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 |
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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. |
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ISSN: | 0306-2619 1872-9118 |
DOI: | 10.1016/0306-2619(91)90024-R |