SpiralEdge™ Inner Fin Tubes
Internal grooves and helical ridges for higher fluid-side heat transfer
Internally enhanced SpiralEdge™ Fin 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. This makes them ideal for direct expansion shell-and-tube liquid coolers (DX tubes / evaporator tubes).
These internally enhanced tubes are available in Copper UNS C12200, 90/10 Cupro Nickel UNS C70600, 70/30 Cupro Nickel UNS C71500 and Stainless Steel. 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, 70/30 Cupro Nickel UNS C71500 & Stainless Steel
- • 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.