NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications.

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NESTER, RYAN TIMOTHY. Organic Rankine Cycles: A Comparative Study and Analysis of Multiple Applications. ( nester-ryan-timothy-organic-rankine-cycles-comparative-study )

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The table above shows the data for each pipe within the cycle. There are two rows for each pipe, the first row corresponds to the inlet of that pipe and the second row is the outlet of the pipe. The fluid called StanMix one is really R-245fa but it is found in the StanMix library which is why that title is displayed. No loses in the pipes were calculated since the values on the inlet rows are the same as the values on the outlet rows. The values of temperature, pressure, and enthalpy appear to be similar to those of the ideal cycle but the biggest difference between the ideal and actual cycles is the flow rate that Cycle-Tempo calculated. The ideal cycle had a mass flow rate of about 27 kg/s whereas the Cycle-Tempo flow rate was about 13 kg/s. Since the flow rate of the refrigerant is about half of the ideal value and cannot be changed the flow rate of the water for cooling and heating had to be increased to its value of 60 kg/s in order to force the cycle to produce the desired amount of power. Even though the flow rate of the Cycle-Tempo cycle is half of the ideal value the flow rate of the heating and cooling water had to be about 10 times greater than desired flow rate for 9 MMBTU/hr. The efficiencies of the pump, generator, and turbine were calculated to be 88%, 99%, and 86% respectively. The pump and turbine efficiencies seem to be reasonable but the generator efficiency seems to be high. Not sure why this is or how to force Cycle-Tempo to lower this. The estimated efficiency of the generator was changed multiple times but had no effect on decreasing the calculated efficiency of the generator. The last results calculated by Cycle- Tempo are those for the heat exchanging equipment and can be seen below in Table 2.8. 50

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