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Session: Turbo expanders III
Session starts: Tuesday 08 October, 15:40
Presentation starts: 16:00
Room: Van Weelde Zaal

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Luca Sciacovelli (Arts et Métiers ParisTech, Laboratoire DynFluid)
Paola Cinnella (Arts et Métiers ParisTech, Laboratoire DynFluid )

Abstract:
Many studies have demonstrated that supercritical ORCs, i.e., ORCs in which heat is supplied at a pressure greater than the liquid/vapor critical point pressure, have an even greater potential, since they allow better recovery efficiency for a simplified cycle architecture . The selection of the most suitable working fluid is of crucial importance in designing an ORC process, since it requires to take into account thermodynamic, environmental and safety aspects. In this work, we numerically investigate the performance of three axial, multi-stage, ORC turbines. All of them were designed for low-temperature heat recovery purposes. In two cases, the working fluids are the refrigerants R134a and R245fa. Both supercritical and subcritical inlet conditions are considered. A fully supercritical carbon dioxide (CO$_2$) turbine is also studied for comparison.