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Energies 2020, 13, 2259 8 of 24 Also, considering the second law of thermodynamics, the exergy efficiency (ηII,ORC−Brayton S−CO2 ) is calculated, as shown in Equation (12) .. in Table 1. . η = EDprod (12) II,ORC−BraytonS−CO2 E.Dfuel where ED f uel and EDprod are the fuel and product exergy rate for the components, which are defined Table 1. Fuel-Product definition for the ORC and Brayton S-CO2 components. Cycle ORC Brayton S-CO2 Equipment Fuel Product ... ITC1 E5 E1AT −E3AT ... P1 WP1 E3AT−E2AT .... ITC2 E1AT −E2AT E1ORC −E4ORC ... Loss - - - T3 E1ORC−E2ORC WT1 ITC3 .- . -. E2A P2 WP2 E4ORC−E3ORC - ... C1 Wcomp E7 − E6 - ... T1 E1 − E2 Wt1 - ... T2 E3 − E4 Wt2 - ... .. RH E8 − E1 + Qs E3 − E2 - .. .. HTR E4 − E5 E8 − E7 - ... . - C1 Wcomp E7 − E6 - Thus, the overall thermal efficiency of the integrated system Brayton S-CO2-ORC is a function of net power and heat source, as shown in Equation (13). .. η I,overall = Wnet,Brayton S−CO2 + Wnet,ORC (13) . QRH 2.4. LCA in the Brayton S-CO2-ORC System The LCA procedure was adopted to investigate the potential environmental impacts of the components and organic fluids of the Brayton S-CO2-ORC in each phase of the life cycle. This procedure is developed according to the ISO 140009 environmental management standards and is supplemented by some steps such as definition, inventory, life cycle impact assessment analysis, results, and interpretation [38]. This analysis was applied in the Barranquilla city (Colombia) in the year 2020. The suggested practical unit is 1 kWh produced by the Brayton S-CO2-ORC system, while the scope of the analysis considers the assembling procedures of materials and divisions of the cycle (construction phase). Also, the operation and maintenance phase was considered as a function of the energy ratio of the equipment. The decommissioning period of the system is likewise considered in the LCA of the thermal system, as shown in Figure 3.PDF Image | S-CO2 Brayton Cycle Coupled with ORC as Bottoming Cycle
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