Geothermal energy

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  • 1. GEOTHERMAL ENERGY Umashankar Mali Sem-I Branch-ME3 1 / 10 / 2011 VNS institute of technology, Bhopal
  • 2. IntroductionGeo=EarthThermal=Heat
  • 3. Introduction Geothermal Energy is heat (thermal) derived from earth (geo) Contained in rock and fluid in the earths crust Source of geothermal energy is radioactive decay
  • 4. Geothermal energy Geothermal power is generated wherever water comes in contact with hot rocks below the earth’s surface. The rocks give off heat that makes the water hot enough to turn in to steam. Power companies can drill wells and pump the hot water or steam to the surface, where it can be used to generate energy. in areas where no underground water or steam exists naturally, engineers can pump water into the ground to be heated by hot rocks. Bolivia, Iceland, New Zealand, and the united states have developed geothermal power plants.
  • 5. Types and Application of Geothermal Energy1.Direct use Involves using the heat in water directly Temperature: 38 C-149 C e.g. heating of buildings, industrial processes, greenhouses , aquaculture and resource
  • 6. Types and Application ofGeothermal Energy2. Ground-source heat pumps use the earth or groundwater as a heat source in winter and sink in summer Temperatures: 4˚C to 38˚C Heat pump transfers heat from the soil to the house in winter and from the house to the soil in summer
  • 7. Types and Application ofGeothermal Energy3.Power generation geothermal power plant taps the natural supplies of heat energy that have accumulated inside the earth.
  • 8. Schematic energy of Geo-Thermal energy power plant
  • 9. Geothermal energy plant
  • 10. Indian Scenario Puga Valley (J&K) Godavari Basin Manikara (Himachal Pradesh) Bakreshwar (West Bengal) Tuwa (Gujarat) Jalgaon (Maharashtra)
  • 11. Demerits of Geothermal Energy Heated water may give out after a while- hotspot moves or aquifer pressure drops. Geo thermal hot spots are sparsely distributed. Geothermal energy is quite low grade because the temperature of steam is only between 150 to 200 c(at 100 psi). salts in water can corrode equipment, shorten lifespan. Limited to geographic areas where geothermal heating naturally occurs.
  • 12. Merits of Geothermal Energy Power source during construction Renewable as long as water is heated naturally Much lower greenhouse gas emissions than fossil fuels Meet the needs of electricity demand in limited area An experimental unit as a pilot plant for a larger size installation .