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Different geothermal water temperatures are considered in the present analysis and an optimal performance is achieved at 165oC which was considered as a base case for the analysis. Both energy and exergy efficiencies are calculated as 16.37% and 48.8%, respectively, at a hot source temperature of 165oC. The evaporator and the condenser have the highest exergy destruction rates, accounting for about 75% of the total exergy destruction rate of the overall system. The exergoeconomic factor values show relatively high values for the pump and expander and moderate values for the heat exchanger devices in the system. The effects of changing the dead state temperature, evaporator pressure and inlet temperature of the expander on the system thermodynamics and thermoeconomic parameters are also studied. The increase of the dead state temperature value causes an increase in the cost rate of the exergy destruction in the system. Table 5 Exergy and Exergoeconomic parameters at different geothermal temperature values Component Condenser Evaporator Expander Pump RHE Condenser Evaporator Expander Pump RHE Condenser Evaporator Expander Pump RHE Condenser Evaporator Expander Pump RHE ̇̇ [KW] 930.3 1419 504.9 16.78 160.7 1033 1009 530.6 18.31 73.35 1054 1024 515 17.09 103.7 [%] [$/h] Tgeo = 160 oC 30.68 32.27 46.8 65.14 16.65 78.05 0.55 1.198 5.3 47.6 Tgeo = 165 oC [-] [ %] 0.2934 59.27 0.388 66.33 0.4454 72.51 4.657 94.5 1.017 59.56 0.2804 59.47 0.404 79.18 0.494 73.35 4.483 94.51 1.549 71.36 0.1878 58.06 0.4151 78.8 0.5075 74.43 4.596 94.56 1.347 69.22 0.2327 58.52 0.4232 76.03 0.4936 74.24 4.637 94.54 1.255 65.7 38.78 37.88 19.92 0.69 2.75 34.8 34.58 74.86 1.291 25.7 Tgeo = 170 oC 38.84 33.07 37.73 36.47 18.98 70.76 0.63 1.214 3.82 31.5 Tgeo = 175 oC 1008 35.76 1153 40.9 508.1 18.02 16.79 0.6 132.5 4.7 33.5 41.19 71.45 1.196 38.94 13PDF Image | Exergoeconomic Analyses and Optimization of Geothermal ORC
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