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are smaller contributors to the losses. Again, the product availability (3.59%) and the exhaust availability (0.31%) are very small compared with the availability of the feed. Feed Work WF PSA Bed Inlet Stream 106,207 J/mol 02 (100%) Blowdown, WB 62,500J/mol 02 (58.89%) Purge, WPU 6808 J/mol 0 2 (6.41%) Pressurization, WPR 17,089 J/mol 0 2 (16.09%) Expanding Product, WR 6925 (6.52%) Product Availability, v|/p 3816 J/mol 0 2 (3.59%) Exhaust Availability, \|/E 333J/molOz (0.31%) Bed Loss 8696 J/mol 0 2 (8.19%) Figure 4.7 Grassman Diagram for the Ideal Four-Step Cycle. The bottom bar in Figure 4.7 is the true bed losses. These are the bed losses that are not associated with the energy loss during throttling, or with friction of any kind. These losses can truly be called the bed losses, as they occur entirely within the bed. In this example, they account for 8.19% of the feed availability. This is indeed a small fraction of the work input to the cycle, and indicates that the major source of energy loss 109PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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