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Session: Volumetric expanders I
Session starts: Tuesday 08 October, 09:00
Presentation starts: 09:20
Room: Van Beuningen Zaal

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Iva Papes (Ghent University)
Joris Degroote (Ghent University)
Jan Vierendeels (Ghent University)

Abstract:
A number of studies have shown a big potential of Organic Rankine Cycles (ORC) for waste heat recovery. Although ORC systems are now well developed, efforts have been increasingly directed towards higher efficiencies and power outputs. The key element for the power generation in ORC systems is the expander. One of the advantages when using screw and scroll expanders (among other positive displacement machines) is the possibility to use existing compressors with opposite sense of rotation. In this paper, a complete 3D CFD calculation for an oil injected twin screw expander is performed. With an in house code, a block structured grid is generated using the solution of a Laplace problem. In order to lubricate the rotor motion and seal the gaps, oil is injected into the expansion chambers. The working fluid inside the screw expander is treated compressible and the oil phase is modeled with a multiphase model. The results of these 3D CFD calculations will lead to improvements for the maximization of the power output in ORC systems.