While the majority of geothermal systems use a closed loop, another option is an open loop system.
Instead of using an antifreeze solution sealed inside the piping, an open loop system uses water from a surface or underground source - such as a pond, lake or well.
The water circulates through the heat pump unit where the heat is extracted; the water is then discharged back into the original source.
Well water designs are the most common and most cost-effective. The well supplies both household water and water for the heat pump. Approximately three gallons per minute of well water are needed per ton of cooling capacity. A 3,000-square-foot, well-insulated home would typically require 10 to 15 gallons per minute.
An important issue with open-loop systems is water quality. Mineral deposits can build up inside the heat exchanger. Iron and other impurities can clog a return well, and organic matter from ponds and lakes can damage a geothermal system. Water should be regularly tested for acidity, mineral content and corrosiveness.
Need more information on Geothermal…
Geothermal allows you to tap into the earth’s natural energy to efficiently and economically heat and cool your home. For more information on geothermal heating and cooling contact the experienced geothermal experts at K. Kelly at 920-469-3500 to get all your geothermal questions answered.
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