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The radial outflow turbine can therefore allow multiple pressure levels cycles to be expanded over a single turbine. The major advantages related to this configuration are the techno-economical savings associated with a lower number of turbines to be installed per plant. This minimizes the plant overall costs, and reduces the amount of rotating equipment, spare parts and maintenance.. Furthermore the plant layout is more compact, reducing the amount of foundations, control equipment and control complexity. 4.1 The Denizli-Tosunlar Multi Pressure Organic Radial Outflow Turbine EXERGY have applied this unique and new configuration in the Denizli-Tosunlar geothermal field in Turkey, for Akca Enerji. The Denizli-Tosunlar is of water dominated type and geothermal plant has the following design characteristics (Yaldrim): Geothermal mass flow per productive well Geothermal fluid temperature Geothermal fluid reinjection temperature Cooling water inlet temperature Cooling water outlet temperature Number of productive and reinjection wells 350 ton/hr 105 °C 60 °C 15 °C 20 °C 4 In order to evaluate the performances of different combinations of thermodynamic cycles and organic working fluids, a thermodynamic analysis have been performed based on the above conditions. Four different combinations have been investigated : single pressure level cycle with IsoButane, single pressure level cycle with R134a, two pressure level with IsoPentane and 2 pressure level with R245fa. In the comparison, the hypothesis considered are presented in Table 4. Table 4: Hypothesis of the thermo dynamic comparison for the Denizli-Tosunlar ORC binary power plant. Spadacini et al. Parameter Geothermal fluid temperature at ORC plant input Geothermal fluid temperature at ORC plant reinjection Pinch point in the heat exchangers Turbine mechanical efficiency Organic fluid Feed Pump mechanical efficiency Electric Generator efficiency Organic fluid Feed Pump electric motor efficiency Unit of measure [°C] [°C] [°C] - - - - Value 105 ≥60 5.0 82.0 % 70.0 % 97.0 % 95.0 % The results of the analysis are shown in Table 5 where is compared the power output of the four combinations, having put as basis the outputs realized adopting worst combination, thus the 1 pressure level cycle and Isobutane. 9PDF Image | The First Geothermal Organic Radial Outflow Turbines
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