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A Fuel Cell Energy Storage System Concept for the Space Station Freedom Extravehicular Mobility Unit
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English
Abstract
The paper gives an update on an advanced development effort carried out under NASA Johnson Space Center (NASA/JSC) NAS 9-17775 by Ergenics Power Systems, Inc. (EPSI). The work was initiated in April 1987 to design and build a Fuel Cell Energy Storage System (FCESS) bench-test unit for the Space Station Freedom Extravehicular Mobility Unit (EMU). Fueled by oxygen and hydride stored hydrogen, the FCESS is being considered as an alternative to the EMU zinc-silver oxide battery. Superior cycle life and quick recharge are its main attributes. Design and performance of a non-venting 28V, 34 Ahr system with 7 amp rating are discussed. The FCESS is comprised of a 32-cell proton exchange membrane (PEM) stack, a metal hydride storage vessel and a control subsystem. The stack design incorporates passive product-water removal and thermal integration with the hydride vessel. The hydride vessel stores enough fuel for 5 hours. The control subsystem provides reactant pressure and flow regulation, automatic startup, shutdown and electronic protection against malfunctioning
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Citation
Adlhart, O., Rosso, M., and Marmolejo, J., "A Fuel Cell Energy Storage System Concept for the Space Station Freedom Extravehicular Mobility Unit," SAE Technical Paper 891582, 1989, https://doi.org/10.4271/891582.Also In
References
- A Fuel Cell Energy Storage System for Space Station Extravehicular Activity Rosso M.J. Adlhart O.J. EPSI Marmolejo J.A. NASA JSC 18th Intersociety Conference on Environmental Systems July 1988
- Adlhart O.J. Rosso, H.J. Jr. U.S. Patent Number 4,826,741 May 2 1989 Ion-Exchange Fuel Cell Assembly with improved Water and Thermal Management
- Advanced Extravehicular Mobility Unit (EMU) Fuel Cell Energy Source Phase I Final Report, NAS 9-17775 October 1987