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difference between the turbine exhaust and the pressure which must be produced by the pump. In an actual plant, a pressure gauge would communicate with the pump to maintain the pressure in the evaporator at the correct value. Table 4 shows that, depending on the working fluid, the power produced will range from 2.02-2.66 MWe and the thermal efficiency varies from 8.71%-10.40%. When the DNI is above the 750 W/m2 design level, the geothermal-solar thermal hybridized plant will commence operation. This would require daily start up and shut down of the high pressure turbine. The geothermal brine still experiences a reduction in temperature from 240°F (115.6°C) to 150°F (65.5°C), but is now used to preheat the working fluid. After the working fluid is preheated by the geothermal brine to 220°F (104.4°C), it is evaporated by the heat transfer fluid from the solar field. In the hybrid scenario, the working pressure of the fluid was increased to the pressure which allowed for maximum enthalpy in the vapor phase and the flow rate was increased such that the geothermal brine preheated the working fluid to 220°F (104.4°C). Both of these criteria allowed for the most efficient operation of the hybrid facility. The maximum operating temperature of the heat transfer fluid needs to be kept in mind. A heat transfer fluid such as Therminol VP-1 has a maximum operating temperature of 750°F (398.9°C). This means that the evaporator operating temperature must be lower than the maximum operating temperature of the heat transfer fluid. After the working fluid is evaporated, it will pass through the high pressure turbine. The high pressure turbine will extract useful energy from the working fluid and its exhaust will be at the same pressure as the pressure of the geo-only turbine pressure inlet. By designing the plant in this manner the same turbine used in the geo-only scenario can be used as the low pressure turbine in the 66PDF Image | WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH
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