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wF =33,411 J/mol 0 2 (78.37%) WE2 = 9222 . (21.63%) WEI = 11,862 J/mol O2 (27.82%) WPR= 17,490 J/mol 0 2 (41.03%) ]>wR =2995J/mol02 (7.03%) VJ/P= 4005 J/mol O2 (9.39%) \|/B= 510 J/mol O2 (1.20%) ed Loss = 5771 J/mol O2 (13.54%) Figure 4.19 Grassman Diagram for Run 5 (Kayser and Knaebel, 1986). The pressure ratio in all of these runs was changed by varying the lower pressure of the cycle. The net work and second law efficiency of the Ideal Four-Step analysis does not depend on the lower pressure, but only the pressure ratio. Therefore, in summarizing the results of this analysis, we shall do so with respect to the pressure ratio. As the pressure ratio increases, the following conclusions can be drawn: 1. Both the recovery and productivity increase. 2. The total work input per mole of desired product decreases. 3. The net work required by the system per mole of desired product decreases. 4. The second law efficiency increases; increasing the pressure ratio from 6.48 to 23.54 increases the second law efficiency from 14.5% to 36.3%. 5. The bed losses decrease by over a factor of four between the first and last runs. 125PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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