The Direct Expansion DX system is a heat pump that uses the refrigeration cycle principle; in other words, it transfers thermal energy between the ground and the building. The DX geothermal system is made of unique components that help to maximize the amount of heat exchanged with the earth. The DX geothermal field is composed of several wells or boreholes that are 3 inches in diameter and 100 feet deep. Each borehole can provide one ton (average of 12,000 BTU/hour) in energy exchanged. Copper piping, which provides superior thermal exchange, are inserted into the boreholes. Next, highly conductive cement is inserted over the entire length of the borehole to hermetically seal the well, and to stabilize and protect the copper pipes. Pipes can also be installed horizontally at a minimum depth of two metres; however this type of installation requires approximately 1000 Sq. ft. of land per ton of geothermal energy.

The DX geothermal field provides even greater performance because it uses refrigerant to exchange heat with the earth through conductive copper. Traditional geothermal systems use secondary fluid such as antifreeze circulating in high-density polyethylene (HDPE) tubing, a type of material that is not conducive to thermal conduction. So thermal exchange is more efficient when copper is used. The copper is also protected with an anode system that eliminates any risk of oxidation in the event that the ground is slightly acidic. To summarize, the DX geothermal field is smaller and more efficient than an antifreeze geothermal field.

The sun’s energy captured by the earth

Reduce your consumption of fossil fuels and CO2 emissions by using renewable solar energy that is captured on the earth’s surface. Take advantage of the stored heat with the DX geothermal system.

Champ géothermique à forage incliné
Angled well geothermal field

Nearly half of the solar energy that reaches our planet is stored in the earth. This solar energy is available everywhere on our planet. The earth acts as a buffer tank that can store heat during the summer and dissipate it during the winter. Consequently, at a depth of just a few metres below the surface, the earth’s temperature practically remains constant.

Champ géothermique à forage incliné

When space is restricted on the surface, boreholes can be drilled at angles of up to 45 degrees. Thus, impact on the ground surface is reduced to just a few square metres. This is a significant advantage when installing the system on existing buildings

Please contact one of our technical consultants for more information on our various technologies and don’t hesitate to come visit our functional installations in our SHOWROOM. We have functional Direct Expansion technologies for heating and air conditioning and antifreeze geothermal installations on our premises in order for you to familiarize yourself with a geothermal system network.