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6. FEASIBILITY 6.1 Process Simulations Both daytime and night scenarios for the hybrid geothermal-solar thermal power plant were set up in the Promax process simulator. This was done as a second method of performing the power cycle calculations to ensure accuracy of previous results. The process simulator allows complex calculations with many variables to be done quickly and accurately. For all scenarios it was assumed that: there were no pressure losses in the heat exchangers the working fluid left the evaporators as a saturated vapor the air cooled condenser had air available at 70°F (21.1°C) 80% polytropic efficiency in the turbines 85% efficiency in the pump When the DNI is at or above 750 W/m2, the following assumptions were made: the working fluid was preheated by the geothermal brine to 220°F (104.4°C) the solar field operates at 70% efficiency (Padilla, 2011) the solar field is 35% of the total land area required (Manente, 2011) With these assumptions the process simulation programs was set up in Promax. Figure 30 shows an outline of the simulated process for geothermal only scenario. In this scenario the “Brine In” stream was set at 1,800 gallons per minute with an inlet temperature of 240°F (115.6°C) and the “Brine Out” stream was set to 150°F (65.5°C). The inlet energy stream for the “Solar HX” heat exchanger was set to zero because at conditions below thePDF Image | WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH
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