The Canadian Geothermal Well uses the concept of thermal inertia to provide heat and cooling to a building. Thermal inertia refers to the ability of a material to conduct and store heat. In this particular case, it takes advantage of the fact that the ground temperature just beneath the Earth’s surface is warmer than the air above during the winter and cooler in summer.
The well apparatus must be attached to either a natural or a mechanically controlled ventilation system. ADEME does not recommend connecting it to a dual-flow controlled mechanical ventilation system. View data sheet (in French).
Air is pumped through a pipe buried approximately two metres below the surface and recirculated into the buildings ventilation system. A fan facilitates airflow through the system. See Figure 1.
The following factors need to be considered:
In order to properly plan and configure installation, a thermal analysis of the site must be conducted. This will help determine the system requirements:
For a detailed schematic view LeRoy Merlin
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Translated from French by : Mabelle Ortiz.
|Name||Type of facility||Environment||Country||Swap?|
|Le Nid des Anges||Cottages & furnished rentals||rural||France||No|
Currently there are no local manufacturers, however, installation kits can be purchased for €1,000 to €3,000. Additional expenses include engineering, excavation and grading, as well as ventilation costs. Set-up costs are higher than for conventional heating and cooling systems but the difference is recovered in energy savings.
Download the ADEME (Environment and Energy Management Agency) data sheet (in French).