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Processes 2020, 8, x FOR PEER REVIEW Processes 2020, 8, 216 Figure 15. The optimal exhaust heat recovery ratio for various turbine inlet pressures. Figure 15. The optimal exhaust heat recovery ratio for various turbine inlet pressures. 4.2. Pre-Compression S-CO2 Cycle 13 of 23 13 of 23 4.2. Pre-Compression S-CO2 Cycle Figures 16 and 17 show the thermal efficiency ηt and the exhaust heat recovery ratio ηre of the pre-compressionS-CO cycleforvariousinletpressuresofthePCandMC.η changesbetween37.88% Figures16and127showthethermalefficiencyηtandtheexhaustheattrecoveryratioηreofthe and 38.80%, while η changes between 17.26% and 19.0%. Meanwhile, the MC/PC inlet pressures pre-compression S-rCe O2 cycle for various inlet pressures of the PC and MC. ηt changes between change from 7.5 MPa to 7.9 MPa and 5.6 MPa to 6.8 MPa, respectively. Both η and η increase and then 37.88% and 38.80%, while ηre changes between 17.26% and 19.0%. Meatnwhilree, the MC/PC inlet decrease with the rising of the PC inlet pressure; there is an optimum PC inlet pressure leading to the pressures change from 7.5 MPa to 7.9 MPa and 5.6 MPa to 6.8 MPa, respectively. Both ηt and ηre highest η and η . In the calculation of the net output power, the enthalpy decided by the temperature increaset and thren decrease with the rising of the PC inlet pressure; there is an optimum PC inlet and pressure is the important parameter. So, the net output power is determined by the expansion pressure leading to the highest ηt and ηre. In the calculation of the net output power, the enthalpy power in the turbine and compression power in the PC and MC. However, the changing trend of the decided by the temperature and pressure is the important parameter. So, the net output power is expansion power is different from that of the compression expansion power, so there is a peak value of determined by the expansion power in the turbine and compression power in the PC and MC. net output power. Meanwhile, the inlet pressure of the MC is also an important influencing factor of However, the changing trend of the expansion power is different from that of the compression cycle performance, which is same as the influence of the compressor inlet pressure on recuperation of expansion power, so there is a peak value of net output power. Meanwhile, the inlet pressure of the theS-CO cycle.TheoptimumPCinletpressureisdecidedbytheMCinletpressure.Theinfluenceof MC is al2so an important influencing factor of cycle performance, which is same as the influence of Processes 2020, 8, x FOR PEER REVIEW 14 of 23 the MC inlet pressure on η and η follows the results of recuperation of the S-CO cycle. the compressor inlet presst ure onrerecuperation of the S-CO2 cycle. The optimum 2PC inlet pressure is decided by the MC inlet pressure. The influence of the MC inlet pressure on ηt and ηre follows the results of recuperation of the S-CO2 cycle. Figure 16. Thermal efficiency for various inlet pressures of the PC and MC. Figure 16. Thermal efficiency for various inlet pressures of the PC and MC.PDF Image | Supercritical CO2 Cycle for ICE Waste Heat Recovery
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