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hybrid scenario. The exhaust from the low pressure turbine will be cooled by air in the air-cooled condenser. Once the working fluid is back into the liquid phase, it will be pumped back to a higher pressure than in the geo-only scenario. The required pressure was selected by examination of the P-h diagrams of each working fluid. It was found that there is a pressure at which the enthalpy is maximized for the saturated vapor phase. This pressure was used as the pump pressure and the evaporator pressure. The flow rate of the working fluid was set by ensuring that the working fluid exited the “Geo HX” at 220°F (104.4°C). Figure 31 shows this hybrid process set up in the Promax process simulation software. Table 5 shows the operating conditions of the hybrid geothermal-solar thermal power. In Table 5 fluid rate is the mass flow rate of the working fluid, pump in the pressure of the working fluid after leaving the pump and operating pressure of the evaporator, HP turbine outlet and LP turbine outlet are the pressures of the exhaust of each turbine, Tevap is the operating temperature of the evaporator and Tcond is the operating temperature of the condenser. Notice that in Table 5 all of the LP Turbine Outlet pressures are the same as the Turbine Outlet pressures of Table 3. These specific outlet pressures are required for each fluid to be condensed by the air. Similarly, the temperature in the condenser for the hybrid scenario shown in Table 5 is the same as in the geo-only scenario shown in Table 3. The evaporator temperatures are much higher than for the geo-only scenario. This is due to the increase in the working fluid pressure which requires a higher temperature to evaporate. Since all of the temperatures are still well under the maximum operating temperature of Therminol VP-1 heat transfer fluid it remains a possible choice in the 67PDF Image | WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH
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