Thermodynamic and economic analyses of natural gas combined cycle power plants with and without the presence of organic Rankine cycle

This study performs the simulation and energy, exergy, economic analyses of an organic Rankine cycle (ORC) integrated with a natural gas combined cycle. Working fluids studied in this research are ammonia, isobutane, R-11, R-113, R-141b. The power plant ORC simulated using Aspen HYSYS software. results show that leads to improvement thermo-economic indexes plant. sensitivity analysis also demonstrated ammonia isobutane as working highest exergy destruction lowest energy efficiencies; therefore, they unsuitable. On other hand, comparison illustrated among fluids, R-113 is desirable selection. According simulation, it deduced employing fluid net generation increasing by 2.48%, cost electricity decreasing 10.75%, total efficiency 6.02%.