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Energies 2020, 13, 370 23 of 31 Energies 2020, 13, x 23 of 31 Table 7. Thermal efficiency of the two elementary thermodynamic cycles that compose the dual Table 7. Thermal efficiency of the two elementary thermodynamic cycles that compose the dual recuperateds-CO powercycle. recuperated s-CO2 2 power cycle. Parameter Elementary Cycle 1 Elementary Cycle 2 Parameter (Figure 6a) (Figure 6a) (Figure 6b) (Figure 6b) Heat input from the external heat source (kW) 3521 - 2905 Heat recovered from the exhaust of cycle 1 (kW) - 634.1 Heat recovered from the exhaust of cycle 1 (kW) - 634.1 Net power output (kW) 365.9 Net power output (kW) 365.9 Thermal efficiency of elementary cycles (%) Thermal efficiency of elementary cycles (%) 18.01 12.60 Elementary Cycle 1 Elementary Cycle 2 Heat input from the external heat source (kW) 3521 - 2905 18.01 12.60 Figure 15 shows that the net power output is the useful product of a chain of efficiencies, where Figure 15 shows that the net power output is the useful product of a chain of efficiencies, where the thermal efficiencies of the elementary thermodynamic cycles play a key role. the thermal efficiencies of the elementary thermodynamic cycles play a key role. Figure 15. Dual recuperated cycle. Breakdown of the overall performance into a chain of efficiencies, Figure 15. Dual recuperated cycle. Breakdown of the overall performance into a chain of efficiencies, which include the thermal efficiencies of the elementary cycles. which include the thermal efficiencies of the elementary cycles. 33.4..4.PPerefroformrmaannceceCCoommppaarirsiosonn TTabalbele8 s8hsohwoswtshethoeptoipmtuimuvmaluveasluoefsthoef dtheecisdieocnisvioarniavbalerisaabnledspaenrdforpmerafnocremmanectreicms feotritchseftohrrethee ◦ s-tChrOee sc-yCcOle2sccyocnlessidceornesdidienrethdisinwthoirskwoobrtkaionbetdaifnoerdafoTr aeTqinueaqlutaol6to00600C°.CT.hTehleaslatsctocloulmumnnininclculuddeses 2 in ththeeoopptitmimuummvvaaluluesesoobbtataininededfoforrththeetrtaradditiitoionnaal lsisningglelererceucuppereartaetdeds-sC-COO22cycyclcel,e,uusesdedaassththeebbaasesleilninee (s(esee[3[366])].).Amongthenovelllalayyoouutsts,,ththeehhigihgehsetsηtη isiaschaciehvievdebdybtyhethsiengsilnegfleowfloswplistpwliithwaitdhual TOT dual expansion cycle, and the lowest by the dual recuperated cycle. Both the single flow split with dual expansion and the partial heating cycles reach the highest φ (dictated by the compressor outlet expansion and the partial heating cycles reach the highest φ (dictated by the compressor outlet temperature and ∆T in the heater), but the η of the former is 0.8% higher than that of the latter. temperature and ΔTmminin in the heater), but the ηth of the former is 0.8% higher than that of the latter. th The dual recuperated cycle shows the lowest φ but the highest η . The dual recuperated cycle shows the lowest φ but the highest η . th TOT expansion cycle, and the lowest by the dual recuperated cycle. Both the single flow split with dual thPDF Image | Novel Supercritical CO2 Power Cycles for Waste Heat Recovery
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