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Processes 2020, 8, 216 18 of 23 Processes 2020, 8, x FOR PEER REVIEW 18 of 23 Figure 24 shows the exhaust heat recovery ratios ηre for various split ratios and turbine inlet Figure 24 shows the exhaust heat recovery ratios ηre for various split ratios and turbine inlet pressures. The effect of the SR on ηre for different turbine inlet pressures is the same; the ηre achieves a pressures. The effect of the SR on ηre for different turbine inlet pressures is the same; the ηre achieves a maximum while the SR is 0.43. maximum while the SR is 0.43. Figure 24. Influence of split ratios on the exhaust heat recovery ratios for various turbine inlet pressures. Figure 24. Influence of split ratios on the exhaust heat recovery ratios for various turbine inlet 4.5. Performance Comparison of Various S-CO2 Cycle Layouts pressures. Different S-CO2 cycle layouts will lead to different cycle thermodynamic performances. The cycle therm4.a5l.PeffierfcoiremnacnycaenCdomepxahraisuosntohfeVaatriroeucsovSe-CryO2raCtyiocsleoLfayvoaurtisousS-CO2cyclelayoutsatrespective optimal operation parameters are compared in Figure 25. It is shown obviously that the efficiency Different S-CO2 cycle layouts will lead to different cycle thermodynamic performances. The and exhaust heat recovery ratios of four different S-CO2 cycles have great differences with each other. cycle thermal efficiency and exhaust heat recovery ratios of various S-CO2 cycle layouts at respective For recuperation of the S-CO2 cycle, the highest ηt and ηre are 36.05% and 18.12%. For pre-compression optimal operation parameters are compared in Figure 25. It is shown obviously that the efficiency of the S-CO2 cycle, the highest ηt and ηre are 38.8% and 19.0%. Compared to recuperation of the S-CO2 and exhaust heat recovery ratios of four different S-CO2 cycles have great differences with each cycle, the PC can add the compression work, but the LTR and HTR can improve the inlet enthalpy of the other. For recuperation of the S-CO2 cycle, the highest ηt and ηre are 36.05% and 18.12%. For heater and the outlet enthalpy of the turbine. So, ηt and ηre both improve. For split-flow recompression pre-compression of the S-CO2 cycle, the highest ηt and ηre are 38.8% and 19.0%. Compared to of the S-CO2 cycle, the highest ηt and ηre are 43.16% and 18.0%. For split-flow expansion of the S-CO2 recuperation of the S-CO2 cycle, the PC can add the compression work, but the LTR and HTR can cycle, the highest ηt and ηre are 32.99% and 24.75%. Compared to recompression of the S-CO2 cycle, improve the inlet enthalpy of the heater and the outlet enthalpy of the turbine. So, ηt and ηre both two turbines provide higher net output powers. improve. For split-flow recompression of the S-CO2 cycle, the highest ηt and ηre are 43.16% and 18.0%. For split-flow expansion of the S-CO2 cycle, the highest ηt and ηre are 32.99% and 24.75%. Compared to recompression of the S-CO2 cycle, two turbines provide higher net output powers.PDF Image | Supercritical CO2 Cycle for ICE Waste Heat Recovery
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