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Evacuation Work Input, WE2 1737J/mol 02 / Exhaust Availability, YJ/E Figure 4.11 Grassman Diagram for the Ideal Three-Step Cycle. 76,998 J/mol (100%) Pressurization, WPR 15,938J/mol 02 (20.70%) Expanding Product, WR 6925 J/mol 0 2 (8.99%) Product Availability, vj/p 3816 J/mol 0 2 (4.96%) Bed Loss 5500 J/mol 0 In this diagram, the evacuation work has been broken up into two parts: WEI represents the work recovered during the evacuation step as the pressure falls from PH to Po and WE2 represents the work required during the evacuation step to remove the gas as the pressure falls from Po to zero. For this reason, WE2 is shown as an energy input to the system. When this diagram is compared with the Grassman diagram for the Ideal Four- Step cycle (Figure 4.7), we can see that the work input required to effect the same product availabiHty is much less for the Ideal Three-Step cycle. The bed losses are also much less for the Ideal Three-Step cycle. As we know, the performance of the Four-Step 2 Evacuation, WEI 44,318J/mol 02 (57.56%) v 502 J/mol 0 2 (7.14%) (0.65%) 113PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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