dtfinnedtube.com
Datang is the professional of the specifications for aluminum L-type tension-wrapped finned tubes:
Aluminum L-Foot Tension Wound Finned Tubes Structure & Manufacturing Process
- Forming Method: Aluminum strip is spirally wound onto the base tube (carbon steel/stainless steel) at room temperature using mechanical tension, forming an L-shaped crimped root for mechanical fixation.
- Contact Design: Wrapping tension determines tube-fin bonding strength. Insufficient tension increases contact thermal resistance (high-quality products: ≤0.01 m²·K/W).
L-Foot Finned Tube Performance Parameters
| Characteristic | Parameter/Performance |
|---|---|
| Temperature Limit | Max. 70°C for aluminum fins; bond strength degrades significantly >70°C |
| Heat Transfer Enhancement | Fin surface area expands to 3–5× that of bare tubes |
| Fin Specifications | Aluminum strip thickness: 0.2–0.5 mm; Fin spacing: 2.3–8 mm (adjustable) |
| Anti-Collapse Strength | Low mechanical strength; vulnerable to deformation under impact |
L-type Tension-wrapped Finned Tubes Applications & Limitations
- Recommended Applications:
✓ Low-temperature drying systems (e.g., food spray dryers)
✓ HVAC systems (greenhouse heating, ≤70°C environments) - Restricted Applications:
✗ Steam heat exchange (>150°C causes fin loosening)
✗ Highly corrosive flue gas environments (requires additional galvanization)
Technical Limitation: Dramatically increased contact thermal resistance at high temperatures; gradually being replaced by rolled/grooved or high-frequency welded finned tubes.
Fin tube Technical parameters
| PRODUCT | TYPE | TUBE MATERIAL | FIN MATERIAL | TUBE SIZE | FIN SIZE |
| Heat Exchanger Finned Tube | Extruded Fin Tube | All Kind of Material can be applied | Aluminum A1100 | 15.88~50.8 | 7~11.5FPI |
| Fin Height Max 16mmH | |||||
| L-Foot Fin Tube | All Kind of Material can be applied | Copper C1100, C1220 | 12.70~50.8 | 7~11.5FPI | |
| (Wrap On Type) | Fin Height Max 16mmH | ||||
| G-Fin Tube (Embedded Type) | Aluminum A1100, A1050, A1060 | ||||
| High Frequency Welded Finned Tube | A179 Carbon Steel Tube | Carbon Steel Tube | 12.70~160 | 1.5~7FPI | |
| Stainless Steel Tube | Stainless Steel Tube | 0.8~3.2mm. Thickness | |||
| Alloy Steel Material | Alloy Steel Material | ||||
| Integral Copper & Copper Alloy High Finned Tube | C12200, C11000, C70600 | C12200, C11000, C70600 | 15.88~22.23 | 5~9FPI | |
| Max 12mm. H | |||||
| Oval Finned Tube | Carbon Steel Tube | Carbon Steel Tube | All Size Available | 5~15FPI | |
| Stainless Steel Tube | Stainless Steel Tube | ||||
| Alloy Steel Material | Alloy Steel Material | ||||
| Copper & Copper Alloy Tube | Copper & Copper Alloy Tube | ||||
| Monometallic Fin Tube | Low Fin Tube | Carbon Steel, stainless steel, titanium, copper, brass, nickel alloy, etc. | — | 9.52~40 | 12, 16, 19 28 FPI, etc. |
| Turbo-C Tube | |||||
| Turbo-E Tube | |||||
| Corrugated Tube | All Kind of Material | — | 6.35~40 | 2~9FPI |
