Novel Supercritical CO2 Power Cycles for Waste Heat Recovery

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Novel Supercritical CO2 Power Cycles for Waste Heat Recovery ( novel-supercritical-co2-power-cycles-waste-heat-recovery )

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Energies 2020, 13, 370 21 of 31 Energies 2020, 13, x 21 of 31 interesting to note that the region of the highest ηth (Figure 13b) roughly corresponds to the region of region of the lowest φ (Figure 13c), which still remains above 65.5%. The overall effect is the extension the lowest φ (Figure 13c), which still remains above 65.5%. The overall effect is the extension of the of the high ηTOT region to wider intervals of TIT and x than those maximizing ηth. high ηTOT region to wider intervals of TIT and x than those maximizing ηth. (a) (b) Figure 13. Variation of the performance metrics with TIT and x for the dual recuperated cycle: (a) (c) Figure 13. Variation of the performance metrics with TIT and x for the dual recuperated cycle: (a) Total Total heat recovery efficiency; (b) cycle thermal efficiency; (c) heat recovery effectiveness. heat recovery efficiency; (b) cycle thermal efficiency; (c) heat recovery effectiveness. Table 6 shows the values of the performance metrics and cycle parameters at the optimum point Table 6 shows the values of the performance metrics and cycle parameters at the optimum point and at four sub-optimum points forming a rectangle just to the left of the optimum. and at four sub-optimum points forming a rectangle just to the left of the optimum. Table 6. Performance metrics and cycle parameters at the optimum and four sub-optimum points for Table 6. Performance metrics and cycle parameters at the optimum and four sub-optimum points for TIT1 x1 ηTOT ηth φ T2 T3 T5 T6 T7 T8 T9 T10 Tout 520 0.56 19.39 28.40 68.27 64.1 154.0 413.7 81.6 380.4 284.4 75.2 78.7 204 11 520500 0.05.640 169..7379 218..3480 7688..4237 646.41.1 951.514.0 39451.3.7 808.71.6 1863.870.41032.824.466.175.271.778.7145.1204 the dual recuperated cycle. All temperatures are in °C. the dual recuperated cycle. All temperatures are in ◦C. TIT x ηTOT ηth φ T2 T3 T5 T6 T7 T8 T9 T10 Tout 500 0.40 16.77 21.38 78.43 64.1 95.1 395.3 80.7 186.7 103.2 66.1 71.7 145.1 500 0.70 15.45 20.20 76.51 64.1 106.3 395.3 210.3 378.7 282.8 75.1 166.8 156.3 500 0.70 15.45 20.20 76.51 64.1 106.3 395.3 210.3 378.7 282.8 75.1 166.8 156.3 400 0.40 14.26 17.05 83.63 64.1 65.0 302.6 76.1 143.9 65.0 64.2 68.8 115.0 400 0.40 14.26 17.05 83.63 64.1 65.0 302.6 76.1 143.9 65.0 64.2 68.8 115.0 400 0.70 15.07 19.03 79.20 64.1 90.7 302.6 158.2 290.7 200.6 71.0 129.8 140.7 400 0.70 15.07 19.03 79.20 64.1 90.7 302.6 158.2 290.7 200.6 71.0 129.8 140.7 1 Optimum values of the decision variables. 1 Optimum values of the decision variables.

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