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can be performed.(3) Practical limitations as to current levels and cell size dimensions will normally govern final module sizing. High current density and large active areas, for example, may result in excessive current levels causing high IR losses and increased equivalent system weights. The SFWEM was designed for a range in 02 generation rate of 0.680 to 0.907 kg/d (1.5 to 2 lb/day) while m intaining the ac ive area of each individual cell between 92.9 and 185.8 cm (0.1 and 0.2 ft )2 It was2designed to have six cells, each having an active area of 92.9 cm (0.1 ft ). The resulting current level is 21.2 amps for an 022generation rate of 0.907 kg/d (2 lb/day) at a current density of 227 mA/cm (211 ASF). The dimensions of the active2area are 11238x8.20cm(4.48x3.23in). Thisresultedinanareaof92.9cm (0.1 ft ) when including the effects of corner radii. Nominal Design Point The nominal design point for the SFWEM was selected to e an 0 generation rate of 0.907 kg/d (2.0 lb/day) while operating at 1724 kN/m (250 isia) and 352K (175F) with an electrolyte concentration of 35% KOH (by weight). Based on analytical considerations, the need for condenser/separators and for feed water cavity degassing would be eliminated at these conditions. Detailed mass and heat balances for the SFWEM itself and for the total test system at the nominal design point were performed and are presented in Figures 3 and 4, respectively. Fluid Flow Calculations For operation at other than nominal design point, the flow of the four process fluids (0 , H2 , water, and coolant) interfacing with the SFWEM can be readily calculatei based on Faraday's Law and standard humidification and heat balance equations. Oxygen Flow The flow rate of 02 can be calculated as a function of current flow by the equation: where -4 mi =2.98x10 IN (4) 2 m02 = flow rate of 02 generated, kg/h I = current flow through cells electrically connected in series, A N = number of series-connected cells Hydrogen Flow The flow rate of H2 can be calculated as a function of current flow by the 17 Li/f Systekts, rnc.PDF Image | WATER ELECTROLYSIS MODULE
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