Ultra-Efficient Insulation System for Solid Cryogen Coolers
This paper describes the potential application to a solid hydrogen cryogen cooler of a recently developed technique for greatly reducing the evaporation losses of a multilayered insulation system. The insulation technique, termed Multi-Shielding, provides a method to efficiently utilize the cold gas resulting from solid sublimation to intercept a portion of the heat leak through the insulation system. In this respect, a solid cryogen cooler provides the ideal application for the Multi-Shielding technique because of the excess sensible refrigeration available as a result of additional solid cryogen sublimation by the electronic heat load. The Multi-Shielding technique has been successfully applied to hundreds of Linde commercial 100-liter liquid helium storage containers, resulting in a total heat leak to the liquid helium of only 0.025 W without the use of liquid nitrogen as auxiliary refrigeration. To illustrate the potential system weight savings with this technique, equations were developed and calculations performed to determine comparative system weights for a 1000-hr-life solid hydrogen cooler utilizing Super Insulation only and Super Insulation with Multi-Shielding.
KeywordsOuter Shell System Weight Weight Saving Total Heat Flux Insulation System
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