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TABLE 1. - NOMINAL DESIGN SPECIFICATIONS FOR NASA LEWIS PREPROTOTYPE 1-kW REDOX STORAGE SYSTEM Gross power, W• • • • • • Nomlnal net power, W• • • • • • • Voltage, Vdc •• • • • • Numberofstacks•••• •••• •••• Number of cells per stack ••••••••••• • • • • • Number of trlm packages (6 cells each) • • ••••••••••• 10 Depth-of-dlscharge range (utlllzatlon) • • • • • • • • • • • 80$ - 20$ (0.60) Reactant volume (each), llters (U.S. gallons) Reactant energy denslty (end of llfe), Wh/llter Cellactlvearea,cm2 •••••••• •••• Nomlnal current denslty, mA/cm2 •••••••••••••••••• 30 Reactants ••••••••••••••••••• Reactant flow rates (nomlnal), cm2/mln cell Parasltlc losses, W: Pumps • • • • • • • • Shunt power • • • • • Number of rebalance cell~ Number of charge-lndlcator cells. TABLE 2. - REDUCTION OF SHUNT-CURRENT LOSS (TAPER DESIGN CHANGES: FIVE-CELL STACKS, 1.20 Conf1guratlon Orlg1nal B1polar-plate man1fold holes 1nsulated from flulds Membrane man1fold holes 1nsulated from tlUldS Membranes 1nsulated from flu1ds 1n port slots Mathemat1cal model TABLE 3. - PARASITIC LOSSES FOR PREPROTOTYPE 1-kW REDOX STORAGE SYSTEM Pumps Shunt currents Instruments and controls Measured 120 (max.) 230 (max.) 100 Deslgn est1mate Loss, W 120 120 • • • • • • • • • • • • • • • • • • • •••• 1260 ••••• 1000 •••120±5% • • • • • •• 700 (186) ••••• 14.5 •••••••• 320 • 1 Mil FeC13, 2 NHCl 1 Mil CrC12, 2 NHCl • • •• 100-150 .120 (15$efflclency) 120 5 1 CURRENT) BY CELL VICELL Taper current, rnA 2000 140 28 12 7 ---------- •••4 • •• 39PDF Image | NASA Redox Storage System Development Project 1980
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