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Po = atmospheric pressure = 101325 Pa PA = partial pressure of species A in the gas phase {Pa} PB=partialpressure ofspeciesB{Pa} PH = high pressure limit of the cycle {Pa} PL = lower pressure limit of the cycle {Pa} R = universal gas constant = 8.3144 J/mol K SAO= molar entropy of species A at state (0) {J/mol K} SAI = molar entropy of species A at state (1) {J/mol K} T - temperature {K} To = reference temperature {K} t = time {s} tB = time for the leading edge of the simple wave to reach the entrance of the bed during purge {s} tc = time for point C on the concentration wavefront to travel the length of the bed {s} tF = time for the shock wave to just reach the end of the bed {s} tpu = time required for the purge step {s} u = interstitial gas velocity {m/s} ui = velocity at point 1 in the bed or at the entrance of the bed {m/s} ui(t) = velocity at the entrance of the bed during the purge step {m/s} U2= velocity at point 2 in the bed or at the exit of the bed {m/s} uc = velocity of point C on the concentration wavefront {m/s} us = velocity of the shock wave at constant pressure {m/s} V = volume {m3} VB=ALB=totalvolumeoftheadsorbent bed{m3} VFI = volume of the feed piston at atmospheric pressure {m3} VF2= volume of the feed piston at the beginning of Step 2-3 of the feed step{m3} Vp2 = volume of final amount of product gas (Np2) at the high pressure {m3} Vp3 = volume of final amount of product gas (Np2) at atmospheric pressure {m3} Vpu = volume of light gas used to purge the bed at P = PL {m3} Vwi = volume of the purged gas at the low pressure {m3} Vw2 = volume of the purged gas at atmospheric pressure {m3} WB = work done by the system as the blowdown gas leaves the system {J} WBI = work done by the system as the blowdown gas leaves the system (P>Po) {J}PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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