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A Solid Cryogen Refrigerator for 50°K Infrared Detector Cooling

  • R. P. Caren
  • R. M. Coston
Conference paper
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 13)

Abstract

Requirements for spaceborne cryosystems for cooling infrared detectors include minimum weight, power, and volume, while retaining high reliability and long life. A ready solution are systems employing either solid or liquid cryogens. Of the two systems, a solid cryogen is more favorable for the following reasons:
  1. 1.

    In the low-gravity conditions of a spacecraft, there is no venting problem for a solid cryogen, whereas for a liquid there could be two-phase venting.

     
  2. 2.

    In the solid system, the latent heat of fusion is available for refrigeration. For most cryogens, this is a 10 to 15% gain in refrigeration capacity. Additionally, there is a 10 to 15% gain in density in the solid phase. This permits construction of a smaller, lighter weight system.

     

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References

  1. 1.
    V. J. Johnson, ed., “A Compendium of the Properties of Materials at Low Temperature (Phase 1), WADD Tech. Rept. 60–56 Part 1 (1961).Google Scholar
  2. 2.
    W. T. Ziegler, J. C. Mullin, and B. S. Kirk, “Calculation of the Vapor Pressure and Heats of Vaporization and Sublimation of Liquids and Solids Especially Below One Atmosphere,” Vols. I, II, III, IV, V, Engineering Experiment Station, Georgia Institute of Technology, Atlanta, Ga. (1963).Google Scholar
  3. 3.
    W. T. Ziegler, “The Vapor Pressures of Some Hydrocarbons in the Liquid and Solid State at Low Temperatures,” NBS Tech. Note No. 4 (1959).Google Scholar
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    E. R. Dobbs and G. O. Jones, Repts. Progr. Phys., 20:516 (1957).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • R. P. Caren
    • 1
  • R. M. Coston
    • 1
  1. 1.Lockheed Missiles and Space CompanyPalo AltoUSA

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