HOW IT WORKS – GROUND EXCHANGER
The Ground Exchanger is the part of the Geothermal Heating and Cooling System that removes the available heat from the earth (soil or water, depending on the type of geothermal ground exchanger used).
All geothermal systems can be broken down into two main categories based on the type of ground exchanger:
- Open Loop Geothermal Systems
- Closed Loop Geothermal Systems
Open Loop Geothermal Systems typically involve water being pumped through a ground source heat pump from a lake, river, or aquifer (groundwater well). The water is returned to its source with no environmental impact. The geothermal system works by removing heat energy from the water and transferring it to the home via the geothermal heat pump.
Closed Loop Geothermal Systems use a water/antifreeze mixture that is pumped between a ground source heat pump and the ground exchanger. The geothermal ground exchanger is made from high density polyethylene pipe. The pipe is placed vertically in drilled boreholes, buried horizontally in trenches, or coiled at the bottom of lakes. The geothermal system works by having the ground exchanger absorb heat from the earth and transfer it to the home via the ground source heat pump.
Both Open Loop Geothermal Systems and Closed Loop Geothermal Systems can be installed in Central and Northern BC. Both types of Geothermal Systems are able to provide 100% of the heating load required by your home. The specific type of Geothermal Ground Exchanger that would work for your home is dependent on the available property, which would be discussed during the initial site visit and verified during the design of your Geothermal Heating and Cooling System.
An example of a Closed Loop Ground Exchanger from Prince George, BC is showcased in our Projects.
The heat from the Geothermal Ground Exchanger, either Open or Closed Loop Geothermal System, is then transferred through the Refrigerant Loop.