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4i/c Systcms. Ac. resulting in the overall net reaction of electrical energy + H20 = t 20 + heat (11) Electrolysis Concepts Selected In concept, the DM is a water electrolysis module with water supplied in vapor form with the H2 and 0, obtained from the SFWEM. The design of the DM, as in any water electrolysis-module, requires the definition of four basic concepts. They are: 1. The nature of the electrolyte 2. Electrolyte incorporation 3. Heat removal 4. Water addition Electrolyte A sulfuric acid (H2SO4 ) electrolyte was selected for the DM because of its affinity to absorb water from gases with higher water vapor pressure. Sulfuric acid also will not dry out and crystallize at high concentrations, allowing, therefore, operation at the low dew points desired. Electrolyte Incorporation The electrolyte incorporation selected was that of using a porous matrix made from custom-blended acid resistant asbestos to (1) keep the cell electrodes close together for low internal resistance, hence low equivalent weight and low power consumption requirements, and (2) provide a high stability to pressure differentials. Water Feed By definition, the water feed to the electrolysis site will be in the form of vapor carried in the 0, and H2 gases at the SFWEM operating pressure, electrolyte concentration, and temperature. The absorbed water is then electrochemically decomposed into 02 and H2 and, because of the direction of electron flow, is placed back into its respective H2 and 02 cavities as a gas. Heat Removal A liquid coolant loop circulating through a separate cavity within each cell of the DM was selected to simplify eventual integration with the SFWEM. Since near equal temperatures for the DM and the SFWEM are desired to eliminate premature condensation in the DM's inlet manifolds and ports, a common liquid coolant loop results in minimum components and controls. 70PDF Image | WATER ELECTROLYSIS MODULE
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