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Especially for medium power systems, i.e. waste heat fluxes between 200 and 400 kW, a novel concept for the expansion engine within a Rankine steam cycle was conceived. The aim was to combine the advantages of reciprocating piston engines and of turbines at reasonable costs. The so-called rotational wing-piston expander uses two pivoting shafts, each holding two wing-like pistons, within one housing, that are performing a cyclic movement relative to one another. This way, four working chambers with varying volumes are resulting, each experiencing repetitive compression and expansion. The conversion of the cyclic changing angular velocity to a constant rotation at the output shaft is done via a non-circular gear. This solution offers the possibility of sealing the lubricated gearbox against the steam-flooded section containing the working chambers via rotational seals, being much easier than the sealing within a conventional reciprocating piston engine.
This paper starts with treating the design and layout of this novel expansion engine concept, followed by mechanics development. The strategy for creating a robust and effective expansion engine design as well as the most important findings and insights gained during the experimental investigations of the engine are shown.
|Title of host publication||Proceedings of the 5th International Seminar on ORC Power Systems|
|Publisher||The National Technical University of Athens (NTUA)|
|Number of pages||8|
|ISBN (Electronic)||ISBN: 978-90-9032038-0|
|Publication status||Published - 10 Sep 2019|
Sebastian Schurl (Speaker)9 Sep 2019 → 11 Sep 2019
Activity: Talk or presentation › Talk at conference or symposium › Science to science