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5.3 PERFORMANCEDATAANDANALYSIS 5.3.1 ElectrolysisModule Performance A summary plot of voltage/current data for all of the electrolysis modulesisshowninFigure31. (Moredetailedplotsareincludedin AppendixA). Valuesshownareweeklyaveragesinhighcurrentmodeexcept forModule4,whichremainedinlowmode. Notethatdiscretedatapoints have been spanned with continuous lines for the purpose of illustration of trends; in actual operation, the current was cycling high/low/off (12/45/0A)dependingonthetestcondition. Duringthefirst13weeks of the test, the high current mode duty was 62% of a 100-minute cycle. Orbital (on/off) operation occurred from the middle of the 15th to the middleofthe16thweek. Theoxygenoutputwasrampedfrom3.63to4.55 kg/dayin0.23kg/dayincrementsduringthe17thweek. The4.55kg/day rate was maintained for five weeks (19th-23rd). The last three weeks of the test, the oxygen output was reduced back to the nominal 3.63 kg/day. It is apparent from Figure 31 that the electrical performance of all of the modules was stable, regardless of test conditions. Some fluctua- tion in current is evident with Module 4B showing the greatest variation, but in no case is the current out of control. All of the module voltages showaslightupwardtrend. TheeffectismostpronouncedinModule1 containingthe experimentalanodes. The effect of the voltage increase on system power requirements is discussed in Section 5.3.2. The experimental anodes in Module 1 were strictly of development status. Eachonewashandmadeinthelaboratorywithoutformalprocess specifications. Therefore, quality control and uniformity were difficult toachieve. Theonlystandardwhichwasestablishedwasanarbitrary maximum of one percent organic extender residue after post treatment, as determinedby thermo-gravimetricanalysis (TGA). Processing and performance data for these electrodes are given in Table 7. The electrodes are numbered in the sequence in which they were made. The cell number in Module 1 in which each was used during the182-DayTestisindicated. Electricalperformanceatthebeginning, 76PDF Image | WATER ELECTROLYSIS SYSTEM REFURBISHMENT
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