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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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turbine and is connected by a shaft to the generator, which is the symbol with the ā€œGā€ on it. Apparatus number two is the boiler, which is modeled as a heat exchanger with a constant heat input from hot water. Apparatus number one is the pump and apparatus number four is the condenser that is modeled with a constant cooling input from a water tank. The symbols that are circles, numbers 6, 7, 8, and 9, are heat sources and sinks. Heat source eight is modeled as the waste heat source which has a constant specified temperature and a specified mass flow rate. Heat sink six is modeled as the cooling water source, in this case a water tank at a constant specified temperature and a constant specified mass flow rate. Heat sinks nine and seven are used as outlets for the cooling/heating water. In reality the heating and cooling water for the ORC are contained in their own loops and do not have two heat sinks. The water is usually contained in a tank and just re-circulated throughout the loop but since the analysis and modeling was to investigate the ORC and not the sources of cooling or heating they were modeled as simple heat sources and sinks. In order to accurately model the 300 kW cycle analyzed earlier the temperatures and pressures used in the theoretical analysis were input to Cycle-Tempo in the following order. First the model was constructed and the apparatuses were connected with pipes containing the desired working fluid, R-245fa. Next the conditions in each apparatus were specified as close as possible to the theoretical values. The first conditions set were those for the heat sinks/sources. It was assumed that the pressure for the heat/cooling sources was 3 bar. This was chosen at random and has almost no effect on the operation/performance of the cycle. In order to model the 9 MMBTU/hr of heat input at 200 degrees Fahrenheit, heat source eight 45

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