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Water outlet control mechanism for fuel cell system operation in variable gravity environments

United States Patent

July 31, 2007
View the Complete Patent at the US Patent & Trademark Office
National Aeronautics and Space Administration - Visit the Office of the Chief Technologist Website
Water Outlet Control Mechanism for Fuel Cell System Operation in Variable Gravity Environments
A self-regulated water separator provides centrifugal separation of fuel cell product water from oxidant gas. The system uses the flow energy of the fuel cell's two-phase water and oxidant flow stream and a regulated ejector or other reactant circulation pump providing the two-phase fluid flow. The system further uses a means of controlling the water outlet flow rate away from the water separator that uses both the ejector's or reactant pump's supply pressure and a compressibility sensor to provide overall control of separated water flow either back to the separator or away from the separator.
Vasquez; Arturo (Pasadena, TX), McCurdy; Kerri L. (Pearland, TX), Bradley; Karla F. (Houston, TX)
United States of America as represented by the Administrator of the National Aeronautics and Space Administration (Washington, DC), N/A (
10/ 874,004
June 16, 2004