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Table 9 - Annual power and thermal efficiency. 71 Fluid butane isobutane pentane isopentane neopentane r-134a r-245fa Annual Power (GWh/y) 28.8 28.1 38.2 36.4 30.1 22.9 29.8 Geo-only ηth (%) 8.71% 10.40% 9.58% 9.81% 9.36% 10.27% 10.07% Hybrid ηth (%) 14.17% 13.69% 17.39% 16.89% 14.61% 9.82% 14.92% for use in the hybrid facility in Newcastle, UT. If land conservation is important, fluids with high power to land ratios should be selected and if power production is important, fluids with high thermal efficiencies should be selected. 6.2 Resulting Thermodynamics and Efficiency Recall the previous discussion of a P-h diagram for binary cycle power plant evaluation (Section 3.2). These diagrams are also useful for some comparison and analysis of the geo-only and hybrid scenarios. Selection of a working fluid for the geothermal-solar thermal power plant implicitly should embody what will be called “room to grow.” This means that in the P-h diagram the geo-only scenario cannot operate near the working fluid’s critical pressure. An example of this is when isobutane is used as the working fluid. The P-h diagram in Figure 32 shows the geo-only scenario for isobutane with an operating pressure of 1.4 MPa (205 psia) and the critical pressure of isobutane is 3.63 MPa (526 psia). This provides the possibility for increasing the working fluid the working fluid’s pressure for the hybrid scenario. The P-h diagram in Figure 32 was created with the assistance of Refprop 9 from the National Institute of Standards and Technology. A Microsoft Excel interface enablesPDF Image | WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH
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