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Energies 2020, 13, 370 18 of 31 iEnetrhgeieso2p02p0o,s1i3t,excornerinawideregionroughlyabovethebisectorofFigure10c.Thetrendofη18of3is1 TOT the product of the two opposed metrics according to Equation (2). (a) (b) Figure 10. Variation of the performance metrics with TIT and x for the partial heating cycle: (a) Total (c) Figure 10. Variation of the performance metrics with TIT and x for the partial heating cycle: (a) Total heatrecoveryeffifficiiency;;((b))Cycllettherrmalleffifficciieenccy;;((cc))Heeaattrreeccoovveerryyeefffefecctitviveenneesss.. Tablle 4 shows the values of the performance metrics and cycle parameters at the optimum point andatfoursub-optimumpointsformingarhombusaroundttheopttiimum.. Table 4. Performance metrics and cycle parameters at the optimum and four sub-optimum points for Table 4. Performance metrics and cycle parameters at the optimum and four sub-optimum points for the partial heating cycle. All temperatures are in ◦C. the partial heating cycle. All temperatures are in °C. TITIT x x ηη ηη φφ T2 T3 TT4 TT5 TT7 TOT th 2 3 4 5 TT8 TTinter ToTut 7 8 inter out TOT th 390 0.30 221.16.363 3901 1 0.301 1 2255.8.282 8833.7.77 64.1 227766..0 228800.1.1 272788.9.9 292393.3.3 757.56.6 32382.89.9 11141.41.1 20.05 83.77 64.1 169.1 290.7 227.2 302.6 135.0 277.2 114.1 400 0.50 16.79 20.05 83.77 64.1 169.1 290.7 227.2 302.6 135.0 277.2 114.1 400 0.50 16.79 400 0.10 16.69 26.23 63.62 64.1 225.1 225.1 225.1 302.6 76.1 275.1 231.0 400 0.10 16.69 26.23 63.62 64.1 225.1 225.1 225.1 302.6 76.1 275.1 231.0 500 0.30 16.11 27.46 58.67 64.1 378.7 378.7 378.7 395.3 97.8 428.7 259.7 500 0.30 16.11 27.46 58.67 64.1 378.7 378.7 378.7 395.3 97.8 428.7 259.7 300 0.30 18.02 21.52 83.77 64.1 133.3 185.0 168.3 209.3 71.4 218.3 114.1 21.52 183.77 64.1 133.3 185.0 168.3 209.3 71.4 218.3 114.1 300 0.30 18.02 Optimum values of the decision variables. 1 Optimum values of the decision variables. At the optimum ηTOT, the temperature of the two parallel branches entering the mixing point is almost equal (i.e., T3 ≈ T4), the outlet temperature of the heat source is the minimum allowed, and the exhaust heat at the outlet of the CO2 turbine is fully recovered (T8 → T2).PDF Image | Novel Supercritical CO2 Power Cycles for Waste Heat Recovery
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