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3.2.8 Discussion of Net Work for the Four-Step Cycle When we add up the work done by the system in each step, we find the net work done by the system in separating the gases. When we plot this net work (Equation (3.60)) per mole of product oxygen for various values of PL and n, we obtain results of the form given in Figure 3.13. nw Figure 3.13 Four-Step Cycle: Net Work perMole ofProduct Oxygen (1U4) Done by System (yo = 0.78, 0=0.582). This shows the work required to produce 1 mole of species B as a function of PL and n for our base case of oxygen concentration (yo = 0.78 and (3 = 0.582). Positive work is defined as work done by the system, so the values in this graph are negative. The low pressure varies from 0.2 arm. to 4 arm., while the pressure ratio varies from 7 to 25. At low values of pressure ratio, the net work required for the cycle increases dramatically 72PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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