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Int. J. Turbomach. Propuls. Power 2020, 5, 19 4 of 17 Equipment Condenser (1) Pump (2) Economizer (3) Turbine (6) 373.00 Regenerator (7) 333.93 1 Table 3. R134a thermodynamic parameters. Temperature 1 Pressure 1 [K] [Pa] 313.00 1012,509 313.00 1012,509 314.11 2624,797 Enthalpy 1 [J/kg] 419,363 256,185 257,590 322,105 428,830 460,255 442,132 Density 1 [kg/m3 ] 49.87 1147.37 1155.48 929.39 154.37 121.11 43.82 Density 1 [kg/m3 ] 13.95 1297.13 1300.84 1038.29 98.34 84.42 11.89 Evaporator (4) 353.00 2624,797 Int. J. Turbomach. Propuls. Power 2019, 4, x FOR PEER REVIEW Superheater (5) 353.00 2624,797 3 of 16 (1) 2624,797 = ⋅, 1012,509 ⋅ Condenser (1) 313.00 Pump (2) 313.00 Economizer (3) 313.55 Evaporator (4) 385.44 Superheater (5) 385.44 Turbine (6) 405.44 Regenerator (7) 354.94 at the inlet of each equipment. Table 4. R245fa thermodynamic parameters. Equipment Temperature 1 [K] Pressure 1 [Pa] 249,412 249,412 1648,462 1648,462 1648,462 1648,462 249,412 Enthalpy 1 [J/kg] 435,245 252,838 253,916 360,253 482,315 509,011 476,033 1 at the inlet of each equipment. Table 5. SES36 thermodynamic parameters. Figure 2. Temperature–entropy diagra1m for the fluids1considered in this1study fluids, in th1e same Equipment Temperature Pressure [Pa] 116,523 Enthalpy [J/kg] 389,772 Density 3 scale as the usual water Mollier diagram. [kg/m ] 8.78 Condenser (1) 313.00 [K] Tables 1–5 present the thermodynamic properties of the considered fluids at the relevant stations Pump (2) 313.00 116,523 233,461 1333.94 in the proEceosnso.mFigzeurr(e3s) 3–7 clear3l1y3.s3h1ow that, in8a5l7l,3o4f1the cycles,2a34r,e0g16enerator rec1o33v5e.r9s9 a portion of Evaporator (4) 386.78 857,341 327,876 1104.87 the sensible heat content of the working fluid before it enters the condenser. The percentage of Superheater (5) 386.78 857,341 442,402 63.85 thermal power recovered by the regenerator amounts to 7.98% of the whole thermal input for the Turbine (6) 406.78 857,341 466,484 56.91 Cyclopentane, 14.50% for the R601, 11.23% for the R134a, 15.99% for the R245fa and 21.42% for the Regenerator (7) 370.35 116,523 439,563 7.21 SES36. Efficiencies and mass flow rates (indicative of expander size) are reported in Table 6. 1 at the inlet of each equipment. Figure 3. Cyclopentane T–S diagram. Figure 3. Cyclopentane T–S diagram. Table 1. Cyclopentane thermodynamic parameters. Equipment Condenser (1) Pump (2) Economizer (3) Evaporator (4) Temperature 1 [K] 313.00 313.00 313.06 353.00 Pressure 1 [Pa] 73,593 73,593 250,885 250,885 Enthalpy 1 [J/kg] 378,072 −18,013 −17,768 61,970 Density 1 [kg/m3] 2.04 725.38 725.52 682.63PDF Image | Optimal Design of a Ljungstrom Turbine for ORC Power
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