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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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and was found to have a thermal efficiency of about 9.8%. The work input was found to be 0.14 MMBTU/hr and the heat rejected was found to be 8.12 MMBTU/hr. The Cycle-Tempo analysis showed that the cycle could produce about 260 kW, had a mass flow rate of about 13 kg/s, had a heat input of 9.3 MMBTU/hr, a thermal efficiency of about 7.8%. The work input was found to be 0.2 MMBTU/hr and the heat rejected was found to be about 8.5 MMBTU/hr. The thermal efficiency of the cycle is lower since the cycle is not treated as an ideal cycle. In order to attempt to push the cycle toward its ideal limits a recuperator heat exchanger was added to the cycle. The recuperator heat exchanger is added between the pump and the boiler and is used to take some of the heat out of the refrigerant before it is sent to the condenser and use this heat to preheat the refrigerant before it enters the boiler. The recuperator should increase the efficiency of the cycle but it also increases the cost of the ORC. Figure 2.12 below shows the Cycle-Tempo model of an ORC with a recuperator heat exchanger. 52

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