Minggu, 13 September 2009

Geothermal energy



Geothermal energy is energy extracted from the stored heat in the earth. Geothermal energy is derived from the tectonic activity in the earth that occurred since the planet was created. This heat comes from solar heat absorbed by the earth's surface. This energy has been used for heating (room during the winter or water) since the Roman civilization, but now more popular to generate electrical energy. Approximately 10 Riga Watt power geothermal energy has been installed worldwide in 2007, and contributed about 0.3% of total world electricity.

Geothermal energy is economical and environmentally friendly, but limited only to the area near the tectonic boundary layer.

Prince Pietro Minoring Monti tried first geothermal generator on 4 July 1904 in Cinderella geothermal areas in Italy. Group area's largest geothermal resources in the world, called The Geyser, located in California, United States. In 2004, five countries (El Salvador, Kenya, Philippines, Iceland, and Costarring) has been using geothermal energy to produce more than 15% of electricity needs.

Electrical energy

Power generation geothermal energy can only be built around the plate tectonics in which the high temperature of the geothermal resources available in the near surface. Development and improvements in drilling and extraction technology has expanded the reach of building a geothermal power plant from the nearest plate tectonics.
Thermal efficiency of electricity generation from geothermal power tends to be low because of the geothermal fluid is at a lower temperature than the steam or boiling water. Based on the laws of thermodynamics, the low temperature limit the efficiency of heat engines in taking the energy for producing electricity. Time of heat wasted, unless you can be exploited locally and directly, for instance for heating the room. Does not affect the efficiency of the system operational costs such as power plants fossil fuels.

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