Energy, exergy, economic and exergoenvironmental analyses of transcritical CO2 cycle powered by single flash geothermal power plant

Abstract The need for energy is increasing worldwide as the population has a continuous trend of increase. restrictions on sources are becoming tougher authorities set these developed and developing countries. This leads to looking other alternative replace conventional sources, leading greenhouse emissions. Environmentally friendly (renewable energies), example, geothermal, solar wind, viewed clean sustainable sources. Among kinds geothermal one best options because, like wind it does not depend weather conditions. In this work, single flash power plant used transcritical CO2 proposed. exergy analysis proposed combined been performed possible operating mode discussed. effects parameters such separator pressure, condenser temperature turbine inlet pressure pinch point efficiency, efficiency output determined Our results indicate that highest destruction in vapor generator 182.4 kW followed by 106 kW, then 82.81 pump 58.76 kW. lowest rates occur components where exactly zero rate. also show produces more better efficiencies (first law second law) than stand-alone plant. Finally, Nelder–Mead simplex method applied determine optimal pumps input efficiency. should be operated at lower reduce damage environment. As increases, environmental effectiveness coefficient decreases sharply until reaches minimum value 1.2 1.7 MPa starts impact sports improvement opposite damage. Therefore, from an view, recommended operate gas high pressure.