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  • 1
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    Cryogenic and thermal design for the Superfluid Helium On-Orbit Transfer (SHOOT) experiment (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The analysis and trade-offs of the external thermal design of the two 200-liter dewars required in the SHOOT experiment to extend space mission life by superfluid helium replenishment are discussed. Also considered are the support electronics and the optimization and prediction of the performance of the dewar and cryostat assemblies. Particular attention is given to the ground-hold and standby performance of the dewars, along with the temperature of the helium bath during high-flow-rate helium transfers.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Advances in cryogenic engineering.; Jun 14, 1987 - Jun 18, 1987; Saint Charles, IL; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Comparison of SIRTF dewar performance in the 900 km and 100,000 km orbits (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Feasibility studies showed that the Space Infrared Telescope Facility (SIRTF) can be launched into a 100,000-km high earth orbit (HEO) using a Titan/Centaur launch vehicle. This paper compares the performance of an all-superfluid helium dewar system for SIRTF under conditions of the LEO (900-km) and the HEO missions. Results show that the SIRTF all-superfluid He dewar can achieve a 5-yr lifetime for the 100,000 km HEO mission, with 20 percent margin. Methods to achieve further enhancement of dewar lifetime for the HEO mission are suggested.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: 1989 Cryogenic Engineering Conference; Jul 24, 1989 - Jul 28, 1989; Los Angeles, CA; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Pump performance requirement for the liquid helium orbital resupply tanker (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Liquid Helium Orbital Resupply Tanker (currently renamed to Superfluid Helium Tanker) will greatly enhance the lifetime of the space missions which require superfluid helium. The Superfluid Helium Tanker pump performance requirement is driven by the superfluid helium replenishment needs of the Space Infrared Telescope Facility (SIRTF). SIRTF is one of the space missions which will require on-orbit superfluid helium resupply in the 1990s. The Superfluid Helium Tanker will carry at least 10,000 L of superfluid helium and provide a minimum pump head of 170 torr (0 to 200 L/h) to cool SIRTF from 150 to 2 K. When the SIRTF tank starts to collect liquid, a minimum flow rate of 300 L/h with a pump head of 60 torr is required to fill the 4000-liter tank.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Advances in cryogenic engineering.; Jun 14, 1987 - Jun 18, 1987; Saint Charles, IL; United States
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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