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Background Past development efforts on water electrolysis systems and modules employing the static water feed concept have demons Tad this system's inherent simplicity and long operating life (gabilities. Various approaches to system design by different developers and results of extensive test programs have identi- fied potential improvements and problento be avoided in the design of a Static Feed WatMElectrolysis System (SFWES) and of water electrolysis systems in general. The major problems identified with the SFWES were: (1) the need for feed water degassing, (2) the need for condenser/separators, and (3) the need for high cell voltages to sustain high current densities. Program Objectives The overall program objective was to develop a SFWEM and associated test system which would avoid the problems and design limitations and make the SFWES concept a viable candidate for spacecraft application. To accomplish this the program's efforts were directed towards meeting four specific objectives: 1. Elimination of water feed compartment degassing. 2. Elimination of the need for zero gravity condenser/separators through the use of product gas decompression and electrochemical dehumidification. 3. Increase current density capability through increasing electrode performance and optimizing cell configuration. 4. Emphasize "self-contained" aspects during the module's testing so that operation is independent of laboratory instrumentation and complicated startup/shutdown procedures. General objectives considered throughout the program were: 1. Advancement of water electrolysis technology as far as possible without risking the design on such an advanced concept that might pre- vent successful completion of the Parametric Test Program. 2. Aim toward a flight-qualifiable configuration with the technology program not viewed as an isolated end in itself, but as a step toward designing the optimum method for meeting the water electrolysis requirements of future space activities. 3. Development of a module (02 and H2 generator) with the best chance for incorporation into the Space Station application when integrated with the ng (SSP) ' out the Station al subsystem accessories. The Space Station Prototype's applicable design specifications were used as a guide through- development as well as the results of NASA's Modular Space studies.(10) 3 Li/ Systems, J1 c.PDF Image | WATER ELECTROLYSIS MODULE
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