Flight Results from the Cryogenic Thermal Storage Unit (CTSU) Flight Experiment on STS-95

Paper #:
  • 1999-01-2085

Published:
  • 1999-07-12
Citation:
Bugby, D. and Stouffer, C., "Flight Results from the Cryogenic Thermal Storage Unit (CTSU) Flight Experiment on STS-95," SAE Technical Paper 1999-01-2085, 1999, https://doi.org/10.4271/1999-01-2085.
Pages:
10
Abstract:
This paper describes the Cryogenic Thermal Storage Unit (CTSU) flight experiment, which flew as part of the CRYOTSU payload on STS-95 in late 1998. The CTSU flight unit is a dual-volume nitrogen triple-point device with a 140 cc beryllium cryogenic heat exchanger and a 17 liter stainless steel ambient storage tank. During the 9-day flight, the CTSU completed all testing goals including 22 full freeze-thaw and 18 partial freeze-thaw cycles at power levels from 5-9 W. All tests were successful and demonstrated 3000 J of energy storage at 63.15 K. An additional test was performed which demonstrated nitrogen’s solid-solid transition at 35 K with 1000 J of energy storage. The zero-g environment had no discernible impact on CTSU operation.
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