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Advanced Performance of a CO2 Energy Storage Based Trigen

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Advanced Performance of a CO2 Energy Storage Based Trigen ( advanced-performance-co2-energy-storage-based-trigen )

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Appl. Sci. 2020, 10, 8341 5 of 17 The specific exergy ej is separated deeply into its thermal and mechanical exergy [40]: ej = ePH = eτ + eM jjj =􏱅􏱃h −h 􏱄−τ􏱃s −s 􏱄􏱆 +􏱅􏱃h −h 􏱄−τ􏱃s −s 􏱄􏱆 (13) where the node X is at the pressure p and ambient temperature τ0. Here, thermal exergy is mainly due to the temperature, and mechanical exergy mainly due to the pressure. The “fuel-product” definition is applied for exergy in the present analysis. At component level, the exergy balance can be expressed as [33]: ... EF,k = EP,k + ED,k (14) and the exergy balance for overall system is: ..􏲖.. EF,tot = EP,tot + ED,k + EL,tot (15) ... where EP,k and EF,k stands for product and fuel exergy, respectively. EL,tot is the exergy that will not . be used further in the system. It is noteworthy that EL,tot is considered merely for the overall system rather than for a specific component. The following definitions are introduced to assess the exergy conversion rate in the conventional exergy analysis [31–33]: j j,X 0 j j,X p=const j,X j,0 0 j,X j,0 τ0=const Exergy efficiency of a component: The system exergy efficiency: The ratio of exergy destruction: D,tot The relative exergy destruction: k E. ε . = EP,tot × 100% (17) . ε = EP,k ×100% (16) k. EF,k tot . EF,tot . y = ED,k k. EF,tot × 100% (18) . y∗ = ED,k × 100% (19) In Table 1, the fuel and product exergy is listed by referring to [35,40].

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