Solar Thermal Propulsion systems require long-term storage of liquid hydrogen. NASA's Hydrogen On-Orbit Storage System (HOSS) experiment was intended to demonstrate technologies critical to this concept, including a LAD and TVS. This paper describes the analysis and re-design of the TVS to function in the small (80 liter) dewar designed by the Space Dynamics Laboratory at Utah State University in conjunction with the NASA Lewis Research Center. The re-design uses the same approach as the NASA design for a larger system. The heat exchanger and Joule-Thomson device in particular are addressed. The design theory of a LAD is also presented.
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