Further Developments on a Vibration-Free Helium-Hydrogen Sorption Cooler

J.F. Burger, H.J. Holland, R.J. Meijer, H.J.M. ter Brake, J. Doornink, A. Sirbi, M. Linder

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    Abstract

    In our continuous effort on the development of a passively precooled two-stage
    4.5 K / 14.5 K helium-hydrogen sorption cooler, a number of important development steps were made. Firstly, an improved high-density activated carbon was used for the fabrication of four new sorption cells. Tests with these new cells showed that because of increased efficiency, the required passive radiator area for this cooler reduced by a factor of 1.3. Secondly, it was shown that this cooler architecture can easily be used to reach lower (or higher) temperatures. Without hardware changes, the cold temperature was reduced from 4.5 K to 3.1 K. Thirdly, long-term experiments were carried out on the cooler. In two separate periods of two and four months of continuous operation, no change at all was observed in the cooler performance. Fourthly, clogging effects were analyzed that occurred after a 15 months storage period of the cooler at 300 K. We concluded that hydrogen diffusion out of the stainless steel components should be prevented. Finally, a design of an integrated compact cooler chain was presented, which consists of a 50 K Stirling cooler and the helium-hydrogen sorption cooler. This package may be used in the future to test the sorption cooler technology in a zero-gravity environment.
    Original languageEnglish
    Title of host publicationCryocoolers 15
    EditorsSaul D. Miller, Ronald G. Ross Jr.
    Place of PublicationBoulder, CO, USA
    PublisherICC Press
    Pages23-30
    ISBN (Print)978-1-934021-01-9
    Publication statusPublished - 2009
    Event15th International Cryocooler Conference, Cryocoolers-15 2008 - Long Beach, United States
    Duration: 9 Jun 200812 Jun 2008
    Conference number: 15

    Publication series

    NameInternational Cryocooler Conference
    PublisherICC Press
    Volume15
    ISSN (Print)1549-1757

    Conference

    Conference15th International Cryocooler Conference, Cryocoolers-15 2008
    Abbreviated titleCryocoolers
    CountryUnited States
    CityLong Beach
    Period9/06/0812/06/08

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