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Energies 2020, 13, 370 11 of 31 Energies 2020, 13, x 11 of 31 Energies 2020, 13, x 11 of 31 Figure 5. Duallrecuperateds-CO2 ccyccllee.. Figure 5. Dual recuperated s-CO22 cycle. Even tthoughtthediissttiincttffeatturressoffattoppiingandbotttomiingccycclleeccaannoottbbeessttrricicttlylyidideennttififiieed,, Even though the distinct features of a topping and bottoming cycle cannot be strictly identified, ttheduallrecuperated s-CO2ccyclleccanssttiilllbeetthoughttoffaassbbeeiningccoompossedoffttwoeelleemeenttarryBrraytton the dual recuperated s-CO2 cycle can still be thought of as being composed of two elementary Brayton cycllesoperatedbym1andm22..TThheefifirsrsttccyycclele(F(Figiguurree66aa))aacctstsoonnlylyppaarrttiaialllyaassaattooppiingccyccllebecause cycles operated by m1 and m2. The first cycle (Figure 6a) acts only partially as a topping cycle because iitt receiives heatt nott onlly from the externall heatt source in the heater (at the upper temperature)) butt it receives heat not only from the external heat source in the heater (at the upper temperature) but allso ffrom the second ellementary cyclle iin the LTR (at the lower temperature). In addiitiion,, the second also from the second elementary cycle in the LTR (at the lower temperature). In addition, the second ellementtarry cyclle ((Fiigurre 6b)) actts onlly partiiallly as a bottomiing cyclle because,, besiides receiiviing heatt elementary cycle (Figure 6b) acts only partially as a bottoming cycle because, besides receiving heat ffrom the ffiirst cycle in the HTR, it also provides heat to the latter in the LTR. from the first cycle in the HTR, it also provides heat to the latter in the LTR. (a) (b) (a) (b) Figure 6. Decomposition of the dual recuperated s-CO2 cycle into two elementary thermodynamic Figure 6. Decomposition of the dual recuperated s-CO cycle into two elementary thermodynamic Figure 6. Decomposition of the dual recuperated s-CO22 cycle into two elementary thermodynamic cycles: (a) First elementary cycle; (b) Second elementary cycle. cycles: (a) First elementary cycle; (b) Second elementary cycle. cycles: (a) First elementary cycle; (b) Second elementary cycle. IIn Fiigure 6,, ttheheattttrranssfferrffrromttheffiirrssttccyccllettottheesseeccoondccyycclleeisissshhoownnuussininggaavvioiolelettccoololorr, , In Figure 6, the heat transfer from the first cycle to the second cycle is shown using a violet color, lliikeiinttheepprreevvioiouussccaassees,s,wwhhereeraesasththeehehaetatrtarnasnfsefrefrrofrmomthtehseesceocnodncdycyleclteo tohethfiersfitrostneonisesihsoswhonwin like in the previous cases, whereas the heat transfer from the second cycle to the first one is shown in oinraonrgaen.gBeo.tBhothethHeTHRTaRndantdhethLeTLRTRaraereacatcutaulalyllyththeepplalannttccoomppoonneenntstsththaatteenaabblelettheinteractiion orange. Both the HTR and the LTR are actually the plant components that enable the interaction bettween the two elementary cycles and do not act as traditional recuperators. between the two elementary cycles and do not act as traditional recuperators. 2.2. Modeling and Thermodynamic Optimization 2.2. Modeling and Thermodynamic OptimizationPDF Image | Novel Supercritical CO2 Power Cycles for Waste Heat Recovery
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