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Table 7. Performance of ORC with Recuperation and Reheat using Mixed Working Fluids Working Fluid composition ic4/ic6 (17/83) ic4/ic6 (19/81) ic4/ic6 (30/70) ic4/c5 (5/95) c5/ic6 (81/19) c5/c7 (50/50) Efficiency Gross Parasitic Electricity(kWe) (kWe) 19.5 1,030 102 19.2 1,022 109 18.8 976 98 20.7 1,157 124 18.7 950 104 18.8 976 94 HTF Flow HTF outlet (lbm/hr) Temp. (°F) 138,644 430 142,012 434 132,076 425 129,026 410 138,296 438 139,128 433 The heating and cooling curves for this case are shown in Figures 14 and 15. The state points have been listed in Table 8. Comparison between the results obtained for pure components versus mixed working fluids indicate that the efficiency of the cycle with mixed working fluid is only slightly higher than that for a pure component. However, as explained earlier, the impact of using mixed working fluids will be more pronounced when using partial load conditions of the solar field. Temperature F Pressure psi Vapor Frac Mole Flow Mass Flow Volume Flow cuft/hr Enthalpy MMBtu/hr -5.56E+01 1.04E+02 2.00E+01 0.00E+00 9.26E+02 6.60E+04 1.76E+03 -6.77E+01 0.00E+00 0.00E+00 3.30E+03 6.27E+04 8.00E+01 1.47E+01 1.00E+00 6.64E+04 1.92E+06 2.62E+07 1.38E+00 1.92E+06 0.00E+00 0.00E+00 0.00E+00 1.07E+02 1.47E+01 1.00E+00 6.64E+04 1.92E+06 2.74E+07 1.36E+01 1.92E+06 0.00E+00 0.00E+00 0.00E+00 5.80E+02 5.00E+03 0.00E+00 1.01E+03 1.29E+05 5.43E+03 -7.54E+01 0.00E+00 1.29E+05 0.00E+00 0.00E+00 4.10E+02 5.00E+03 0.00E+00 1.01E+03 1.29E+05 3.82E+03 -9.11E+01 0.00E+00 1.29E+05 0.00E+00 0.00E+00 1.04E+02 2.00E+01 0.00E+00 9.26E+02 6.60E+04 1.76E+03 -6.77E+01 0.00E+00 0.00E+00 3.30E+03 6.27E+04 1.09E+02 6.25E+02 0.00E+00 9.26E+02 6.60E+04 1.77E+03 -6.74E+01 0.00E+00 0.00E+00 3.30E+03 6.27E+04 3.43E+02 6.10E+02 0.00E+00 9.26E+02 6.60E+04 2.67E+03 -5.68E+01 0.00E+00 0.00E+00 3.30E+03 6.27E+04 5.30E+02 3.30E+02 1.00E+00 9.26E+02 6.60E+04 2.58E+04 -4.33E+01 0.00E+00 0.00E+00 3.30E+03 6.27E+04 4.67E+02 2.40E+01 1.00E+00 9.26E+02 6.60E+04 3.79E+05 -4.50E+01 0.00E+00 0.00E+00 3.30E+03 6.27E+04 Mass Flow AIR OIL ISO-BUT N-PEN-01 lb/hr lbmol/hr lb/hr 1.70E+02 2.20E+01 1.00E+00 9.26E+02 6.60E+04 2.73E+05 Table 8. State Points for the ORC with Reheat and Recuperation using Mixed Working Fluid ACC-IN ACC-OUT AIR-IN AIR-OUT B-IN B-OUT LIQ-1 LIQ-2 LIQ-3 RH-1 TURB-OUT VAP-1 5.63E+02 6.00E+02 1.00E+00 9.26E+02 6.60E+04 1.34E+04 -4.26E+01 0.00E+00 0.00E+00 3.30E+03 6.27E+04 VAP-2 5.63E+02 3.20E+02 1.00E+00 9.26E+02 6.60E+04 2.82E+04 -4.17E+01 0.00E+00 0.00E+00 3.30E+03 6.27E+04 0.00E+00 0.00E+00 3.30E+03 6.27E+04 19PDF Image | Modular Trough Power Plant Cycle and Systems Analysis
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