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the range in operating conditions of the module during the testing. A total of 94 days (2256 hours) of endurance testing were accumulated during this phase of testing. Adding the shakedown and parametric test times to the endurance test time resulted in 111 days (2664 hours) of accumulated operation for the SFWEM and the STS. Cell/Module Voltage. Figure 27 shows the variations in cell and module voltages as a function of current density for the 94 days of operation. The variation in module and maximum and minimum cell voltages during the first 440 hours of opera ion were a result of the manual variations in curre9t density from 216 mA/cm (200 ASF) during normal working hours to 107 mA/cm (100 ASF) during the remainder of the time. These variations were performed to enable actual observa- tion of module performance at higher current densities for extended periods of time to establish a current density level for the remainder of the endurance test. The current density and resulting voltage spikes near 440 hours were caused by a capacitor malfunction in the current controller which resulted in a s owly increasing current density level from 108 mA/cm (100 ASF) to 570 mA/cm (530 ASF) over a period of about 20 hours. Following replacement of the capacitor, cyc ic current density operation was stopped and testing at a constant 161 mA/cm (150 ASF) was continued for the remaining 1816 hours of the endurance test. During this time period the average voltage level was 1.65V, with an average spread of 50 mV between the lowest and the highest of the six voltages. A net rise of only 0.083 mV/cell/hour was observed during the first 200 hours of the constant current density operation, with basically constant average voltage observed for the remaining 1616 hours of testi g. The average cell voltage of 1.65V observed during the constan 161 mA/cm (150 ASF) operation bettered the design goal (1.70V at 161 mA/cm (150 ASF)) by 50 mV/cell. Degassing Requirements. The endurance test was started at a pressure of 1724 kN/m2 (250 psia), based on the analytically projected value required to eliminate feed water cvity degassing. This pressure level, including several excursions to 2069 kN/m (300 psia), was maintained for the first 440 hours of endurance testing. Periodic checks for the accumulation of gas in the cells' water feed cavities were performed using the GSU described earlier. No water feed cavity gas buildup was detected during this period. The average current density during this period of operation was 129 mA/cm (120 ASF). To identify the lowest practical pressure level where zero legassing requirements would exist, the operating pressure was lowered to 517 kN/m (75 psia) and maintained at th t level for a period of 1245 hours. The current density was set at 161 mA/cm (150 ASF) based on the cyclic test results described above. Gas accumulation was observed for these conditions and the amounts were quantified. Typical results for a portion3of this test are shown in Figure 28. Based on the data, approximately 0.0033 cm of gas were liberated per gram of feed water 61 Ci/c Sstcms, JNc.PDF Image | WATER ELECTROLYSIS MODULE
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