Supercritical CO2 Cycle for ICE Waste Heat Recovery

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Supercritical CO2 Cycle for ICE Waste Heat Recovery ( supercritical-co2-cycle-ice-waste-heat-recovery )

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Processes 2020, 8, x FOR PEER REVIEW Processes 2020, 8, x FOR PEER REVIEW 17 of 23 17 of 23 Processes 2020, 8, 216 17 of 23 Figure 22. Exhaust heat recovery ratios for various split ratios and turbine inlet pressures.. Figure 22. Exhaust heat recovery ratios for various split ratios and turbine inlet pressures. 4.4.Split-FlowExpansionS-CO Cycle 2 4.4. Split-Flow Expansion S-CO2 Cycle 4.4. Split-Flow Expansion S-CO2 Cycle ThesameastherecompressionoftheS-CO cycle,theoptimalcyclepressureandtemperature 2 The same as the recompression of the S-CO2 cycle, the optimal cycle pressure and temperature of theThspelista-mfloewasexthpeanrescionmSp-rCeOssiocnycolfetahreSa-lCsoOc2ocnyscilset,etnhtewoipthtimthaelrceycculepeprraetsiosunroefatnhde tSe-mCOpercaytuclre. 22 of the split-flow expansion S-CO2 cycle are also consistent with the recuperation of the S-CO2 cycle. Tohfethrefospreli,t-tfhloewtheexrpmaondsiyonaSm-CicOp2ecryfcolremaarnecaelsioscaonasliystzendtwbaisthedthoenretchuepreersautilotsnobfttahieneSd-CfOro2mcytchle. Therefore, the thermodynamic performance is analyzed based on the results obtained from the rTehceurpeeforartei,onthoef therSm-CodOyncaymcliecinpethrfiosrpmaapnecr.eTihseainaflluyeznedce boafstehde SoRn otnhethreetshueltrsmoabl teaffiinceiedncfryoηm atnhde 2t recuperation of the S-CO2 cycle in this paper. The influence of the SR on the thermal efficiency ηt and erexchuapuesrtahteioantroefctohverSy-CrOat2iocyηcleisinshthoiwsnpainpeFri.gTuhre2in3f.luenceoftheSRonthethermalefficiencyηtand re exhaust heat recovery ratio ηre is shown in Figure 23. exhaust heat recovery ratio ηre is shown in Figure 23. Figure 23. Influence of the split ratio on the thermal efficiency and exhaust heat recovery ratio. Figure 23. Influence of the split ratio on the thermal efficiency and exhaust heat recovery ratio. Figure 23. Influence of the split ratio on the thermal efficiency and exhaust heat recovery ratio. It is found that the changes of ηt and ηre with the SR are the same. Both ηt and ηre increase and It is found that the changes of ηt and ηre with the SR are the same. Both ηt and ηre increase and then decrease with the rising of the SR; there is an optimum SR of 0.43 leading to the highest η and It is found that the changes of ηt and ηre with the SR are the same. Both ηt and ηre increaset and then decrease with the rising of the SR; there is an optimum SR of 0.43 leading to the highest ηt and η . Compared to recuperation of the S-CO cycle, the highest η decreases from 36.05% to 32.99%, threen decrease with the rising of the SR; ther2e is an optimum SR otf 0.43 leading to the highest ηt and ηre. Compared to recuperation of the S-CO2 cycle, the highest ηt decreases from 36.05% to 32.99%, but but the highest η increases from 18.09% to 24.75%. As the same as the recompression of the S-CO ηre.ComparedtorreecuperationoftheS-CO2 cycle,thehighestηt decreasesfrom36.05%to32.99%,bu2t the highest ηre increases from 18.09% to 24.75%. As the same as the recompression of the S-CO2 cycle, cycle, the SR will affect the output power of turbine 2 and the efficiency of the LTR and HTR. So, when the highest ηre increases from 18.09% to 24.75%. As the same as the recompression of the S-CO2 cycle, the SR will affect the output power of turbine 2 and the efficiency of the LTR and HTR. So, when considering heat exchange effectiveness, the calculations about the efficiency of the LTR and HTR must the SR will affect the output power of turbine 2 and the efficiency of the LTR and HTR. So, when considering heat exchange effectiveness, the calculations about the efficiency of the LTR and HTR be checked. So, the curve of η and η have same trend. considering heat exchange eftfectivenreess, the calculations about the efficiency of the LTR and HTR must be checked. So, the curve of ηt and ηre have same trend. must be checked. So, the curve of ηt and ηre have same trend.

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