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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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should be used in higher temperature situations or applications that require a lot of heat to be delivered to a source. The main advantage of using a dry fluid is that a recuperator heat exchanger can be used in the cycle to take the energy left in the superheated vapor at the exit of the turbine and use it to preheat the fluid entering the evaporator. The use of a recuperator increases the overall thermal efficiency of the cycle and reduces the amount of heat input and output to and from the cycle. Turbines are easily damaged by moisture contained in the vapor that is expanded in the turbine. Dry fluids cause less damage on turbines, compared to wet fluids, since they are superheated throughout the expansion within the turbine. This is a great advantage to dry fluids since the wear and tear on the turbine is less which yields and overall longer life of the turbine. An isentropic fluid is very efficient at recovering low temperature waste heat and may be the best choice of working fluid depending on whether a recuperator is desired. Isentropic fluids have a lower critical temperature than wet fluids which makes them more efficient at recovering low temperature waste heat than wet fluids. The overall area within the saturation dome is greater for an isentropic fluid than a dry fluid. This means that the maximum work achievable by a cycle using an isentropic fluid is greater than that of a dry fluid. The choice of the working fluid greatly affects the thermal efficiency of the ORC. According to a study done by T.C. Hung et al, the efficiency of the cycle is closely related to the latent heat of the fluid at low pressure; a greater latent heat at low pressure yields a lower efficiency since a larger portion of the energy carried by the fluid is rejected via the condenser. The efficiency 18

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