Thermonexus provides products and turnkey solutions to connect
Optimized thermal connection to the earth is the single most
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HPGX® selected as the solution for the Longfellow NHS. 
The National Park Service is upgrading their geothermal system after 10 years of struggling with two problematic standing column wells. A closed loop design was chosen to eliminate future maintenance issues. The NPS selected HPGX® because it can deliver the most energy per foot of any closed loop technology. The site has limited space, so finding an option that could deliver the needed BTU's from a small parcel was a big plus.
The two standing column wells suffered from iron fouling, clogged flow paths and ultimately shroud failure causing them to short circuit. Without flow in contact with the total borehole, the wells could not deliver the needed thermal energy.
Both standing column wells were converted to closed loop with RescueFit™ re-using most of the boreholes and recovering the drilling investment.
Since the system is now closed and no longer has a bleed, four additional 800 ft. HPGX® boreholes were added to augment capacity. The system is now completely sealed from the environment, eliminating many maintenance issues.
New England Test site - One year+ on water. Exceptional performance.
HPGX® continues to demonstrate high performance. The Thermonexus test site recently completed its first full year of operation with great success. The system has a connected load of 4 tons in the winter and 6.5 tons in the summer. Operating data is collected at five-minute intervals to monitor temperature and measure the amount of energy exchanged with the ground through 2 x 260 ft HPGX® boreholes. The site continues to operate with great efficiency. COP was measured at 4.46 (1st stage) and 4.1 (2nd stage) with the unit operating in 1st stage 69% of the time. Winter water temperatures remain in the low 40's, eliminating the need for any antifreeze solution and improving year-round pumping efficiency.
