It is the kind of energy that is present under the surface of the earth’s crust. The word (geothermal) GEO is derived from the Greek word which means “Earth’ and thermal meaning is ‘Heat’. It is considered to be the renewable source of energy. It means that its energy can be converted into many forms. People take a lot of benefit from thermal energy. It is used for heating the buildings and producing electricity from it.
In volcanic areas, containers and pools of hot underground water get raised up a borehole, because of their own pressure and then convert into steam for driving a turbine at the surface. But in most of the universe, the rocks that are encountered with the drilling equipment are barren and dry, impermeable water repellant rocks for instance, granite, so the geothermal system for generating electricity has to be devised.
1. Pumping of cold water:
Cold water is raised at elevated pressure inside the injection well. The water makes natural cracks in the layer for expanding. It permits the water to seep to the side via the hot rock. This is exactly the same like the freaking procedure that is utilized for the extraction of gas and oil, but the harmful, poisonous solvents are not required for it.
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2. Hot water extraction:
Many ‘production wells’ are grounded also in the near areas for permitting the hot, warmed up water move back out of the rock. Boring these wells incorporates a definite amount of luck because they might have to hit and knock one of the fissures that have wideness of less than 5 centimeters for extracting the water. The latest ‘Geo-imaging’ technology has been revamped. The hit rate, it is 80 percent much higher than that of the old rate of twenty five percent.
3. Generation of electricity:
At the surface, the warm water is delivered via the help of heat exchanger, especially for boiling a secondary fluid that is known as butane, it produces a gas of high pressure for running a turbine, producing the electricity. The cooled water is then forced back into the layers of rock strata.
