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The Multiple-Cell model developed has confirmed the semi-analytical model results. The model was capable of representing diffusion by decreasing the number of cells used. The following conclusion can be drawn from the analysis: 1. Decreasing the number of cells did not change the second law efficiency greatly, indicating that the sharpness of the concentration wavefront during the feed step does not change the bed losses. Although the models developed have used linear isotherms, it is expected that the results will not vary much with the use of non-linear isotherms. Non-linear isotherms, especially those that are favorable (concave down) are expected to increase the benefits of lower pressure ratios. The Multiple-Cell model is capable of testing this theory. The models also assume isothermal conditions. As the operation of the beds and the compression and expansion becomes adiabatic (which usually occurs with larger systems) the work required per mole is expected to increase and the second law efficiency is expected to decrease. This would be consistent with the general degradation of pressure swing adsorption cycles as heat effects are introduced. However, the general trends are expected to remain the same. If the assumption of equilibrium were relaxed, it is assumed that the second law efficiency would decrease for all of the cycles studied. 145PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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