Abstract Mechanical cryogenic refrigerators, used to cool space based instruments, are often sized to provide constant cooling at a specified temperature and available input power. Intermittent sensor heat loads greater than the designed value will result in unsteady sensor temperatures. A thermal storage unit (TSU) is a device which absorbs the spike heat loads while providing a stable temperature reservoir for the sensor. The authors have constructed and tested a single volume TSU which absorbs heat loads by melting nonexpendable, totally-retained nitrogen at its triple point in a constant pressure-temperature-volume process. This system is designed to provide approximately 5 W-hr of thermal storage capacity at 63.1 K. Presented in this paper are the results of the measured thermal capacity and stability, investigating supercooling and superheating phenomena, and instrument simulations in 0° and 180° orientations.


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    Title :

    Test Results of a Nitrogen Triple-Point Thermal Storage Unit


    Contributors:

    Published in:

    Publication date :

    2002-01-01


    Size :

    10 pages




    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




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