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open-loop geothermal heat pump system
Also known as an direct system, a geothermal heat pump system that circulates water drawn from a ground or surface water source. Once the heat has been transferred into or out of the water, the water is returned to a well or surface discharge (instead of being recirculated through the system). This option is practical where there is an adequate supply of relatively clean water, and all local codes and regulations regarding groundwater discharge are met.
Related category
• GEOTHERMAL ENERGY AND POWER
Source: US Department of Energy
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