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Analysis of optimization in an OTEC plant using ORC

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Analysis of optimization in an OTEC plant using ORC ( analysis-optimization-an-otec-plant-using-orc )

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warm-seawater inlet temperature on DTw,o for an OTEC plant with an ORC cycle. 5. Conclusions An objective parameter g, which is the ratio of net power output to total heat-exchanger area, was used to analyze the performance of an OTEC system with an ORC. The optimal oper- ating temperatures of the system, Tcon,o, Teva,o, and DTw,o, are obtained numerically to evaluate the maximal objective param- eter, gmax, with Tcwi 1⁄4 5 Ce8 C and Twwi 1⁄4 25 Ce28 C for R134a, R152a, R245fa, R600a, and R717. The results obtained support these conclusions: 1. In objective parameter evaluation, R717 performs best, followed by R152a and R600a, and R134a and 245fa perform the worst, when Teva 1⁄4 18 Ce24 C and Tcon 1⁄4 8 Ce14 C. Conversely, R600a has the highest thermal efficiency. M.-H. Yang, R.-H. Yeh / Renewable Energy 68 (2014) 25e34 33 Fig. 9. The influences of Twwi on (a) Tcon,o, (b) Teva,o, (c) gmax, and (d) hth at Tcwi 1⁄4 5 C. Fig. 10. The influences of (a)Tcwi and (b) Twwi on DTw,o.

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