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was given a pressure of 3 bar (43.5 psia), a temperature of 95 degrees Celsius (203 0F), and a mass flow rate of 62.5 kg/s (137.8 lbm/s).The mass flow rate was originally set to a value that corresponded with 9 MMBTU/hr but then was changed in order to force the cycle to produce the desired power. This was necessary because the flow rate of the refrigerant cannot be increased any other way. Source 6 was given a temperature of 15 degrees Celsius (59 0F), a pressure of 3 bar (43.5 psia), and a mass flow rate of 60 kg/s (132.3 lbm/s). The sinks, apparatuses 9 and 7, do not have anything specified except the pressure from the source. Cycle-Tempo calculates the temperature drop and mass flow into the sinks. The next apparatuses set were the actual components of the ORC. The boiler, which is modeled as a simple heat exchanger, was set to have a pressure of 10 bars on the refrigerant side and a pressure of 3 bars on the waterside. The outlet temperature on the refrigerant side was set to 91.25 degrees Celsius (196.25 0F). The turbine was set to have a pressure of 10 bars and an estimated mechanical efficiency of 80% with an isentropic efficiency of 70%. The generator was specified to have an estimated efficiency of 95%. Cycle-Tempo calculates the actual efficiency of these devices but an initial guess is required to perform the iterations. The condenser was set to have an inlet pressure of 2.79 bars on the refrigerant side and it was specified that the refrigerant would have to a quality of zero when it exits the condenser. Lastly the pump’s operating conditions were set to complete the cycle. The pump was specified to increase the pressure of the refrigerant from 2.79 bars to 10 bars. The outlet temperature of the pump was also specified to be 46.29 degrees Celsius (115.32 0F). Now that the cycle’s state points were set Cycle-Tempo was run and the results were calculated. 46PDF Image | NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.
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