Geothermal Energy - Geothermal Energy Sources of Earths...

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Geothermal Energy Geothermal Energy
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Sources of Earth’s Internal Energy Sources of Earth’s Internal Energy •70% comes from the decay of radioactive nuclei with long half lives that are embedded within the Earth Some energy is from residual heat left over from Earths formation. The rest of the energy comes from meteorite impacts.
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Different Geothermal Energy Different Geothermal Energy Sources Sources Hot Water Reservoirs : As the name implies these are reservoirs of hot underground water. There is a large amount of them in the US, but they are more suited for space heating than for electricity production. Natural Stem Reservoirs : In this case a hole dug into the ground can cause steam to come to the surface. This type of resource is rare in the US. Geopressured Reservoirs : In this type of reserve, brine completely saturated with natural gas in stored under pressure from the weight of overlying rock. This type of resource can be used for both heat and for natural gas.
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Normal Geothermal Gradient : At any place on the planet, there is a normal temperature gradient of +30 0 C per km dug into the earth. Therefore, if one digs 20,000 feet the temperature will be about 190 0 C above the surface temperature. This difference will be enough to produce electricity. However, no useful and economical technology has been developed to extracted this large source of energy. Hot Dry Rock : This type of condition exists in 5% of the US. It is similar to Normal Geothermal Gradient, but the gradient is 40 0 C/km dug underground. Molten Magma : No technology exists to tap into the heat reserves stored in magma. The best sources for this in the US are in Alaska and Hawaii.
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Direct uses of geothermal energy is Direct uses of geothermal energy is appropriate for sources below 150 appropriate for sources below 150 0 C C space heating air conditioning industrial processes drying Greenhouses Aguaculture hot water resorts and pools melting snow
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