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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 results for the recuperator cycle are very similar to those found earlier for the standard ORC. The main changes are that the mass flow rate was increased from 12.9 kg/s to 13.5 kg/s. This increased flow rate explains why the pump consumed more power in this analysis than the previous one. The other main difference is that the recuperator cycle has an added component which increases the temperature at state 2 by 10 degrees Celsius and decreases the temperature at state 4 by 10 degrees Celsius. It is assumed that this heat exchanger is 100% efficient since the 10-degree temperature difference is lost by one stream and recovered by the other stream. The efficiencies of each apparatus were the same as the previous calculation as well. The turbine was found to be 88% efficient, the pump was 86% efficient, and the generator was found to be 99% efficient. Table 2.12 below shows the heat exchanging equipment heat flow rates. Table 2.12: Heat Exchanging Equipment for Recuperator Heat Exchanging Equipment App. Name Low end temperature diff. High end temperature diff. Transmitted heat flow no. [K] 4 Condenser 3 Heat Exchgr. 2 Heat Exchgr. [K] [kW] 2510.64 186.01 2674.03 28.3 2.62 28.53 18.3 2.62 3.75 In the table above the heat exchanger number 3 corresponds to the recuperator and the heat exchanger number 2 corresponds to the boiler. The heat transfer rate for the condenser is the same as the heat transfer for the previous cycle which is expected since the temperature 57

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