Expansion machine for a low power-output steam Rankine-cycle engine

The performance of the expansion device in a Rankine-cycle engine is one of the major parameters dictating the engine's overall energy-conversion efficiency. In this paper, the screening process undertaken to choose the most suitable expansion machine for a steam Rankine-cycle engine, operating...

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Veröffentlicht in:Applied energy 1991, Vol.39 (2), p.93-116
Hauptverfasser: Badr, O., Naik, S., O'Callaghan, P.W., Probert, S.D.
Format: Artikel
Sprache:eng
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Zusammenfassung:The performance of the expansion device in a Rankine-cycle engine is one of the major parameters dictating the engine's overall energy-conversion efficiency. In this paper, the screening process undertaken to choose the most suitable expansion machine for a steam Rankine-cycle engine, operating principally as a ‘mini’ combined heat-and-power unit, is described. In the low power-output range (i.e. 5–20 kW) envisaged rotary, positive-displacement machines offer many advantages compared with turbines and reciprocatingpiston expanders. So rotary-vane, helical-screw and Wankel-type expansion devices were short listed. However further assessments, based upon operational problems and cost effectiveness, led finally to the choice of the Wankel-type expander for the proposed application. Nevertheless, for this machine to be commercially successful, existing designs need to be modified and optimised.
ISSN:0306-2619
1872-9118
DOI:10.1016/0306-2619(91)90024-R