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Int. J. Turbomach. Propuls. Power 2019, 4, x FOR PEER REVIEW Int. J. Turbomach. Propuls. Power 2020, 5, 19 ⋅ Figure 2. Temperature–entropy diagram for the fluids considered in this study fluids, in the same scale Figure 2. Temperature–entropy diagram for the fluids considered in this study fluids, in the same Tables 1–5 present the thermodynamic properties of the considered fluids at the relevant stations in the process. Figures 3–7 clearly show that, in all of the cycles, a regenerator recovers a portion of the in the process. Figures 3–7 clearly show that, in all of the cycles, a regenerator recovers a portion of sensible heat content of the working fluid before it enters the condenser. The percentage of thermal the sensible heat content of the working fluid before it enters the condenser. The percentage of power recovered by the regenerator amounts to 7.98% of the whole thermal input for the Cyclopentane, thermal power recovered by the regenerator amounts to 7.98% of the whole thermal input for the 14.50% for the R601, 11.23% for the R134a, 15.99% for the R245fa and 21.42% for the SES36. Efficiencies Cyclopentane, 14.50% for the R601, 11.23% for the R134a, 15.99% for the R245fa and 21.42% for the and mass flow rates (indicative of expander size) are reported in Table 6. scale as the usual water Mollier diagram. = ⋅ , 3 of 16 3 of 17 ( 1 ) as the usual water Mollier diagram. Tables 1–5 present the thermodynamic properties of the considered fluids at the relevant stations SES36. Efficiencies and mass flow rates (indicative of expander size) are reported in Table 6. Table 1. Cyclopentane thermodynamic parameters. Equipment Condenser (1) Pump (2) Economizer (3) Evaporator (4) Superheater (5) Turbine (6) Regenerator (7) Equipment Condenser (1) Pump (2) Economizer (3) Temperature 1 [K] 313.00 313.00 313.06 353.00 353.00 373.00 341.04 Pressure 1 [Pa] 73,593 73,593 250,885 250,885 250,885 250,885 73,593 Enthalpy 1 [J/kg] 378,072 −18,013 −17,768 61,970 426,794 458,217 416,033 Density 1 [kg/m3 ] 2.04 725.38 725.52 682.63 6.43 6.01 1.86 1 at the inlet of each equipment. Table 2. R601 thermodynamic parameters. 1111 TempFeirgauturere3. CyclopPerenstasunreeT–S diagraEmnt.halpy [K] [Pa] [J/kg] Density [kg/m3 ] 3.35 605.85 Evaporator (4) 353.00 [Pa] [J/kg] [kg/m3] Superheater (5) 353.00 366,619 427,177 Equipment 313.09 366,619 9425 606.13 Condenser (1) 313.00 73,593 378,072 2.04 725.38 725.52 682.63 Turbine (6) 373.00 366,619 468,490 9.35 2.96 Regenerator (7) 348.94 115,093 430,071 Pump (2) 313.00 73,593 −18,013 Economizer (3) Evaporator (4) Superheater (5) Turbine (6) Regenerator (7) 313.06 250,885 −17,768 61,970 Table 1. Cyclopentane thermodynamic parameters. 313.00 313.00 [K] 115,093 115,093 363,518 9010 Temperature 1 Pressure 1 Enthalpy 1 Density 1 366,619 108,917 562.19 10.11 1 at the inlet of each equipment. 353.00 250,885 353.00 250,885 373.00 250,885 341.04 73,593 426,794 6.43 458,217 6.01 416,033 1.86 1 at the inlet of each equipment.PDF Image | Optimal Design of a Ljungstrom Turbine for ORC Power
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