Browse Publications Technical Papers 1999-01-2477
1999-08-02

Flight Verification of a Nitrogen Triple-Point Cryogenic Thermal Storage Unit (CTSU) 1999-01-2477

This paper describes the flight verification of a nitrogen triple-point Cryogenic Thermal Storage Unit (CTSU), which flew as part of the CRYOTSU payload on STS-95 in late 1998. The CTSU flight unit is a dual-volume device with a 140 cc beryllium cryogenic heat exchanger and a 17 liter stainless steel ambient storage tank. During the flight, the CTSU demonstrated 3 kJ of energy storage at 63.15 K with variable heat loads from 5-9 W. An additional test was performed which demonstrated nitrogen's solid-solid transition at 35 K with 1 kJ of energy storage. The zero-g environment had no measurable impact on CTSU operation.

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