Experimental characterization of a hermetic scroll expander for use in a micro-scale Rankine cycle

Lemort, Vincent; Declaye, Sébastien; Quoilin, Sylvain

doi:10.1177/0957650911413840

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Experimental characterization of a hermetic scroll expander for use in a micro-scale Rankine cycle

Lemort, Vincent; Declaye, Sébastien; Quoilin, Sylvain

2011 • In Proceedings of the Institution of Mechanical Engineers. Part A, Journal of Power and Energy

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https://hdl.handle.net/2268/95649

DOI
10.1177/0957650911413840

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Keywords :

scroll expander; organic rankine cycle; ORC; hermetic

Abstract :

[en] This paper presents the results of an experimental study carried out on a prototype of a hermetic scroll expander, integrated into a gas cycle test rig, whose working fluid is HFC-245fa. This system was designed to test only the performance of the expander. It is mainly made up of a scroll compressor, a scroll expander, a heat exchanger and a by-pass valve. The latter is used to adjust the pressure ratio imposed to the expander. The expander is originally a compressor designed for heat pump applications and characterized by a nominal power input of 2.5 kWe. Performance of the expander is evaluated in terms of isentropic effectiveness and filling factor as function of the main operating conditions. The study also investigates the impact of oil mass fraction on the expander performance. Maximum overall isentropic effectiveness of 71.03% is measured, which is partly explained by the good volumetric performance of the machine. Using the experimental data, parameters of a semi-empirical simulation model of the expander are identified. This model is used to analyze the measured performance of the expander. Finally, a polynomial empirical model of the expander is proposed for fast and robust simulations of ORC systems.

Disciplines :

Energy

Author, co-author :

Lemort, Vincent ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques

Declaye, Sébastien ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques

Quoilin, Sylvain ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Systèmes énergétiques

Language :

English

Title :

Experimental characterization of a hermetic scroll expander for use in a micro-scale Rankine cycle

Publication date :

2011

Journal title :

Proceedings of the Institution of Mechanical Engineers. Part A, Journal of Power and Energy

ISSN :

0957-6509

eISSN :

2041-2967

Publisher :

Sage Publications

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 15 July 2011

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117

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