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As the costs per MWh without fundings were calculated to 140 Euro (126 US$), a proposal for additional financial support by the Commission of the European Communities was combined with three other project partners. A funding level of 35% was granted by the Commission. With additional funds from the local government of Upper Austria and the federal government of Austria, the project was completely financed. Negotiations with the local energy supplier "Energie AG - Oberösterreich" followed. Liberalization of the energy market leads to a decreasing reimbursement of the generating costs--but nevertheless an appropriate financial contribution of the energy utility also helped in this case. With that, an economic operation of the power plant by the municipality was then ensured. In 1998, the drill bit went downward once more--40 m away from the first drill hole. In order to reach the geothermal water bearing layer at a horizontal distance of 1700 m, the drill hole had to be deviated from the vertical. This technically ticklish operation started at a depth of 460 m. The drill bit had to be guided several times into the right direction. The deviation operation was performed by Becfield Drilling Services. After eight months of drilling, the final depth was reached. With a total length of almost 3100 m, the drill hole reached the target at 2200 m depth--the white treasure in the Malm karst of the Molasse Basin. The horizontal distance between starting and ending point of the drill hole is 1700 m. Hydraulic tests showed that hot water with 100 L/s at a temperature of 93oC could be produced. The same rate can also be injected. According to the planning, the first well was used for production and the second drill hole as the injection well. The geothermal water is produced by a high temperature downhole pump which is installed at a depth of 290 m. A Rankine turbogenerator was constructed by Turboden in Brescia, Italy. To obtain a high efficiency of the binary cycle, the working parameter of the turbogenerator had to be well adapted to the flow rate and temperature of the produced water. The working fluid had to be non toxic, as there must be no danger of explosion and it should also not affect the ozone layer in any way. A suitable fluid was found by Turboden, a harmless “Fluorocarbon.” The thermal water heats up the working fluid in a heat exchanger. The fluid evaporates at relatively low temperatures of 28-30oC. As steam, it drives the turbine. The vaporized medium is cooled down, condensed and then once again, continues its way through the closed turbine cycle. After using the heat of the geothermal water, it is injected into the underground at a temperature of 70oC. By this measures, the balance of water in the Malm reservoir is maintained. The ORC plant was installed in spring/summer 2000, and first tests started in September 2000. Due to insufficient purification of the cooling water (taken out of a creek), the Generator Inlet Valve Turbine Condensor Condensate pump Evaporator Hot water out Cooling water out Cooling water in Hot water in GHC BULLETIN, MARCH 2002 27 Figure 1. Schematic of the ORC turbogenerator. Electric gridPDF Image | LOW-ENTHALPY POWER GENERATION WITH ORC-TURBOGENERATOR
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