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study of ORC with the expansion process twin screw machines

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study of ORC with the expansion process twin screw machines ( study-orc-with-expansion-process-twin-screw-machines )

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1.5.2 Reheat or dual expansion Figure 7 shows a schematic of such a system. In this cycle two expanders are used. The working fluid is expanded to an intermediate pressure, reheated, and then expanded to the condensing pressure. The intermediate pressure is a design parameter. The two expander stages are analysed separately just as the single stage expander would be. Their efficiencies need not be the same. The reheater is constrained by the pinch-point temperature difference, as in the boiler. The addition of reheat results in an increase in the average heat addition temperature, increasing cycle efficiency. This benefit comes at the cost of an additional expander or turbine and heat exchanger. In addition, reheat creates an added discontinuity in the heating curve of the working fluid making it more difficult to match the thermal resource and working fluid capacitance rates. Matching resource and working fluid capacitance rates is of great importance for system optimization. Figure 7 Schematic ORC system with reheat of the partially expanded vapour 8

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