Geothermal Energy USDOE

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Geothermal Energy USDOE ( geothermal-energy-usdoe )

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Geothermal Heat Pumps consumer resistance to geothermal heat pumps does exist due to the high initial purchase and installation cost. However, all geothermal heat pumps eventually provide savings on normal utility bills, some in as little as 3 or 4 years. Overall US Geothermal Potential The sources and functions of various types of geothermal power vary across the nation. The map below shows that this energy can be tapped and harnessed virtually anywhere in the United States. Current research is focusing on increasing efficiency of current technologies, and expanding the use of this resource into new applications. Useful sources of information about geothermal energy resources include: Web Resources: Geothermal Education Office http://geothermal.marin.org Geothermal Technologies Program http://www.eere.energy.gov/geothermal Also called ground source heat pumps, these systems can be used for heating and cooling buildings virtually anywhere, especially in regions where the geothermal potential is low. The internal heat energy of the Earth and the insulation from surface rocks and soils keep the subsurface at a near constant temperature of about 55 °F (13 °C). Wells are drilled to access the ground water at this temperature, and two types of systems can be employed. An open loop system simply pulls water up, runs it through the heat pump to add heat in the summer, and remove heat in the winter, and then recycles it back into the aquifer. A closed-loop system has the same function, except a loop of tubing is buried underground and filled with fluid, usually antifreeze. These systems work well in areas with moderate climates. Supplemental heating and cooling systems are required in more extreme areas. Some

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