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., the Environmental Control and Life Support System (ECLSS), the Electric Power System (EPS), Extravehicular Activity (EVA), and the Propulsion and Reboost System. The ECLSS uses the SFE to generate metabolic oxygen (O2) for the crew, to provide reactants for carbon dioxide (CO2) removal, and to furnish hydrogen (H2) for reduction of the CO2. ...An SFE is also capable of generating propellants for the Propulsion and Reboost System. The commonalities between these four systems are examined, requirements for the individual subsystems are discussed and the benefits of addressing the SFE as a Space Station utility are highlighted.

(Life Systems) as part of NASA's effort to mature water electrolysis technology for application in the Space Station Environmental Control/Life Support System (ECLSS), Propulsion and Reboost System, Extravehicular Activity (EVA) and Electric Power System (EPS). The water electrolysis process generates metabolic oxygen (O2) for the crew cabin, EVA backpacks and air lock, and provides reactants for carbon dioxide (CO2) removal, CO2 reduction, propulsion/reboost systems and fuel cell electric power generation. ...The NASA has selected to use water electrolysis aboard the Space Station to provide the O2 and hydrogen, (H2) for use in the ECLSS and the Propulsion System. Other applications of electrolysis technology in space are energy storage using a Regenerative Fuel Cell System (RFCS) and O2 bottle recharging for EVA application.

Both O2 and H2 are envisioned to be used in a variety of processes including crew life support, spacecraft propulsion, extravehicular activity, electrical power generation/storage as well as in scientific experiment and manufacturing processes. ...The energy storage application utilizes O2 and H2 as reactants for a fuel cell. The propulsion application utilizes high pressure O2 and H2 as propellants. The EVA application utilizes ultrahigh pressure O2 to recharge the O2 bottle in the extravehicular mobility unit.