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Experimental Experimental Simulation Simulation Figure 6. 8-hour variable metabolic profile experimental (top panel) and simulation (bottom panel) results for a 110 ALM flow rate. E. Geometrical Considerations in VSA System Design The experiments to date have resulted in the generation of a copious amount of data to characterize the performance of both rectangular and cylindrical RCA designs. It is the goal of these exercises to determine whether the geometry can significantly influence performance. A direct comparison of the data collected is not exactly possible for a two primary reasons. (1) The rectangular and cylindrical test articles had drastically different valving systems. The rectangular unit has a spool valve which could be plumbed to the vacuum chamber with relative ease. Currently, the cylindrical test article did not have a dedicated valve but instead relied upon a series of 8 solenoid valves to direct flow. The solenoid valves required a decrease in tubing diameter from the vacuum chamber to the test articles to interface with the RCA unit. Additionally, the solenoid valves resulted in plumbing that had several bifurcations between the vacuum chamber and test article. Consequently, the pressure drop between the vacuum chamber and test articles was not equivalent for both series of tests and may have influenced the results. (2) The interior design of both test articles (i.e. flow manifolds and plenums) presumably result in significantly different pressure drop throughout the competing geometries. Although the pressure drop through the porous media was considered in the development of the 1D predictive models, the models currently lack the sophistication required to effectively analyze 3D pressure variations within the ullage volume of the RCA units and the associated influence this might have on vacuum desorb performance. Consequently, these factors may have served to confound the results rendering a direct comparison dif- ficult. Alternatively, a predictive model has been generated and correlated to experimental data for both 11 of 15 American Institute of Aeronautics and AstronauticsPDF Image | Vacuum Swing Adsorption Units for Spacesuit Carbon Dioxide and Humidity Control
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