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WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH

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WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH ( working-fluid-selection-for-an-increased-efficiency-hybridiz )

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use of this program to calculate thermodynamic data. Many working fluids can be interchanged quickly to obtain electric production rates, heating and cooling duties of the heat exchangers and parasitic loads from pumps. When selecting a working fluid, the q-T diagram must also be taken into account by doing a pinch point analysis (as described in section 3.2). This was also done in the Excel interface to Refprop program and theresulting q-T diagram is seen in Figure 33. The Promax process simulator also produces q-T diagram (Figure 34). The difference between these two q-T diagrams is that the calculation of energy transferred in Figure 33 was based on a percentage of the total heat transferred whereas, for the Promax simulations shown in Figure 34 the energy transferred was based on a measured amount of energy. Regardless, the important feature of the q-T diagram is that the heat supply and heat demand lines do not cross, and the heat demand line must always be below the heat supply line. If this were not the case, the heat energy would transfer in the reverse direction, meaning that the working fluid would be cooled instead of being heated by the geothermal brine. Figure 32 - P-h diagram of isobutane in geo-only scenario. 72

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WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH

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