SpiralEdge™ Inner Fin Tubes
Internal grooves and helical ridges for higher fluid-side heat transfer
Internally enhanced SpiralEdge™ tubes are designed to provide maximum heat transfer with minimum refrigerant-side pressure drop — delivering an inside heat transfer coefficient typically 2 to 3 times higher than smooth-bore tubes.
SpiralEdge™ Inner Fin Tubes (also called internally finned / internally enhanced / internally grooved tubes) feature a plain outer diameter with internal ridges. The groove geometry increases turbulence and internal surface area, improving heat transfer while helping maintain low pressure drop — ideal for direct expansion shell-and-tube liquid coolers (DX tubes / evaporator tubes).
These internally enhanced tubes are available in Copper UNS C12200 and 90/10 Cupro Nickel UNS C70600. Internally finned tube configurations can be produced with 50 to 70 internal ridges (and other geometries on request), depending on application and customer requirements.
Key Features
- • Plain OD with internal ridges/grooves for higher internal surface area
- • Typically 2–3× higher inside heat transfer coefficient vs. smooth tubes
- • Designed for maximum heat transfer with minimum refrigerant-side pressure drop
- • Available with 50 to 70 internal ridges (other configurations on request)
- • Tube materials: Copper UNS C12200 & 90/10 Cupro Nickel UNS C70600
- • Straight lengths up to 6 meters (longer lengths on request)
- • Custom wall thickness and internal ridge density available on request
Typical Parameters (Internally Finned Tubes)
| Tube Dia | Root Wall Thickness | No. of Ridges | Helix Angle (°) | Ridge Height | Inside Surface Area (m²/m) |
|---|---|---|---|---|---|
| 8.00 mm | 0.30 mm | 40 | 18 | 0.20 mm | 0.026 |
| 9.52 mm | 0.30 mm | 60 | 18 | 0.20 mm | 0.035 |
| 9.52 mm | 0.45 mm | 60 | 18 | 0.25 mm | 0.035 |
| 12.70 mm | 0.40 mm | 60 | 18 | 0.25 mm | 0.047 |
| 12.70 mm | 0.50 mm | 70 | 18 | 0.25 mm | 0.047 |
| 12.70 mm | 0.63 mm | 70 | 18 | 0.25 mm | 0.047 |
| 15.90 mm | 0.50 mm | 60 | 18 | 0.30 mm | 0.065 |
| 15.90 mm | 0.50 mm | 75 | 27 | 0.30 mm | 0.072 |
| 15.90 mm | 0.58 mm | 75 | 27 | 0.30 mm | 0.072 |
* Internally finned tubes with wall thickness and internal ridge density other than above can be produced on request.
* Internally finned tubes with outer diameters up to 25.4 mm are available for specific applications.
* Internally finned tubes are produced in straight lengths up to 6 meters. Bigger lengths can be accommodated on request.