Thermodynamic Performance Improvement of Recompression Brayton Cycle Utilizing CO2-C7H8 Binary Mixture

The article deals with the energy and exergy performance analyses of supercritical carbon dioxide recompression Brayton cycle (S-CO2 RBC). This is known to offer maximum efficiency when operating near critical point CO2, which possible in low ambient temperature environment but not warm or hot conditions. CO2-C7H8 binary mixture used improve thermodynamic for warmer percentage C7H8 selected according cycle’s minimum temperature, assumed 50oC. When using mixture, analysis shows that thermal improved by nearly14.5% 8% turbine inlet temperatures 350oC 400oC, respectively. Moreover, exergetic reveals better RBC mixture.