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Session 1 GEOTHERMALL ELECTRICITY PRODUCTION: POSSIBILITIES, TECHNICAL AND ECONOMIC FEASIBILITY IN CENTRAL EUROPEAN REGION Ruggero Bertani: GEOTHERMAL ENERGY: AN OVERVIEW ON RESOURCES AND POTENTIAL El Salvador (967) Kenya (1,088) Philippines (9,253) Iceland (1,483) Costa Rica (1,145) Nicaragua (271) Guadeloupe (France) (102) New Zealand (2,774) Indonesia (6,085) Mexico (6,282) Guatemala (212) Italy (5,340) USA (17,917) Japan (3,467) 0% 5% 10% 15% 20% 25% Figure 4. The fourteen countries with the highest % share of geothermal energy in their national electricity production (Fridleifsson, 2007). Numbers in parenthesis give the annual geothermal electricity production in GWh in 2004 (Bertani, 2005). Figure 5. Direct applications of geothermal worldwide in 2004 by percentage of total energy use (Lund et al. 2005). Space heating, of which more than 80% are district heating, is among the most important direct uses of geothermal energy. Preferred water delivery tempera- ture for space heating is in the range 60- 90°C and commonly the return water temperature is 25-40°C. Conventional radiators or floor heating systems are typically used, but air heating systems are also possible. If the temperature of the resource is too low for direct application, geothermal heat pumps can be used, as 4PDF Image | GEOTHERMAL ENERGY: AN OVERVIEW ON RESOURCES AND POTENTIAL
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