The paper describes the pre-development of the compact turbo-inachinery forming the heart of a reverse- Brayton-cycle refrigeration unit for application in a microgravity-compatible freezer. The machine has been configured to provide refrigeration at -80°C in the face of continuous loads of 10 W and transient loads of up to 30 W without disturbing the microgravity environment. Other important requirements were: operational life-time without maintenance of at least 10 years, high coefficient of performance to minimise power consumption, low mass and small size.In the interests of reliability and microgravity compatibility, the compressor wheel and the expansion turbine have been mounted on the same shaft, driven by a brushless DC electric motor. This approach assures the most compact design, however, it gave rise to complex design iterations. The need to minimise thermal losses resulting from conduction through the shaft and to avoid mechanical resonance effects at the very high (up to 200000 Rpm) shaft speeds, also presented interesting design challenges.Results are presented covering tests on each of the individual components together with performance projection of the complete machine.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Compact Turbo-Machinery for a Micro-Gravity-Compatible Freezer Application


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    International Conference On Environmental Systems ; 1994



    Erscheinungsdatum :

    1994-06-01




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Micro-gravity compatible drive - MGCD

    Nagwaney, B. / Lien, T.K. / Wavre, N. et al. | Tema Archiv | 1993



    Application of CFD to Turbo Machinery

    Pasha, S.G.A. | Online Contents | 1998


    Application of CFD to Turbo Machinery

    Pasha, S. G. A. / Venkatakrishnaiah, T. / Kishore Kumar, S. et al. | British Library Conference Proceedings | 1998


    VEHICULAR FREEZER DEVICE AND FREEZER VEHICLE

    NIHIRA SHIRO | Europäisches Patentamt | 2017

    Freier Zugriff