5th International Seminar on ORC power Systems

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10:30
20 mins

Comparison of a scroll, a screw, a roots, a Piston Expander and a Tesla Turbine for Small-scale Organic Rankine Cycle
Olivier Dumont, Lorenzo Talluri, Giampaolo Manfrida, Daniele Fiaschi, Vincent Lemort

Session: Session 1A: Turbines-Design Aspects (1)
Session starts: Monday 09 September, 10:30
Presentation starts: 10:30
Room: Olympia

Olivier Dumont (University of Liège)
Lorenzo Talluri ()
Giampaolo Manfrida ()
Daniele Fiaschi ()
Vincent Lemort (University of Liège)

Abstract:
based on an experimental comparison of piston, screw, scroll, roots expanders and Tesla turbine, the latter investigated by a specifically developed simulation model. First, based on a literature review, a comparison of these five expansion machines technologies is performed. Afterward, four expanders [2-4 kW] were tested in a small-scale ORC unit with R245fa as working fluid. The calibration of models based on the measurements allows the prediction of the isentropic efficiency under optimized conditions, in spite of the operating range of the test-rig. A 2D validated model simulates the performance of the machine Tesla Turbine. A comparison of costs and compactness of the 5 investigated expander technologies is also performed. Finally, based on the working charts achieved with the simulation models and on experimental and practical aspects, some guidelines are drawn to help the reader in the selection of the most suitable expander technology for a given application.