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The R245fa ORC system needs a heat input of 534.6 kW to produce 75 kW of power out at turbine shaft, with R245fa mass flow rate of 2.13 kg/sec through the turbine and a pressure ratio of 10.45 across the turbine. After taking into account all the system related parasitic losses the power available for export to the grid is around 57.5 kW. The system Carnot efficiency is 23.74 %. While the thermal efficiency based on shaft power is 14.0 %, the efficiency of the system drops by 23% after taking into account the parasitic losses from pump, condenser fans and generator electrical conversion. This results in a net system heat to power output conversion of 10.8 %. 3. R1233zd AS DROP IN FOR R245fa R1233zd being a lower pressure fluid compared to R245fa, helps in using a higher saturation temperature at design pressure. While using the same design condenser saturation temperature used for the R245fa based system, results in a higher Carnot efficiency compared to a R245fa system. This could indicate a higher net thermal efficiency of an R1233zd system compared to R245fa if the parasitic pump losses and system irreversibility’s are comparable to the R245fa based ORC system. Figure 6 below shows the basic schematic for an ORC system and the Figures 7 and 8 represent the R245fa based organic Rankine cycle in a Temperature-Entropy (T-s) and Pressure-Enthalpy (P-h) diagrams Heat Input = 528.4 kW T = 135.0 ̊ C P = 2000.0 kPa (a) Evaporator Shaft Output = 80.4 kW Generator Output = 74.0 kW Turbine Generator R1233ZD Pump Input = 6.0 kW Pump Figure 6: Schematic of the R1233zd based ORC system respectively Heat Rejected = 459.7 kW T= 30.0 ̊C P = 154.4 kPa (a) Condenser Fan Input = 5.5 kW 2546, Page 4 Figure 7: T-s diagram for R1233zd ORC cycle Figure 8: P-h diagram for R1233zd ORC cycle 15th International Refrigeration and Air Conditioning Conference at Purdue, July 14-17, 2014PDF Image | Comparing R1233zd and R245fa for Low Temperature ORC Applications
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