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hybrid scenario. Table 6 shows the results of the operating conditions specified in Table 5. The results summarized in Table 6 demonstrate that the increase in pressure in the working fluid is accompanied by an increase in thermal efficiency and an increase in power production. As previously explained, the increase in power production relates to the increase in the working fluid flow rate. In order for the hybrid scenario to function, there is an energy requirement from the sun. The geothermal brine was only used to preheat the working fluid to 220°F (104.4°C) and the heat transfer fluid from the solar field would supply the remainder of the heat to preheat and evaporate the working fluid. Table 7 shows the amount of energy required to complete the preheat and evaporation, solar field size and total land size can be seen in Table 6. The computations in Table 7 were based on a design DNI level of 750 W/m2, an energy collection efficiency of 70% for the solar field (Padilla, 2011) and the solar field is 35% of the land area (Manente, 2011).3 It is easily seen that the greater the thermal energy requirement from the “Solar HX” the larger the land area required. With each Table 6 - Results of hybrid geothermal-solar thermal operation. 69 Working Fluid butane isobutane pentane isopentane neopentane r-134a r-245fa HP Turbine (MWe) 3.73 1.87 6.81 5.87 3.75 0.06 3.03 LP Turbine (MWe) 4.56 4.58 5.87 5.69 4.72 3.02 4.83 Total Power (MWe) 8.29 6.45 12.68 11.56 8.47 3.08 7.86 Pump ηth (MWe) (%) 0.62 14.17 0.53 13.69 0.61 17.39 0.62 16.89 0.6 14.61 0.45 9.82 0.44 14.92 3 The remaining area allow access to the panels for maintenance, cleaning and power block constructionPDF Image | WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH
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