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DM Hardware Design and Operation The basic cell design used for the SFWEM was adapted to the design of the DM. The injection molded polysulfone cell parts, being compatible with the acidic environment were directly applicable. Materials changes in the remaining cell components were, however, required. Also, a reduction from the four process fluid cavities to three (no feed water cavity) was necessary. The resulting cell cross-section schematic is shown in Figure 31. Critical components of the cell are the cell matrix and electrodes where water decompo- sition takes place. The cell matrix, Item 2, is the area where the H SO electrolyte is retained. It is supported on the 0 side by a porous TI anode (Item 3) and on the H side by a screen electrode Item 1). Hydrogen comes into the H cavity (Item 45 which is created by Ti expanded metal. Water vapor is absorged by the H2SO4 contained in the electrode where it is electrolytically decomposed by the current passing through the cell. The H2 evolved goes back in the H2 cavity and is carried out into the H2 manifold. A similar process occurs in cavity five where saturated 0 comes in, relinquishes its water to the cell matrix and dry 02 is evolved bac into the 02 cavity where it is collected in the 0 outlet manifold. Shown also in the schematic is the bipolar connection with ihe current flow indicated. Three of these single cells are sandwiched in between polysulfone insulation plates. The insulation plates are then retained by stainless steel endplates. Dehumidifier Capacity The DM was designed to reduce the dew point of the product gases from the SFWEM to less than 287K (57F), which is considered maximum for a spacecraft atmosphere. To meet this requirement, the DM must be operated at the proper current level to electrolyze the incoming water vapor contained in the product H2 and 02. If the SFWEM generates 0.907 kg (2 lb) of 02/day, then, stoichiometrically, 0.1134 kg (0.25 lb) of H2 are generated. Since the generation rates and approximate humidity ratios of the gases are known, the amount of water that must be electro- lyzed can be calculated and the required DM current can be determined. DM GROUND SUPPORT ACCESSORIES The schematic for the GSA designed for testing the DM is shown in Figure 32. The function of the GSA is to simulate the H2 and 02 exhaust gas streams from the SFWEM while the DM is being tested independently. As shown in Figure 32, bottled H2 and 02 are fed into the system and bubbled through humidifiers (Hl and H2). The dew points of the gases are controlled to the desired level by adjusting the humidifier water temperatures. Provisions are available i'bypass the humidifiers so that the water supply may be replenished (HV7-HV10). The gases then flow past temperature sensors (TC1 and TC2) and dew point sampling ports into the DM. The H2 enters the cathode cavity and the 02 enters the anode cavity. The 02 generated at the anode mixes with 02 ih the anode cavity and the H2 generated at the cathode mixes with the H2 in the cathode cavity. :The gases flow past pressure sensors (PG3 and PG4), temperature sensors 71 £ile Sgstcms, fJc.PDF Image | WATER ELECTROLYSIS MODULE
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