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Electrolysis Problems To Be Avoided A review of applicable electrolysis literature was performed as part of the design activities of the SFWEM to identify limitations and problems to be avoided. Problem areas identified were either applicable to electrolysis systems in general, or were oriented specifically toward the static feed concept. The SFWEM and its test system were designed with emphasis on avoiding these problems and limitations. General Water Electrolysis Subsystem Problems Based on a review of various approaches to water electro4 sI subsystems, the following problem areas and limitations were identified. 1. 2. 3. 4. 5. 6. 7. 8. 9. Water vapor condensers, associated zero gravity liquid-gas separators, condensed water accumulators and water vent and aerosol traps were sources of increased maintenance, contributed to decreased reliability, and added to subsystem weight and development costs. High liquid volume, zero gravity liquid-gas separators decreased system reliability, and increased subsystem maintenance and develop- ment costs. High failure rates of water electrolysis subsystems resulted from failures in peripheral subsystem components rather than in the electrol- ysis module itself. This resulted in a low mean-time-between-failure and decreased the life of the modules. Lack of automatic startup and shutdown modes caused operator errors and subsequent system failures. Lack of automatic system monitoring and use of performance trend analysis and fault isolation caused less safe conditions for both equipment and personnel. Lack of positive module temperature control resulted in limitations in operation at off-design conditions and in adverse effects on system operation due to environmental temperature changes. Lack of automatic protection against both high and low individual cell voltages resulted in damage to equipment. Operation at low pressure levels resulted in increased aerosol formation, presenting both a module self-destruct mechanism and corrosion potential. Lack of uniform and positive thermal control of individual cells and modules resulted in limited current density ranges and off-design condition operation. 11 LifeSYsCm$s. J1nc.PDF Image | WATER ELECTROLYSIS MODULE
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