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shows the work input (which is equal to the availability of the feed gas at PH) divided into three streams by the PSA system. The middle bar, which represents the availability of the product stream, is taken to be the availability of the pure oxygen product at the pressure PH. This availability includes the difference in pressure between the product stream and the ambient air (PH = 15.6 arm and Po = 1 arm, respectively), and the difference in composition between the product stream and the ambient air (yp = 0 and yo = 0.78, respectively). The equation for this is Equation (4.1). NP2 RT In PH^-yp) 0 (4.1) N P2 The bottom bar represents the availability of the exhaust stream, which Banerjee calculates to be 17,000 J/mol O2. The equation that I have used in the following section for the availabiHty of the exhaust stream per mole of product is Equation (4.2). Using this equation, I cannot arrive at the same value given by Banerjee; my calculation yields \|/B =333J/mol02. RTn +N In (4.2) ¥E=N EB 1-JV P2 yy0) The first term in Equation (4.2) is positive and the second is negative, as the exhaust stream is enriched in species A and depleted in species B. Even if both terms are taken as positive, the value of I|/E is 3733 J/mol O2 which is still much lower than the value given by Banerjee. However, my analysis, which follows, is not dependent on Banerjee's results. 102PDF Image | Energy Efficiency of Gas Separation Pressure Swing Adsorption
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