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(A) Heat Heat Bed B1 Heat Bed A2 Heat Bed B2 Bed A1 Suit Air Inlet N2, O2, CO2, H2O (B) Suit Return CO2, H2O deplete Vacuum CO2, H2O rich (C) Figure 1. (A) Illustration of RCA operation and flow direction for the (B) full-scale rectangular RCA and the (C) sub-scale cylindrical RCA test articles. The illustration in (A) represents operation with the ‘A’ beds undergoing vacuum regeneration and ‘B’ beds undergoing adsorption. order to maintain equivalent test article residence times. Current requirements for the maximum inhaled CO2 concentration are established at 7.6 mm Hg for metabolic rates up to 469 Watts (1600 Btu/hr) and 15 mm Hg for metabolic rates exceeding 469 Watts.1,7 As has been performed in previous analyses,1,7 the valve(s) diverting flow between adsorbing and desorbing layers was actuated at an outlet partial pressure of 6.0 mm Hg of CO2. This value was chosen as it provides an extra buffer to ensure the critical concentration is not reached while the volume of accumulated CO2 is washed out of the test loop following valve actuation. Vacuum regeneration was performed through a variety of scenarios: (1) a vacuum was pulled on both the inlet/outlet of the RCA simultaneously in the dual-end desorb (DEV) configuration, (2) vacuum was pulled on the inlet of the device in the single-end vacuum inlet (SEV-I) configuration, or (3) vacuum was pulled on the outlet of the device in the single-end vacuum inlet (SEV-O) configuration. III. RCA Predictive Model A predictive model for the RCA test articles and associated test loop (fig. 2) has been generated and is summarized in table 2. In order to establish this model, a few broad assumptions were employed. 1. Cross-sectional variations in gas temperature, pressure, concentration are negligible. Conversely, vari- ations in the flow direction are significant. As a result, one-dimensional plug flow with axial dispersion becomes a suitable approximation for component material balances, eq. 1. 3 of 15 American Institute of Aeronautics and AstronauticsPDF Image | Vacuum Swing Adsorption Units for Spacesuit Carbon Dioxide and Humidity Control
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