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5. CONCLUSIONS This paper has presented a new turbine technology for geothermal energy exploitation: the Exergy organic radial outflow turbine. The mechanical and fluid dynamics advantages of the overhung radial outflow turbine has been explained in detail, having as reference the overhung axial turbine which is the reference turbine for the geothermal binary power plants. The above advantages have been demonstrated in the first installations of the organic radial outflow turbine in a geothermal field, the Bagnore power plant of ENEL Green, where the expected design efficiency has been modeled and calculated to be significantly higher (+4.5%) than the reference binary turbine. The current and future development of such turbine configuration for multi pressure level cycles have then been presented where the multi pressure radial outflow turbine has been modeled and comprehensive thermodynamic analysis has been conducted. The multi pressure radial outflow turbine is clearly an important innovation for the geothermal field, particularly for small size and low temperature geothermal applications, ie. less than 5 MWe with a resource < 120 °C, where the volumetric flows and enthalpy heads are thus limited. For all the above, the following can be concluded: 1. The EXERGY radial outflow turbine has an higher efficiency compared to traditional organic turbines and this is well documented from first experimental results; 2. The EXERGY radial outflow turbine has been demonstrated to have very low vibrations compared with the ISO Standard values; 3. The EXERGY radial outflow turbine, thanks to its single disk multi-stages unique design, makes possible to expand multi pressure flows with a single turbine. REFERENCES Di Pippo, R.: Geothermal power plants: principles, applications and case studies, Elsevier, (2005). Dixon, S.L.: Fluid mechanics and thermodinamics of machinery, Butterworth-Heinemann, (1998). Lakshminarayana, D.: Fluid dynamic and heat transfer of turbomachinery, John Wyley & Sons, (1986). Poling, B.E., Prausnitz, J.M., O'Connell, J.P.: The properties of gas and liquids, McGraw-Hill, (2000). Bertini, G., Cappetti, G., Dini, I., Lovari, F.: Deep drilling results and updating of geothermal knowledge on the Monte Amiata, (1995). Frassinetti, M., Rizzi, D., Serafino, A., Centemeri, L., Spadacini, C.: Operational results of the world’s first orc radial outflow turbine, and its future development, ASME ORC 2013, Proceedings, 2nd International Seminar on ORC Power Systems, Rotterdam, The Netherlands, (7/8 October 2013). Spadacini, C., Centemeri, L., Xodo, L.G., Astolfi, M., Romano, M.C., Macchi, E.: A new configuration for organic Rankine cycle power systems, Proceedings, 1st International Seminar on ORC Power Systems, TU Delft, The Netherlands, (22/23 September 2011). Yildirim, N.: Denizli Tosunlar geothermal project Wells AK-3 and AK-6, (2013) – Unpublished. 11 Spadacini et al.PDF Image | The First Geothermal Organic Radial Outflow Turbines
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