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5.3 Multiple-Cell Model Results The multiple cell model was programmed in visual basic. For the changing pressure steps (blowdown and pressurization), the solution algorithm was of the "shooting'' type, in which the boundary conditions at each end of the bed were known, and iterations were done until the calculated flows matched the boundary conditions. When the pressure was held constant, the outlet flow of the bed and the composition changes in the bed were calculated for a given inlet flow. In Table 5.1, the Multiple-Cell model is compared to the semi-analytical results of Chapter 4. The results are for the two cases with differing lower pressures (PL = 1 arm and PL = 0.5 arm) and the same pressure ratio (IT = 15.6). The model was run with 150 cells, and the number of feed moles was chosen to be the same as that in the semi- analytical model. The Multiple-Cell model is in close agreement with the semi- analytical results. In Table 5.2, the results of running the Multiple-Cell Model with different numbers of cells are presented. The bed losses decrease as the number of cells decreases, but the second law efficiency remains almost constant. This would appear to imply that the presence of diffusion does not affect the efficiency of the cycle. 138PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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