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GT056019-0150 TC1 Hold - 23/Jun/10 28cell PCI; Test Stand 1 Constant V vs I Furnace control failure and fir Uncontrolled (E-stop) SSR e shutdo Shaded Blue = Constant Voltage Regions wn UPS failure and uncontrolled (E-stop) shutdown Step change in flow to correct utilization If changes in this pseudo ASR can be accepted as a qualitative assessment of degradation then: the mechanism and rate of physical degradation is roughly the same for constant voltage and constant current operation. Test Conditions: 750 °C outlet temperature 47 A (0.39 A/cm2) or constant V - 28 cells 49.5 g/hr H2 production at 47 A Oxidant side : air - 35 slpm flush at all conditions Fuel side: 2% H2, 48% N2, 50% H2O, 50% steam utilization (manual step corrections as necessary) Psuedo ASR calculated as (V-OCV)/I Not a true ASR due to utilization impact and because it ignores activation & diffusion characteristics. 0 1000 2000 3000 4000 5000 6000 Elapsed Time (hours) Copyright © 2011 Versa Power Systems – All Rights Reserved Pseudo ASRPDF Image | Reversible Fuel Cells Workshop Summary Report
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