Geothermal Heating and Cooling

Using the relatively constant temperatures of the earth, or a large body of water, to heat and cool building spaces reduces the amount of energy required for artificial heating and cooling systems.

There are two kinds of geothermal systems in common use for large construction projects, vertical geothermal bores and geothermal ponds.

Vertical geothermal bores use closed vertical loops of sealed pipe placed in wells drilled deep into the earth. Heat is either absorbed or dispersed by a constantly circulated fluid within those pipes. The fluid is then circulated into the building heat pumps where it is used to provide heating for winter and cooling for the summer.

Geothermal ponds couple the principal of evaporative cooling with a mass of water to cool buildings with the use of horizontal loops of pipe deep underwater. Boilers are sometimes used to top-up loop temperature and provide radiant perimeter heating.

Geothermal systems are generally 25 to 40 percent more efficient than other HVAC systems. A stand-alone geothermal system does not produce any greenhouse gases and helps to reduce air and water pollution by minimizing electrical energy consumption. Geothermal systems can also be easier to maintain than the conventional heating and cooling systems due to their simplicity and modular design.

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