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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analysis was then carried out for each fluid where the boiler pressure and temperature was varied multiple times. The temperatures investigated were the saturation temperature at the given pressure, the saturation temperature plus five degrees, and the saturation temperature plus ten degrees. For the next iterations the temperature was set to the saturation temperature and the assumed power was varied from 150, to 250, to 300, to 500 kW. The last iterations were looking at the effect of mass flow rate on the thermal efficiency. This was done by setting the boiler temperature to the saturation temperature and decreasing the value of the mass flow rate. It was attempted to increase the flow rate as well but many problems occurred when this happened. Figure 2.2 below shows the effect of the variation of maximum temperature on the thermal efficiency of a theoretical ORC using R-245fa as the working fluid. 210 200 190 180 170 160 150 140 192.47 187.47 Effect of Temperature Variation on Thermal Efficiency (R-245fa) P = 150 Psia 157.03 P = 125 Psia P = 100 Psia P = 75 Psia 206.25 201.25 196.25 152.03 176.43 147.03 171.43 182.47 166.43 4 5 6 7 8 9 10 Thermal Efficiency (%) Figure 2.2: Temperature Variation on Thermal Efficiency (R-245fa) 30 Maximum Temperature (0F)

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