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EGEC – EUROPEAN GEOTHERMAL ENERGY COUNCIL high temperature CHP installations : Sudurnes regional heating corporation Svartsengi, Iceland The total performance of the new geothermal cogeneration power plant at Svartsengi is improved by using turbine extractions, instead of high pressure steam, to heat freshwater to 110 °C in heat exchangers. Energy balance calculations show that the utilization efficiency of the power plant OV-5 is improved by 15% with this type of operation and by 14-22% at different heat loads. The turbine model shows that at 21-24 MWe, electrical output and different heat loads, the pressure of the first and second extractions drops below 2.5 bar and 1.3 bar, respectively. At this point, it is necessary to supply high pressure steam to the heat exchangers. Others Some existing so-called geothermal “wellhead generators” (i.e., units <5MWe) have now seen over 20 years of operation. Although most earlier units were put online as stand alone plants, or as the first step in demonstrating the viability of a field prior to build out, recent work has been directed toward the development of combined heat and power projects that couple power production with direct-use applications. The past few years have seen an increased interest, application and research into this technology. As a result, there has been a considerable amount of work done on various working fluids including different organic fluids (e.g., fluoro- hydrocarbons, propane, isobutene, etc.), ammonia, and interest and research into low temperature flash is also on the rise. Beside the two plants described above, recent projects in Austria, including the Rogner Hotel and Spa Eco-Resort in Bad Blumau (fig. 8) and the geothermal district heating project in Altheim (fig. 9), are excellent examples of integrated projects designed to both provide power and supply space heating. Fig. 9: Air-cooled ORC power plant (250 kWe) in the CHP-system in Bad Blumau, Austria (photo ORMAT) 11PDF Image | COMBINED GEOTHERMAL HEAT AND POWER PLANTS CHP
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