Exergoeconomic Analysis for Optimized Combined Wet and Dry Cooling BinaryPower Plant at Olkaria I, Kenya

• Complete exergoeconomic optimization of binary power plant that includes cooling tower using variable metric minimization method. The research proposed a cost rate equation for wet and introduced sustainability index (SI) eight different working fluids. This study investigated complete comparison dry-cooled plants. Simple organic Rankine cycles (ORC) Olkaria geothermal field in Kenya isobutane types fluids were analysis by the thermo-economic concept (SI). Network generated per heat transfer surface area was optimized objective function, f(obj). Variable method implemented Engineers Equation Solver (EES) applied to optimize plants average fuel fluid at 1.3 $/GJ. contributed mainly investment water-cooled plant. 1,628 kWe 2,594 cooled unit with SI 1.654 2.701 f(obj) 1.5 1.8. For air-cooled plant, ranges from 1.286 1.612 network 1,446 2,469 utilization efficiency 34.77% 59.37% values 0.56 0.89. products range 18.3 $/GJ 20.76 system 20.87 23.4 dry-cooling. Selection suitable based on would be systems lower plant's rates between 76.92 $/hr 135.8 $/hr. capacities are 20,806-20,610 kW isobutene, 24,153-23,928 isobutane, 13,727-13,595 cis-2-butene and, 16,772-16,611 n-butane ambient temperatures 0°C 40°C. Application units advisable where water is scarce colder regions. Thermo-economic concludes presents better decision