On-Orbit Cooling Performance of a Miniature Pulse Tube Flight Cryocooler
On-Orbit Cooling Performance of a Miniature Pulse Tube Flight Cryocooler
- Neue Suche nach: Ladner, D. R.
- Neue Suche nach: Radebaugh, R.
- Neue Suche nach: Bradley, P. E.
- Neue Suche nach: Lewis, M.
- Neue Suche nach: Kittel, P.
- Neue Suche nach: Xiao, J. H.
- Neue Suche nach: Ladner, D. R.
- Neue Suche nach: Radebaugh, R.
- Neue Suche nach: Bradley, P. E.
- Neue Suche nach: Lewis, M.
- Neue Suche nach: Kittel, P.
- Neue Suche nach: Xiao, J. H.
Abstract The Miniature Pulse Tube Flight Cryocooler (MPTFC) developed jointly by the National Institute of Standards and Technology (NIST) and Lockheed Martin Astronautics Operations is a two-stage pulse tube (PT) cryocooler designed for flight demonstrations aboard the Space Shuttle. It was first flown on STS-90 in April 1998 and again in December 2001 on STS-108. The design, testing, and data from the first flight have been reported previously. In this paper we report on the on-orbit cooling performance of the MPTFC with and without a heat load at the second stage and compare it to post-flight cooling data. The on-orbit warm-up data with a 2nd stage heat load of 45 mW after the compressor is switched off are also compared to post-flight laboratory data. While the on-orbit and laboratory cooldown and cooling performance data are found to be nearly identical, the 90 minute orbital temperature variation on the heat rejection surface has a significant effect on the cooler component and stage temperatures. Also, while the on-orbit and laboratory steady state temperature difference data with the heat load are also nearly identical after complete warm-up, the on-orbit dynamic conductance data during the warm-up exhibit anomalous behavior that is attributed to the outgassing of cryopumped contaminants.
Dokumentinformationen
On-Orbit Cooling Performance of a Miniature Pulse Tube Flight Cryocooler
Cryocoolers 12 ; 777-787
2003-01-01
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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