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Space Station Freedom (SSF) is required to distribute water for use and reprocessing. As SSF is erected, the configuration of the water distribution system changes along with specific functions. Therefore the interaction of the various components changes radically. Also, these components are taken off-line intermittently for maintenance (such as filter replacement). In order to analyze these interactions, a simplified steady state computer model was prepared. Parameters such as set points and storage tank capacities were revised based upon new performance understanding. The model was built using a Lotus 1-2-3 program. The model, making extensive use of macros, was iterated over thousands of hours of simulated SSF water processing in orbit. The data was stored and plotted. With the aid of the results of this modeling, the flight design was refined to a high level of maturity.

General plans for testing of a regenerative ECLS system in a Module Simulator at MSFC have been been discussed in a previous paper; preliminary test results are given in this paper and a companion by Mr. McAlister. Subsystems for this series of tests have been provided by Life Systems, Inc., AiResearch Manufacturing Co., Umpqua Research Company, Lockheed, and Hamilton Standard. Results of testing those subsystems provided by Hamilton Standard are covered in the other paper. Subsystems have been installed in the Module Simulator in accordance with the test plan. These include the 4-bed Molecular Sieve, the Static Feed Water Electrolysis Subsystem, and the Urine Pretreatment/Mixing Unit to be covered herein.