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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Overall using isentropic efficiencies an ORC is only about 6 to 8% efficient. This seems terribly low for a power producing apparatus, but since the cycle is designed to convert waste heat into electricity all of the power is essentially free power that would otherwise be wasted into the atmosphere. An analysis was also performed on a theoretical cycle again to plot the T-s diagrams of the system for three different fluids. To calculate the state points for the cycle three assumptions were made; the boiler pressure was assumed, the boiler temperature was set to 200 ̊F because that would be the maximum theoretical temperature available, and the condenser pressure was assumed. Since the boiler pressure and temperature were assumed the remaining properties for state three could be calculated. Next the properties at state one were calculated by setting the pressure in the condenser and specifying that the fluid would be completely condensed liquid. Now that two the pressure and quality were known the remaining properties for state one could be calculated. The work input of the cycle was calculated through the following equation. (2.13) In equation 2.13; win is the work input required by the pump, ρ is the density of the fluid, P3 is the boiler pressure, and P1 is the condenser pressure. This analysis was performed on a mass basis and the units are in BTU/lb. The remaining properties were determined by using the ideal cycle assumption of constant pressure heat addition/rejection and isentropic compression/expansion. Therefore the 38

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