當(dāng)涂縣檔案局舉辦新農(nóng)村建設(shè)檔案工-資料下載頁(yè)
2024-10-18 14:47本頁(yè)面
【正文】 ition at around 2021C and 8 bar. ? This steam will run the turbine coupled with a generator. ? Steam is condensed in a condenser and re injected back into the ground by a rejection well ADVANTAGES ? Geothermal energy is cheaper ? Used as space heating for buildings ? Used as industrial process heat ? Geothermal energy is inexhaustible DISADVANTAGES ? Low overall power production efficiency (about 15%) ? Drilling operation is noisy ? Large areas are needed foe exploitation of geothermal energy OCEAN THERMAL ENERGY CONVERSION ? OTEC uses the temperature difference of the sea water at different depths to generate electricity OCEAN THERMAL ENERGY CONVERSION ? OTEC utilizes the temperature difference that exists between the surface waters heated by the sun and the colder deep (up to 1000m) waters to run a heat engine. This source and sink provides a temperature difference of 200 c in ocean areas within 20 of the equator. ? Such a small temperature difference makes energy extraction difficult and expensive. ? OTEC systems have an overall efficiency of only 1 to 3%.
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