In the past, the approach to the design of organic Rankine cycle (ORC) engines has been fairly conservative. In general, subcritical cycle conditions have been selected and comparatively low component efficiencies have been assumed. This has resulted in low overall power conversion unit (PCU) efficiencies in the 18 % (DIPS) to 25 % (ORCEPS) range. With the selection of solar dynamic systems as possible candidates for the Space Station power modules, it has become obvious that increased power conversion unit efficiencies are desirable to reduce overall solar dynamic power module weights and volumes. This paper discusses the potential for increasing ORC engine efficiencies by the use of supercritical cycles and increased component efficiencies. Both CP-25 (toluene) and RC-1 (hexafluorobenzene-pentafluorobenzene) working fluids are considered. The technical issues of operating in the supercritical regime, as well as a comparison of the characteristics of the working fluids in achieving high component efficiencies, are discussed. The approach to achieving higher component efficiencies and the estimated achievable values are also described.


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    Titel :

    Supercritical organic Rankine engines (SCORE)


    Weitere Titelangaben:

    Superkritische organische Rankine-Maschinen (SCORE)


    Beteiligte:
    Boretz, J.E. (Autor:in)


    Erscheinungsdatum :

    1986


    Format / Umfang :

    5 Seiten, 7 Bilder, 6 Tabellen, 8 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





    Predicting Toluene Degradation in Organic Rankine-Cycle Engines*

    Cole, R.L. / Demirgian, J.C. / Allen, J.W. | AIAA | 1987


    Solar powered organic Rankine cycle engines - characteristics and costs

    Barber,R.E. / Barber-Nichols Engineering,Arvada,US | Kraftfahrwesen | 1976


    The Use of Organic Working Fluids in Rankine Engines

    Curran,H.M. / Hittman,US | Kraftfahrwesen | 1980