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V List of Symbols and Abbreviations XI vads VB VCMS vg vgas VR VT wk wk* ws0k, b0k, n0k, αk, χk, Qk wsk* wtotal X X̄ xi yi yk zk δexp δsim Δg Δhads, ΔHk Δhv Δp, ΔP ΔT Δs Δv εB εi εP θ = wk*/wsk* μ, μ0 π ρg ρi ρs σ σX̄ Φ ψ Ω ∂w/∂t ASU CMS, MSC CSS CVD adsorbate phase molar volume [m3/mol] bottom-void volume [cm3] total packed-bed density in PSA system [m3] gas phase superficial velocity [m/s] gas molar volume [m3/mol] product receiver volume [L] top-void volume [cm3] loading of component k [kmol/kg] equilibrium loading of component k [kmol/kg] Sips isotherm parameters of component k saturation equilibrium loading of component k [kmol/kg] total adsorbent loading [kmol/kg] purge proportionality factor [-] mean value gas mass fraction in stream i [kg/kg] gas molar fraction in stream i [kmol/kmol] mole fraction of component k in the gas phase [kmol/kmol] mole fraction of component k in the adsorbed phase [kmol/kmol] relative error between PIs determined experimentally [%] relative error between PIs computed in Monte-Carlo method [%] change in Gibbs free energy [J/mol] heat of adsorption of component k [J/mol, kJ/mol] heat of evaporation [J/mol] change in pressure, pressure difference [Pa, bar] change in temperature [K] change in entropy [J/mol/K] change in molar volume [m3/mol] total bed voidage [m3(void+pore)/m3(bed)] interparticle voidage [m3(void)/m3(bed)] intraparticle voidage [m3(pore)/m3(pellet)] adsorbent surface coverage [-] chemical potential, reference chemical potential [J/mol] spreading pressure [N/m] gas phase molar density [kmol/m3] gas density in stream i [kg/ m3n] solid phase bulk density [kg/m3] absolute uncertainty value percentage uncertainty of the mean value relative error between experimental and simulated PIs [%] adsorbent pellet shape factor [-] parameter dependent on half-cycle time [-] mass transfer rate [kmol/kg/s] air separation unit carbon molecular sieve, molecular sieve carbon cyclic-steady-state chemical vapour depositionPDF Image | Modelling and Simulation of Twin-Bed Pressure Swing Adsorption Plants
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