Triple-Objective Optimization of SCO2 Brayton Cycles for Next-Generation Solar Power Tower

In this paper, the SCO2 Brayton regenerative and recompression cycles are studied optimized for a next-generation solar power tower under maximum cycle temperature of over 700 °C. First, steady-state thermodynamic model is developed validated, impacts different operating parameters on three critical performance indexes, including thermal efficiency, specific work, heat storage difference, analyzed. The results reveal that these indexes influenced by pressures, split ratio, effectiveness regenerators in complex ways. Subsequently, considering as optimization objectives, triple-objective carried out to determine optimal variables with aim obtaining Pareto solutions both cycles. indicates can achieve difference work 396.4 °C 180.6 kW·kg−1, respectively, while reach efficiency 55.95%. Moreover, minimum pressure values found be around 30 MPa 8.2 MPa, respectively. Additionally, distributions regenerator ratio show influences Therefore, should considered performance. When most important index, adopted. Meanwhile, its close 0.7 0.95, or 0.75. from study will helpful superior plants.