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

Paper #:
  • 1999-01-2477

Published:
  • 1999-08-02
Citation:
Bugby, D. and Stouffer, C., "Flight Verification of a Nitrogen Triple-Point Cryogenic Thermal Storage Unit (CTSU)," SAE Technical Paper 1999-01-2477, 1999, https://doi.org/10.4271/1999-01-2477.
Pages:
9
Abstract:
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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