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Coolant Flow M = molecular weight of gas (02 or H2) P (g) = partial pressure of water vapor in gas over electrolyte at cell temperature and concentra- tion existing in gas compartment in consistent pressure units. Pt(g) = total pressure of gas and water vapor in gas compartment in consistent pressure units. The required coolant water flow rate can be calculated from the amount of heat to be removed from the SFWEM and the desired temperature rise in the coolant flow(approximatelyequivalenttodesiredmoduletemperaturegradient). Figure 5 shows this relationship graphically for water as the coolant. The amount of heat generated within the module and needed to use Figure 5 must first be deter- mined from Figure 6. Conductive or evaporative heat losses, if significant, must be subtracted from the cooling load before entering Figure 5. Module Design In the design of the SFWEM major emphasis was placed on avoiding the problems and limitations identified in the survey of water electrolysis modules and systems. The resulting cell configuration is shown, in a cross-section form, in Figure 7. Table 2 identifies the numbered items shown on the figure, including materials of construction of the individual cell components. Cell Configuration As shown in Figure 7, each of the cells has four cavities: (1) the 0 cavity, (2)the H cavity, (3)the water feed cavity, and (4)the liquid coolant cavity. Intercaviiy sealing is achieved by squeezing the cell and water feed matrices between the polysulfone frame components forming the 02 and H2 and 02 and water feed cavities, respectively. The cell frame and anode curren? collector provide passages for the liquid coolant. The cell cavities are internally manifolded. The cavities of each type of fluid are connected in parallel while the cells are connected electrically in series. The manifolding arrangement for the cells are also shown in Figure 7. The major features included in the cell design are: 1. Isolation of all feed water inlet and feed water cavity fluid circula- tion ports from metallic components. 2. Calculatedsizingofwaterfeedcavitymanifoldsandportstoprevent air bubble blockage. 3. Low H2 cavity thickness to decrease diffusional resistance to water vapor. .21 Li/c SYstcrwS, nc.PDF Image | WATER ELECTROLYSIS MODULE
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