Geothermal Energy

Geothermal energy

* Geothermal Energy is heat energy generated and stored in the Earth. Thermal energy is the energy that determines the temperature of matter. The geothermal energy of the Earth's crust originates from the original formation of the planet and from radioactive decay of materials (in currently uncertain but possibly roughly equal proportions). The geothermal gradient, which is the difference in temperature between the core of the planet and its surface, drives a continuous conduction of thermal energy in the form of heat from the core to the surface. The adjective geothermal originates from the Greek roots γη (ge), meaning earth, and θερμος (thermos), meaning hot.

History of Geothermal Energy:

* Hot springs have been used for bathing at least since Paleolithic times. The oldest known spa is a stone pool on China's Lisan mountain built in the Qin Dynasty in the 3rd century BC, at the same site where the Huaqing Chi palace was later built. In the first century AD, Romans conquered Aquae Sulis, now Bath, Somerset, England, and used the hot springs there to feed public baths and underfloor heating. The admission fees for these baths probably represent the first commercial use of geothermal power. The world's oldest geothermal district heating system in Chaudes-Aigues, France, has been operating since the 14th century.The earliest industrial exploitation began in 1827 with the use of geyser steam to extract boric acid from volcanic mud in Larderello, Italy.

What is a geothermal system?

* A geothermal heat pump or ground source heat pump (GSHP) is a central heating and/or cooling system that transfers heat to or from the ground. It uses the earth as a heat source (in the winter) or a heat sink (in the summer). Ground source heat pumps harvest heat absorbed at the Earth's surface from solar energy.

What are the advantages and disadvantages of using geothermal energy?

*There are many advantages to geothermal energy. Geothermal energy is renewable energy because once water or steam is used, it can be pumped back into the ground. It is also clean energy. Geothermal power plants, unlike plants that burn fossil fuels, do not produce greenhouse gases that can be harmful to the atmosphere.

More information:

* The Geothermal Education Office and a 1980 article titled "The Philippines geothermal success story" by Rudolph J. Birsic published in the journal Geothermal Energy note the remarkable geothermal resources of the Philippines.During the World Geothermal Congress 2000 held in Beppu, Ōita Prefecture of Japan held from May to June 2000, it was reported that the Philippines is the largest consumer of electricity from geothermal sources and highlighted the potential role of geothermal energy in providing energy needs for developing countries.

*According to the International Geothermal Association (IGA), worldwide, the Philippines ranks second to the United States in producing geothermal energy. As of 2010, the US had a capacity of 3093 megawatts of geothermal power, while that of the Philippines was 1904 megawatts. The Philippines was followed by Mexico with 958 MW. Early statistics from the Institute for Green Resources and Environment stated that Philippine geothermal energy provides 16% of the country's electricity.By 2005, geothermal energy accounted for 17.5% of the country's electricity production. More recent statistics from the IGA show that combined energy from the nation's six geothermal fields, located in the islands of Luzon, Leyte, Negros and Mindanao, still accounts for approximately 17% of the country's electricity generation. Leyte island is where the first geothermal power plant, a 3 megawatt wellhead unit, started operations in July 1977.Larger-scale commercial production of geothermal power began in 1979 with the commissioning of a 110-megawatt plant at Tiwi field in Albay province. IGA figures as of December 2009 show the nation's installed geothermal capacity stands at 1904 megawatts, with gross generation of 10,311 gigawatt-hrs for all of 2009, representing 17% of the nation's total power generation mix.