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Background Past development efforts on water electrolysi4sMtems and modules have included those that use the static water feed concept Systems using this concek 6) have demonstrated an inherent simplicity and long operating life capability. The Static Feed Water Electrolysis Subsystem (SFWES) has the most potential as the lowest p?)yr-consuming electrolysis system due to its use of an alkaline electrolyte.Ty? Various approaches to SFWES designs by different developers and results of extensive test programs have identified key system improvements required Problems inherent in the design of a SFWES and of water electrolysis systems in general, have been eliminated as demonstrated by. * elimination of water feed compartment degassing(5) * elimination of the zero gravity condenser/separators which are characteri c of all other applicable water electrolysis - subsystems- * elimination of aerosols in the product gas stream(l) A reliable, low equivalent weight OGS based on the static feed concept and including peripheral support hardware has been under development at Life Systems, Inc. (LSI) for the past several years. The currently developed SFWES has demonsrated a capability of operating with current densities of 54 to 1080 mA/cm (50 to 1000 ASF), pressures from ambient to 4140 kN/m (600 psla) and internal temperatures from 323 to 372K (120 to 210F). The requirement of past SFWESs to vent the feed water cavity has been solved A 90-day endurance run was completed successfully and two approaches to delivering dry product 02 and 11Ig2ases tS the spacecraft environment and other ARS subsystems were demonstrated. One approach was gas expansion through a regulator, the second was an electrochemical Dehydrator Module (DM) in the product gas lines. The objective of the present program is to continue to advance the technology of the SFWES with special emphasis on improving performance (lower cell voltages at higher current densities), customizing components inherently needed by the SFIES and reducing overall subsystem complexity in preparation for integration into a spacecraft's ARS. Program Objectives The general program objective is to advance the technology of the SFWES The detailed overall objectives of the program are to 1. Designamodulethatcanreliablyoperatefor180dayswithalife time of 2 5 years or more. 2. Advancethetechnologyasfaraspossiblewithoutriskingtheoverall system design on such an advanced concept that might prevent successful completion of the parametric and endurance test programs 3 i/C Systms, nc.'PDF Image | STATIC FEED WATER ELECTROLYSIS PROCESS
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