Organic Rankine Cycles for Waste Heat Recovery and Solar Uses

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Organic Rankine Cycles for Waste Heat Recovery and Solar Uses ( organic-rankine-cycles-waste-heat-recovery-and-solar-uses )

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Chapter 6: Case studies In the following parametric studies, the temperature glide value will always be set to its optimal value for each computed working point. This value is obtained with the "Golden Section Search" algorithm. Figure 80: Influence of the HTF temperature glide Influence of the evaporating pressure The selection of the optimal evaporating temperature results in a tradeoff between collector efficiency and cycle efficiency. In the particular case of an ORC using volumetric expanders, increasing the evaporation temperature also increases the under-expansion losses and reduces the cycle efficiency, which constitutes an additional influence. The goal of this section is to illustrate the influence of the evaporating temperature on different cycle parameters and performance indicators. For Figure 81: Influence the evaporation temperature on the performance. that purpose, an arbitrary working point is selected: the selected working fluid is HFC-245fa, with a two-stage expander, an optimized heat transfer fluid temperature glide, a superheating of 5K, and a subcooling of 5K. 12

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