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£i/c Systkcs, Inc. screw fastens the cathode current collector frame onto a post, which was resistance- welded to the anode current collector of the adjacent cell, to provide the electrical conduction path. Sealing between the liquid coolant compartment and the H2 compartment required around the current post was achieved by a single 0- ring. Four such locations for current conduction were provided per cell, one at each of the four corners of the cathode current collector frame. Fluid Manifolding Particular attention was paid to manifolding of the five different fluids that flow into, through, or out of the SFWEM. These fluids were: (1) feed water, (2) liquid coolant, (3) N2 for purge, (4) generated 02, and (5) generated H2. To prevent loss of current efficiency through intercell electrolysis accompanied by an accumulation of gases in the water feed manifolds and cavities, the electrolyte in the feed water cavity and the water feed system were isolated from all metallic components within the module. This isolation was achieved by using polysulfone manifold covers with raised surfaces extending through the metallic current collectors, thus providing polysulfone-to-polysulfone contact and isolating the electrolyte from the Ni current collectors. Passage of the electrolyte and water feed through the stainless steel endplates constituted an additional area where intercell electrolysis or gas generation could occur. This problem was solved by designing access ports to the liquid compartments lined with polysulfone sleeves and sealed with a modified O-ring seal fitting. A section of the typical liquid pass-through through an endplate is shown in Figure 9. Figures 10 through 13 show sections through the manifolding regions representa- tive of coolant inlet or outlet, water feed and electrolyte inlet or outlet, N2 inlet or 02 outlet, and N2 inlet or H2 outlet, respectively. Manifold covers were only required for access to the Internal cell compartments, i.e., H2 and water feed compartments. The embossed surface that passed through the anode current collectors on the manifold cover for the H2 port was included, although not required, for isolation from the metallic surfaces, to enable use of common- ality manifold covers. All fluid manifolds and ports were located in a geometrical arrangement to enhance fluid passage through the rectangular active cell area, i.e., inlet passages were located diagonally opposite the outlet passages. Module Fabrication Each of the SFWEM's six cells consisted of eight polysulfone parts; cell frame, compression frame, internal water feed cover, and five fluid manifold covers. As part of the program, an evaluation was performed to compare standard machining techn Ius with injection molding for the plastic parts. The results of the study showed that it was more cost-effective to use the injection molding technique for the plastic cell parts when considered over the complete development time frame. Each cell also had two gold-plated Ni current collectors, the anode and the cathode frame. These parts were fabricated using standard machining 28PDF Image | WATER ELECTROLYSIS MODULE
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