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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App. no. 4 2 Name Condenser Heat Exchgr. Low end temp diff. [K] 28.3 38.34 High end temp diff. [K] 18.3 3.75 Transmitted heat flow [kW] 2510.64 2722.71 Table 2.8: Heat Exchanging Equipment Heat Exchanging Equipment The temperature differences on the condenser and boiler, a.k.a. heat exchanger, correspond to the values calculated in the ideal analysis. The low end of each apparatus corresponds to the refrigerant side of the heat exchangers and the high end corresponds to the waterside. The transmitted heat flow for the condenser was calculated to be about 2510 kW whereas the calculated value of the heat rejected in the ideal cycle was approximately 2380 kW. This difference in values corresponds to about a 5% difference. The values should be very close to each other and the difference is assumed to be the fact that two different programs were used to evaluate the properties of the working fluid and these two programs might slightly differ in enthalpy values. The heat flow is calculated only on the enthalpy values of the refrigerant and does not take into account the flow rate from the heat sinks/sources. The heat input flow was calculated to be about 2722 kW in Cycle-Tempo and was found to be 2637 kW in the ideal analysis. This difference is about 3% increase in the heat input. This again is assumed to be due to the fact that two programs were used to evaluate the properties and their values might be based off of different reference points. The ideal theoretical analysis of the ORC modeled in Cycle-Tempo was assumed to produce 300 kW of electricity, had a mass flow rate of 27.8 lbm/s, had a heat input of 9 MMBTU/hr, 51

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