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Title: The planck sorption cooler: using metal hydrides to produce 20 K
Authors: Pearson, David P.
Bowman, R.
Prina, M.
Wilson, P.
Keywords: a-intermatallics
hydrogen storage materials
hydrogen absorbing materials
metal hydrides
Issue Date: 1-Oct-2006
Publisher: Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2006.
Citation: International Sumposium on Metal Hydrogen Systems Fundamentals and Applications, Lahaina, Maui, Hawaii, October 1, 2006.
Abstract: The Jet Propulsion Laboratory has built and delivered two continuous closed cycle hydrogen Joule-Thomson (JT) cryocoolers for the ESA Planck mission, which will measure the anisotropy in the cosmic microwave background. The metal hydride compressor consists of six sorbent beds containing LaNi4.78Sn0.22 alloy and a low pressure storage bed of the same material. Each sorbent bed contains a separate gas-gap heat switch that couples or isolates the bed with radiators during the compressor operating cycle. ZrNiHx hydride is used in this heat switch. The Planck compressor produces hydrogen gas at a pressure of 48 Bar by heating the hydride to ~450 K. This gas passes through a cryogenic cold end consisting of a tube-in-tube heat exchanger, three pre-cooling stages to bring the gas to nominally 52 K, a JT value to expand the gas into the two-phase regime at ~20 K, and two liquid – vapor heat exchangers that must remove 190 and 646 mW of heat respectively.
Appears in Collections:JPL TRS 1992+

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