Thermo-fluid dynamics preliminary design of turbo-expanders for ORC cycles

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• 作者：Daniele Fiaschi ; ^{daniele.fiaschi@unifi.it} ; Giampaolo Manfrida¹ ; Francesco Maraschiello¹
• 关键词：Organic Rankine Cycles ; ORC turbo expander design ; Combined heat and power
• 刊名：Applied Energy
• 出版年：2012
• 期刊代码：2_03062619
• 类别：pw
• 出版时间：September, 2012
• 卷：97
• 期：Complete
• 页码：601-608
• 文件大小：702 K

摘要

Selecting the best design options for turbo-expanders to be used in Organic Rankine Power Cycle applications is a difficult task, with special reference to the low-temperature applications (T < 150 掳C) which are relevant for specific fields in rapid development (geothermal binary plants, solar thermal energy conversion systems). A wide literature exists on the optimal selection of the working fluid from the thermodynamic point of view; while the fluid dynamics design is often based on the direct application of CFD techniques, without a preliminary screening on the issues of application of a specific working fluid. In practice, however, the selection of the working fluid has relevant effects both on the cycle thermodynamics and on the fluid dynamic losses and turbo-expander efficiency. Referring to a radial-type turbo-expander, a comparison of different working fluids is presented and discussed.