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middle, and end of the test in high current mode is presented. The last two columns of data show the TGA analysis and the number of post-treatment operations that were required to reach the acceptable TGA level of 1.0%. There appears to be no correlationbetween TGA percent residue and the electricalperformanceinthisrange. Cell2A,containingelectrodeA8, exhibited the highest voltage, which may have resulted from mechanical degradation in post-treatment. This electrode required 4 leachings, more than any other electrode, to reach the TGA standard. It is also apparent that a "learning curve" was involved. The last six electrodes in the series showed a very consistent voltage grouping which was probably the result of gradual improvements in the processing and post- treatment techniques. A summary plot of electrical performance of Cells 2A and 2B is showninFigure32. EvidentinthisFigureisthetypicallargevoltage increase during the first few hundred hours of continuous operation, recovery to approximatelythe initial voltage after shutdown, and eventual stabiliza- tionatavoltagelevelcharacteristictothatparticularelectrode. For Cell 2A, the "stable" voltage was approximately 2.4 volts and for 2B, the stable voltage was approximately 2.0 volts. 5.3.2 EnergyRequirements The energy requirements of the system at various operating conditions andasafunctionoftime,areshowninFigure33. Thelowercurveshows theenergyperkilogramofoxygenrequiredbytheelectrolysismodules. The increment added for the power controllers is represented by the middle curve andshowsa70-75percentconversionefficiencyforthesedevices. Theupper curve is the total energy expended per kilogram of oxygen and includes accessory input for solenoid valves, light bulbs, control logic circuits, and the electro- lyte pump. Module performance degradation at 3.53 kg/day showed a rate of approximately 5 percent with Module 1 included and only 2 percent without Module1. Performancedegradationrateat4.55kg/daywasnotsubstantially differentfromthe3.63kg/dayrate. However,thespecificmoduleenergy consumptionwasapproximately5percenthigher. Moduleenergyrequirements 79PDF Image | WATER ELECTROLYSIS SYSTEM REFURBISHMENT
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