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Demonstration of No-Vent Fill and Solidification of Nitrogen for the Nicmos Dewar

  • Chris D. Miller
Chapter
Part of the Advances in Cryogenic Engineering book series (ACRE, volume 39)

Abstract

In order to minimize parasitic heat loads and achieve a five-year mission lifetime, the NICMOS solid nitrogen dewar has been designed with a single fluid line serving as both fill and vent for the cryogen tank. A no-vent fill of liquid nitrogen (LN2) is necessary to achieve a reasonable fill time with this configuration. High density of the solid nitrogen (SN2) is also desired in order to maximize dewar efficiency. A test was conducted at Ball Electro-Optics and Cryogenics Division in December of 1992 to demonstrate the capability to perform a no-vent fill of LN2 and to determine the attainable solid nitrogen density. The test was successful in achieving a complete no-vent fill of the 67 L test tank with LN2. The loaded LN2 was then solidified using cold helium gas circulated through the tank wall heat exchanger. A series of additional loading steps achieved a bulk cryogen fill density of 94% of the maximum SN2 density at 60K. The no-vent fill procedure should be applicable to other solid cryogen systems in which the cryogen can exist in a liquid phase, and could be a candidate method for on-orbit replenishment of certain spaceborne liquid cryogen systems.

Keywords

Heat Exchanger Test Tank Inlet Port Cryogenic Engineer Helium Coolant 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

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    R. L. Oonk, “Design of the Solid Nitrogen Dewar for the Near-Infrared Camera and Multi-Object Spectrometer”, Advances in Cryogenic Engineering, Vol 37B, 1992, p. 1385.CrossRefGoogle Scholar
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Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • Chris D. Miller
    • 1
  1. 1.Electro-Optics and Cryogenics DivisionBall Aerospace and Communications GroupBoulderUSA

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