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Spadacini et al. Figure 8: Process flow diagram of a regenerative 2 pressure level cycle. The state of the art indicates that the technologically advanced multi pressure level geothermal binary systems require at least one turbine per pressure level, to expand the organic vapor, and these turbines are normally installed with an overhung configuration (Di Pippo, 2005). The radial outflow turbine gives the possibility to employ a different solution. In fact, in order to expand multi pressure flows in the same axial turbine, it would be necessary to enlarge the space between the disks, allowing a second flow to be inserted to mix with the primary flow; the mixed flow will be then expanded in the remaining stages. As a consequence the shaft length of the axial turbine must increase, resulting in several rotordynamics problems for the overhung configuration, as the distance between the center of gravity of the turbine disks and the bearings consequently increases. As a matter of fact actually it appears not possible to design such a turbine. At the same time, having a single-disk / single stage configuration, the radial inflow turbine does not allow multiple pressure entries. A different scenario is instead provided by the radial outflow turbine: its unique single disk / multi-stage configuration makes it possible to enlarge the spacing between the stages (see Figure 9), allowing a low pressure flow to enter the turbine, whilst still maintaining an overhung configuration without any negative rotordynamic consequences. Figure 9: Schematic drawing of the multi-pressure radial outflow turbine. 8PDF Image | The First Geothermal Organic Radial Outflow Turbines
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