Future space-based, infrared, earth surveillance systems may one day be cooled by large heat-pipe radiators operating at 70 K or even as low as 40 K. The use of passive radiators could eliminate the need for mechanical refrigerators and the attendant problems of power consumption and long-life reliability. A large two-stage heat-pipe radiator was developed for testing on the ground to verify the thermal performance and structural integrity of large, multi-watt, passive cryogenic radiators. The radiator has a projected base area of 8.1 m(exp2) and is designed to reject a 5-W heat load to space at 70 K. The radiator design includes three oxygen heat pipes which transport the 5-W heat load from a simulated detector focal plane and distribute it over the second-stage radiator surface. The radiator is also designed to withstand the launch environment imposed by a Shuttle orbiter or a Titan III launch. Design tradeoffs are discussed, and the final radiator design configuration is described. Preliminary thermal vacuum test results and thermal model predictions are presented. (Wassmann)


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    Title :

    Development of a 5-watt 70 K passive radiator


    Additional title:

    Entwicklung eines 5-Watt-70-K-Passivradiators


    Contributors:

    Published in:

    Publication date :

    1980


    Size :

    8 Seiten, 16 Bilder, 4 Tabellen, 6 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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