TWISTER(tm) Geothermal Heat Exchanger Technology
Proven technology with a new “twist” - reduces the cost of the vertical loop field by up to 40%!
- Four 3/4” loops
- Cut drilling up to 50%
- 70 % lower BTR
- Centralized tremie system
- Continuous reels or coils
- No field assembly
TWISTER(tm) Geothermal Heat Exchangers are patent-pending systems that allow the simultaneous installation of 4 loops around a central Tremie conduit in a single vertical bore hole.
Borehole with one loop and a Tremie pipe
Borehole with TWISTER Pipe (4 loops and a central conduit)
TWISTER exchangers use 3/4” ASTM D3035/D3350 Cell Classification 445574C SDR 11 or 13.5 HDPE (IGSHPA Requirement) pipe spirally wound around a central 2” center pipe used to guide the Tremie pipe. Supplied on coils or reels, with factory prepared u-fittings, installation is quick and easy. Performance Characteristics are shown in the table:
|
Formation Thermal Conductivity |
Grout Conductivity |
5” Borehole Thermal Resistance (BTR) |
Bore Depth per Ton. |
TWISTED Pipe |
1.6 |
0.4 |
.085 |
130' |
Standard |
1.6 |
0.4 |
.276 |
210' |
Gaia Geothermal Ground Loop Design software has demonstrated that up to 50% reduction in loop length is possible.*
*Results will vary by installation. Follow IGSHPA guidelines
| O.D. |
Center Pipe |
Loop Pipe |
Loops |
ASTM |
Cell Classification |
4.475” |
2” HDPE |
3/4” HDPE (SDR 11/13.5) |
4 |
D3035/D3350 |
445574C |
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