Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ukae.rept.....b&link_type=abstract
Final Report United Kingdom Atomic Energy Authority, Harwell (England). Materials Physics and Metallurgy Div.
Astronomy and Astrophysics
Astronomy
Astronomical Observatories, Catalysts, Cryostats, Infrared Astronomy, Liquid Hydrogen, Spaceborne Telescopes, Catalytic Activity, Cryogenic Cooling, Cryogenic Equipment, Iron Oxides
Scientific paper
The design and optimization of a para-/ortho-hydrogen converter to increase the efficiency and lifetime of the hydrogen cryogenic system of the ISO project are described. Catalyst technology and associated heat transfer technology is evaluated. Four catalyst systems were characterized. Their catalytic activity under the orbital conditions anticipated for the three radiation shields of ISO are reported. Results from experiments on in situ deactivation and reactivation are given, indicating that this is a key parameter. Iron oxide gel is the most promising catalyst system. A full scale prototype converter was designed to ESTEC specifications, and three converters were manufactured and tested. Performance, except for two small details, meets or exceeds specification. Plans for the development and testing of flight unit converters are proposed.
Baston A. H.
Bradshaw Thomas W.
Butler G.
Chadwick A. T.
Clark N. S.
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