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Energies 2020, 13, 370 20 of 31 Energies 2020, 13, x 20 of 31 Table 5. Thermal efficiency of the two elementary thermodynamic cycles that compose the partial Table 5. Thermal efficiency of the two elementary thermodynamic cycles that compose the partial heatings-CO powercycle. 2 heating s-CO2 power cycle. Parameter Elementary Cycle 1 (Figure 4a) (Figure 4a) Elementary Cycle 2 (Figure 4b) (Figure 4b) Parameter Elementary Cycle 1 Elementary Cycle 2 Heat input from the external heat source (kW) 2377 1496 Heat input from the external heat source (kW) 2377 1496 1215 1215 Figure 12 shows that the net power output is the useful product of a chain of efficiencies. The heat Figure 12 shows that the net power output is the useful product of a chain of efficiencies. The Heat recovered from the exhaust of the first cycle (kW) Heat recovered from the exhaust of the first cycle (kW) - 300 Net power output (kW) 700 25.82 Net power output (kW) 700 25.82 Thermal efficiency of elementary cycles (%) Thermal efficiency of elementary cycles (%) 12.62 - 300 12.62 input from the external heat source is shared between the first and second elementary cycles. While heat input from the external heat source is shared between the first and second elementary cycles. the heat input to the first cycle produces power twice (in its original form in the first cycle and in a While the heat input to the first cycle produces power twice (in its original form in the first cycle and degraded form, degraded in temperature and amount, in the second thermodynamic cycle), the heat in a degraded form, degraded in temperature and amount, in the second thermodynamic cycle), the input to the second cycle produces power once. The thermal efficiency of the second elementary cycle heat input to the second cycle produces power once. The thermal efficiency of the second elementary in the partial heating layout cannot be directly compared against the corresponding efficiency in the cycle in the partial heating layout cannot be directly compared against the corresponding efficiency single flow split with the dual expansion layout because the former benefits from the higher quality in the single flow split with the dual expansion layout because the former benefits from the higher heat input. quality heat input. FFigiguurere1122. .PPaarrtitaiallhheeaatitninggccyycclele..Breakdownoffttheoverralllpeerrfforrmanceiinttoaacchhaaiinooffeeffiffcicieiennccieiess,, wwhhicihchininclculuddeeththeeththeremrmalaleffieffciiceinenciceisesofofththe elelmemenentatrayrycyccylcelse.s. 3.3.DualRecuperateds-CO PowerCycle 2 3.3. Dual Recuperated s-CO2 Power Cycle The trend of the variation of η for the dual recuperated cycle in a wide range of TIT and x The trend of the variation of ηTOT for the dual recuperated cycle in a wide range of TIT and x is TOT ◦ is shown in Figure 13a. The maximum ηTOT is obtained at a TIT = 520 C, which is lower than the shown in Figure 13a. The maximum ηTOT is obtained at a TIT = 520 °C, which is lower than the maximum temperature, and at x = 0.56. A region of high ηTOT is attained in a rather wide range of TIT maximum temperature, and at x = 0.56. A region of high η is attained in a rather wide range of between 450 and 550 ◦ TOT C and a narrow interval of the mass flow fraction x between 0.50 and 0.60. It is TIT between 450 and 550 °C and a narrow interval of the mass flow fraction x between 0.50 and 0.60. It is interesting to note that the region of the highest ηth (Figure 13b) roughly corresponds to thePDF Image | Novel Supercritical CO2 Power Cycles for Waste Heat Recovery
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