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system components. The superheating temperature is kept constant at the value determined from the optimization analysis, shown in Table 4. Table 4 Optimization results for the system operation at different geothermal source temperatures. Operating & Design Parameters Thf,out, oC Tcf,out, oC Tcd, oC δTsubcool, oC δTsuperheat, oC Texp,,in, oC Tpinch,cd, oC Tpinch,ev, oC Acd, m2 Aev m2 ARHE m2 Atot m2 cp, $/GJ ̇ ,$/h Ψ% η% Opt ̇ ,kg/s ̇ ,kg/s ̇,kg/s Geothermal Source Temperature 160 oC 116.2 28.51 34.26 4.631 17.23 146.1 6.107 12.09 740.6 415.1 149.2 1305 99.64 5379 28.27 17.48 165 oC 78.49 29.33 35.05 3.88 7.197 136.1 5.957 5.347 810.1 390.6 124.8 1326 86.39 4723 48.8 16.37 170 oC 84.34 27.83 35.13 1.874 12.51 141.4 7.736 6.701 639.6 415.5 152.4 1208 83.68 4554 47.49 17.04 175 oC 88.72 28.23 34.98 2.704 15.47 144.3 7.196 9.661 703.6 398.6 168 1270 87.16 4738 46 17.33 0.249 437.8 79.53 72.24 0.2558 0.2598 0.2367 422.6 432.7 154.5 84.36 70.56 78.06 460.4 81.59 74.15 Figures 7 and 8 show the energy and exergy efficiencies and the sustainability index for the performance of the organic Rankine cycle at different expander inlet temperature. From Fig.7, the energy efficiency increases by 5% with the superheating of 30oC over the saturation temperature of the evaporator pressure, while the exergy efficiency decrease for the same range of superheating. Fig. 8 shows that the trend of sustainability index is the same for the exergy efficiency of the overall performance. The effect of increasing the evaporator pressure on the overall system performance for the same expander superheating temperature difference is shown in Figs. 9 and 10. The performance is shown in terms of energy and exergy efficiencies and the sustainability index. Both energy and exergy efficiencies increase with the pressure increase. From the exergoeconomic analysis, the cost rate of the exergy destruction in different components is shown in Table 5. The results are expressed for four different geothermal water inlet 11PDF Image | Exergoeconomic Analyses and Optimization of Geothermal ORC
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