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pressure levels. Figure 2 indicates that low operating temperatures, low electro- lyte concentration, low cabin atmospheric pressures, and high system operating pressures result in a low dew point level. The DM accepts the SFWEM product gases (0 and H ) to electrolytically remove a portion of the water vapor contained in tiem. T~e gases are then reduced in pressure by expansion through regulators, which reduces the dew points below the desired level, i.e., 287K (57F). An optimization with respect to SFWEM and DM operating pressures, temperatures, and electrolyte concentrations had to be performed to arrive at the overall system optimum operating conditions. Elimination of Degassing Requirements Accumulation of gases within the SFWES and feed cavities of individual cells of a SFWEM causes performance degradation and eventual system failure. A design goal of the SFWEM was to allow for operation without the requirement for feed water or feed water cavity degassing. Previous operation with single static feed iater electrolysis cells had demonstra ed operation for 300 hours at 108 mA/cm (100 ASF) and 100 hours at 323 mA/cm (300 ASF) without degassing require- ments. An objective of this program was to totally eliminate the need for degassing. The general design approach for the advanced SFWEM was to eliminate possible sources and causes of gas accumulations within the water feed cavities rather than to treat the problem after gases had accumulated. Three basic sources for gassing were identified: 1. 2. Cross-leakage of H2 into the water feed cavities. Stray electrolysis within liquid passages and cavities. 3. Hydrogen Cross-leakage Release of dissolved gases from the makeup feed water. Cross-leakage of H2 into the water feed cavities results from structural cell/ matrix failure due to excessive pressure differentials or water feed matrix dryout. This dryout was normally caused by gas accumulation due to the other two causes of gas liberation or by excessive heat release at the cell electrodes. The SFWEM was designed with proper structural matrix support proven in past water electrolysis module designs, while the test system was designed with monitoring instrumentation that prevents out-of-tolerance pressure differentials from existing. Stray Electrolysis One of the most detrimental sources of gassing was stray (intercell) electroly- sis. Since gas evolution by electrolysis requires a metallic surface, the 15 Li/cSystcms, J4c.PDF Image | WATER ELECTROLYSIS MODULE
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