Advanced exergy and advanced exergoeconomic analyses of the partial heating supercritical CO₂ power cycle for waste heat recovery

In this study, the partial heating supercritical CO₂ power cycle for waste heat recovery is investigated to understand more about the true potential of thermodynamic and economic performance improvement of each system component, as well as a more profound comprehension of the simultaneous interactions between the system components using advanced exergy and advanced exergoeconomics analysis. In addition, the affirmative or nugatory impact of the inefficiency of each component on the exogenous exergy destruction and exogenous costs in other system components separately, as well as the effect of the inefficiency combination of other components on the desired component (mexogenous effect) have been determined. The results demonstrated that according to the technological constraints in the system, the maximum exergy efficiency that can be achieved is 59.8%, and 38.4% (926.9 kW) of the total exergy destruction and 46.18% (32.52 \(\mathrm{\$ }\,{{\text{h}}}^{-1}\) $\mathrm{\$}{\text{h}}^{-1}$ ) of the total exergy destruction cost of the system is avoidable. According to the mexogenous exergy destruction, the simultaneous interplay among other system components affects the turbine performance most. The priority of improving the components based on the highest avoidable endogenous exergy destruction cost is related to the turbine, cooler, and compressor. The results of this study revealed that 97.8% (79.73 \(\mathrm{\$ }\,{{\text{h}}}^{-1}\) $\mathrm{\$}{\text{h}}^{-1}$ ) of the system's total cost is relevant to the endogenous part, which shows that the cost caused by the interaction among the components is very small. The turbine and compressor have the most significant cost-saving potential, while the heaters have the lowest.