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Geothermal Energy District Heating

Geothermal Energy District Heating. San Jose State University FX Rongère March 2008. District Heating. Direct use of geothermal hot water. Geothermal District Heating in the World. Applications are homes and offices, commercial greenhouses, fish farms, food processing facilities, etc.

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Geothermal Energy District Heating

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  1. Geothermal EnergyDistrict Heating San Jose State University FX Rongère March 2008

  2. District Heating • Direct use of geothermal hot water

  3. Geothermal District Heating in the World • Applications are homes and offices, commercial greenhouses, fish farms, food processing facilities, etc. • In 2005, Residential gas consumption in the USA was 4.4 Millions of MMcf, i.e. 45 Billions of Therms Source: International Geothermal Association,http://iga.igg.cnr.it/geoworld/geoworld.php?sub=duses

  4. Example: California Correction Center in Susanville • 5,800 minimum custody inmates, and 1,100 custodial and support staff • Two wells, 460 m deep built in 1982, temperature 72oC and 76oC • Water is not re-injected • 75hp-300 gpm • About 525,000 Therms/y • Cost:$200,000 per well • Total estimated: $500,000 • Pump consumption: 1 GWh/y • Electricty: $.12/kWh • Gas heating: $ 1.2/Therm • Pay back period < 1 year Source: Geoheat Center – Case Study – 2002 www.geoheat.oit.edu

  5. Example: California Correction Center in Susanville • Sketch of the equipment Source: Geoheat Center – Case Study – 2002 www.geoheat.oit.edu

  6. Geology • Crust depth reduction zone, Volcanic activity • Fault, igneous granite covered by low conductivity sedimentary rocks

  7. Normal thermal gradient Susanville

  8. Example: Geothermal District Heating (France) • Warm aquifer (60oC – 80oC) between 500m and 1,500m

  9. Normal thermal gradient Susanville La Courneuve

  10. General lay-out • Double well by directional drilling

  11. La Courneuve Nord • Characteristics: • 2,800 dwellings • A double well 1,500m deep built in 1983, 59oC • Pump: 320 kW for 180 m3/h • About 720,000 Therms/y • Estimated cost: $ 500,000 per well • Total estimated: $ 1.5M • Pump Consumption: 3,200 MWh/y • Electricity: $.12/kWh • Gas heating: $ 1.2/Therm • Pay back period < 4 years Source: Arene Ile de France

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