Continuous Flow Cryogen Sublimation Cooler
A new technique has been developed that permits temperatures below the triple point to be maintained continuously when liquid cryogen is fed to a special cold stage that vents to vacuum. The technology has been demonstrated using hydrogen which has been liquefied by a Displex GM refrigerator and fed to the cold stage at pressures ranging from 0.1 to 0.5 MPa. With no heat load applied the temperature remained constant at 9.7 K independent of pressure. The temperature and sublimation rate increased when heat was applied. This paper describes the device that was tested and presents a theoretical model which explains the results.
KeywordsCapillary Tube Triple Point Heat Load Heat Flow Rate Cold Stage
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- 1.J. J. Wu, S. Bard, W. Boulter, J. Rodriguez and R. C. Longsworth, “Experimental Demonstration of a 10 K Sorption Cryocooler Stage”, Advances In Cryogenic Engineering, Vol. 39, Plenum Press, New York, 1994Google Scholar
- 2.R. C. Longsworth and A. N. Khatri, “Continuous Flow Cryogen Sublimation Cooler”, U. S. Patent 5,385,027, Jan. 31, 1995Google Scholar