Abstract This paper describes a cryogenic refrigeration cycle that combines a recuperative lower stage with a regenerative upper stage. The resulting cryocooler avoids the inherent thermal saturation and void volume losses that are associated with a regenerator and therefore has the potential for high performance at low temperature. The hybrid concept also has advantages relative to thermal, mechanical, and electrical integration as well as reliability. The hybrid configuration examined here uses a system of check valves and buffer volumes in order to rectify the oscillating flow within a pulse tube into a quasi-steady flow that can energize a reverse-Brayton stage. Thissystem is analyzed using a first-order model. The governing equations are derived and then reduced to dimensionless form through the selection of logical dimensionless groups that characterize various aspects of the hybrid system. The ideal model is verified by showing that it predicts the correct efficiency in the limit of pure pulse tube operation. The model is used to investigate the effect of the rectification system on cycle performance; both in terms of losses associated with the check valves as well as turbine power fluctuations caused by cyclic variations in the flow. Finally, the model is used to optimize a hybrid cryocooler for a specific set of operating conditions by maximizing the heat lifted per heat transfer in the recuperator and regenerator.


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    Titel :

    A First Order Model of a Hybrid Pulse Tube/Reverse-Brayton Cryocooler


    Beteiligte:
    Nellis, G. F. (Autor:in) / Maddocks, J. R. (Autor:in) / Kashani, A. (Autor:in) / Baik, J. H. (Autor:in) / Pfotenhauer, J. M. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2003-01-01


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz/Kapitel (Buch)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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