Abstract
The hybrid cryogenic cooler is an intermittent Joule-Thomson refrigerator with a precooler in the form of a passive radiator. The properties of the J-T expansion and the gas storage vessel are used to select fluids on the basis of available refrigeration per unit mass. Surface forces and container geometry are used to confine and control the liquid cryogen in a zero-gravity environment. The precooler and vaporized liquid are used to reduce parasitic thermal inputs to the point where most of the heat of vaporization is available for useful purposes. Modifications can be made to increase the efficiency or extend the temperature range. Ambient storage combined with efficient operation make the hybrid cooler attractive for space flight applications.
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