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Ci/c Systems, ic. mA/cm2 (1000 ASF) which verified the electrical design (low IR losses) and electrochemical design (able to sus ain high current density operation) and (2) pressures from ambient to 1724 kN/m (250 psia) which verified the mechanical structure and electrical contact designs. Parametri5 testing of the SFWEM demonstrated cell performance of 1.78 volts at 538 mA/cm (500 ASF) and 366K (200F). Cyclic on-off operation for five days resulted in improved performance of 20 mV ?er cell. Additional parametric tests covered operating pressure up o 1724 kN/m 2(250 psia), and process fluid differ- ential pressures from -34 kN/m to +34 kN/m (-5 psid to +5 psid). An endurance test which lasted 94 days (2256 hours) was successfully completed on the SFWEM. A total test time of 111 days (2664 hours) were accumulated on the SFWEM including shakedown and parametric tests. The endurance test demon- strated that the SFWEM design has eliminated eed water cavity degassing require- ment by operating for 440 hours at 1724 kN/m (250 psia) and 488 hours at 807 kN/m (117 psia) without gas accumulation or cavity venting. The remaining 1328 hours were devoted to identifying operating conditions at which cavity venting begins. Short-term tests were performed on a single cell at ambient pressure and a 327K (130F) temperature which identified an electrode wish better performance (34 mV lower internal resistence free voltage at 215 mA/cm (200 ASF) and2a matrix which has better performance (58 mV lower terminal voltage at 215 mA/cm (200 ASF), and has better high temperature capabilities. Endurance testing of the high performance electrode and high temperature testing of the new matrix is now required. A Dehumidifier Module (DM) was successfully designed, fabricated, and tested. The module removed the moisture from the SFWEM product gas streams by absorbing it into sulfuric acid (H2SO4) electrolyte and subsequently electrolyzing it. This eliminates the need for subsystem condensor/separators and produces additional 0 and H . The module design was similar to the SFWEM except (1) the water feed cavity was eliminated, (2) there were only three cells, (3) it was designed to run at lower current densities (54 mA/cm (50 ASF) maximum), and (4) it used acid-compatible materials. The DM accepted the total SFWEM 02 and H2 flows and reduced their dew points to 287K (57F) or below. The DM test system was designed, fabricated, and successfully used to operate the DM. A limited characterization test was completed which demonstrated the performances exceeded the design goal of 1.90V per cell by 0.2V per cell, indicating fewer than the three cells per one man 02 capacity SFWEM would be needed. INTRODUCTION Technology and equipment are needed to sustan man in space for extended time periods. The objective of this program was to develop an advanced Static Feed Water Electrolysis Module (SFWEM) and associated instrumentation to generate breathable oxygen (0 ) through the electrolysis of water with the byproduct hydrogen (H2) availaile for use in an Air Revitalization System (ARS) for the recovery of 02 from metabolic carbon dioxide (CO2). 2PDF Image | WATER ELECTROLYSIS MODULE
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