Heat Transfer Through a Multilayer Insulation System as a Function of Pressure in the Cryostat Vacuum Space

  • M. A. Green
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 43)


When one builds a high quality cryostat, one strives to have a good vacuum (better than 1 mPa) in the space where there is multilayer insulation between the cryogen vessel and the outer vacuum vessel. When designing any cryostat, one should always ask the following question; What happens if the insulting vacuum is not good? This paper presents a technique for analyzing the performance of a cryogenic insulation system when the insulating vacuum is not so good. From the analytical calculations presented in this report, one can improve the insulation system so that acceptable insulation performance can occur even when the pressure in the vacuum space is as high as 100 mPa. Of particular interest is the calculation of insulation performance when the vacuum fails. The difference between an air or nitrogen leak, and a helium leak or a hydrogen leak is illustrated.


Heat Transfer Vacuum Space Plate Spacing Multilayer Insulation Combine Heat Transfer 
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Copyright information

© Springer Science+Business Media New York 1998

Authors and Affiliations

  • M. A. Green
    • 1
  1. 1.E. O. Lawrence Berkeley National LaboratoryUniversity of CaliforniaBerkeleyUSA

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