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LiOH Lithium hydroxide MetOx Metal oxide PLSS Portable life support system PSIA Pounds per square inch (absolute) RCA Rapid cycle amine SA9T Hamilton Sundstrand proprietary solid amine sorbent formulation SEV-I Single-end vacuum generation on inlet side SEV-O Single-end vacuum generation on outlet side SLM Standard liters per minute TA2 Test article 2 VSA Vacuum swing adsorption Variables a,ao Parameters for Toth isotherm, [m3/kg SA9T] Acs Cross-sectional area, [m2] b,bo Parameters for Toth isotherm, [m3/kmole] co Parameters for Toth isotherm, [K] Cgas Overall gas concentration (sum of component concentrations), [kmole/m3] Ci Concentration of component i, [kmole/m3] Ci∗ Concentration of component i at equilibrium, [kmole/m3] Cp,i Specific heat of component i, [kJ/(kmole·K)] Cv Valve coefficient, [unitless] Dp Mean particle diameter of sorbent beads, [m] DL Dispersion coefficient, [m2/s] Ei Isoteric heat of adsorption for component i, [kJ/kmole] hw,g Heat transfer coefficient for wall-gas, [kJ/(m2·s·K)] K Thermal conductivity, [kJ/(m·s·K)] k Isentropic expansion factor, [unitless] ki′ Mass transfer coefficient of component i, [1/s] mi Mass flow rate of component i, [kg/min.] Mwi Molecular weight of component i, [kg/kmole] Ni Moles of component i, [kmole] P Pressure, [PSIA] -or- [bar] Pvap Actual vapor pressure, [mm Hg] P∗ Saturated vapor pressure, [mm Hg] vap Q Volumetric flow rate i, [m3 /s] qi Loading of component i, [kmole/kg SA9T] qw Conductive heat transfer through wall, [kJ/(m3 ·s)] r Radial spacial coordinate in cylindrical geometry, [m] ro Inner radius of annulus, [m] -or- Toth isotherm parameter, [unitless] rf Outer radius of annulus, [m] Re Universal gas constant (energy units), 8.314472 [kJkmole−1 ·K−1 ] Rg Universal gas constant, 8.314472×10−2 [bar·m3 ·kmole−1 ·K−1 ] RH Relative humidity fraction, [unitless] SG Specific gravity, [unitless] T Temperature, [K] -or- [◦F] t Time, [s] -or- Toth isotherm parameter [unitless] 14 of 15 American Institute of Aeronautics and AstronauticsPDF Image | Vacuum Swing Adsorption Units for Spacesuit Carbon Dioxide and Humidity Control
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