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Energies 2020, 13, 2259 20 of 24 Pts, respectively. The T1 and T2 turbines obtained a percentage value of 18.19% and 25.78% of the total environmental impact with cyclohexane, 20.54%, and 29.10% with toluene, 20.36% and 28.85% with acetone. Also, the ITC1 in the ORC cycle is the component with the greatest environmental impact, with a percentage value of 10.67% (cyclohexane), 12.05% (toluene) and 11.94% (acetone). In general, the environmental impacts of the components with steel are lower than those of the components with copper, because the methodology applied suggests a higher Eco99 coefficient than steel. Therefore, through this methodology, the organic working fluid and the material in which the most significant opportunities for improvement are found can be selected to obtain the smallest environmental impact. Among the organic fluids studied, acetone has lower potential environmental impacts than cyclohexane and toluene, which is a consequence of the Eco99 coefficient. However, some safety and health consideration such be considered to implement the ORC alternative industrially as the bottoming system from the Brayton cycle. Finally, this study allows for evaluating the performance of the combined cycles for applying this technology in industries for generating energy and net power. Acetone is the fluid with the best thermodynamic and environmental performance results on this configuration because of their thermal properties, giving an option for other studies to proposed an eco-design of this and obtain better exergy and environmental results according to other performance parameters. Author Contributions: Conceptualization: E.E.B.; Methodology: G.V.O. and J.D.F.; Software: E.E.B., G.V.O., and J.D.F.; Validation: E.E.B., and J.D.F.; Formal Analysis: E.E.B., G.V.O., and J.D.F.; Investigation: E.E.B., G.V.O., and J.D.F.; Resources: G.V.O. and J.D.F.; Writing—Original Draft Preparation: G.V.O.; Writing—Review and Editing: G.V.O. and J.D.F.; Funding Acquisition: G.V.O., and J.D.F. All authors have read and agreed to the published version of the manuscript. Funding: This work was supported by the Universidad del Atlántico, and Universidad Francisco de Paula Santander in Ocaña - Norte de Santander. Acknowledgments: This research was supported by the Mechanical Engineering Program of Universidad del Atlántico. The Kai Research Group supports G. Valencia and J. Duarte. Conflicts of Interest: The authors declare no conflict of interest. Nomenclature LCA Life Cycle Assessment ORC Organic Rankine Cycle . Q Heat rate [kW] . W Power [kW] m. Mass flow rate [kW] h Enthalpy [kJ/kg·K] s Specific entropy [kJ/kg·K] ex Exergy rate . ED Exergy destruction rate η Efficiency M Mass [kg] A Area [m] δ Thickness [m] CFT Correction Factor Yi Environmental Impact [mPts] Co Construction Om Operation De decommissioning Wf Working fluid PPE Pinch Point of EvaporatorPDF Image | S-CO2 Brayton Cycle Coupled with ORC as Bottoming Cycle
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