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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 cycles were analyzed isentropically the thermal efficiencies and energy balances were compared to the completely theoretical results found earlier. It was found that the addition of the isentropic efficiencies of the pump and the turbine did not affect the trends exhibited in the ideal graphs. The only thing affected were the values of the thermal efficiency, work output, work input, heat input, and heat output. On average the thermal efficiency was decreased by about 30.7%. This is the same amount that the efficiency of the turbine was decreased by which means that thermal efficiency and isentropic efficiency of the turbine have a linear relationship. On average it was found that the work output and input were increased by exactly 30%. This means that the work output is proportional with the isentropic efficiency of the turbine. This also holds true for the work input since it is proportional to the work output. The heat input was found to increase by an average value of 1.15% whereas the heat output was found to increase by an average value of about 3.37%. It was also found that the isentropic efficiency had more of an effect on the cycle at higher pressures. The isentropic efficiency was also found to have the same effect on the energy balance of the cycle at different boiler temperatures. This means that the isentropic efficiency of the turbine and pump are a stronger function of pressure than temperature. This can be verified since the enthalpy of a fluid is a stronger function of pressure than temperature. It was also found that varying the fluid had little effect on the changes in thermal efficiency. This is thought to be true since the decrease in work output is based on the percentage decrease in isentropic efficiency and not on each fluid specifically. 37

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