-coatings for enhanced performance
- Advanced alloys for extreme conditions
- Computer-optimized serration patterns
- Additive manufacturing possibilities
Conclusion
Extruded serrated fin tubes offer an optimal combination of thermal efficiency and mechanical reliability for demanding heat transfer applications. Their unique design continues to make them the preferred choice in numerous industrial sectors where enhanced heat transfer and operational durability are critical requirements.