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Figure 8-39 Stacks in Series Approach Reversibility A graph of Nernst potential versus fuel utilization for the given feed stream compositions (60) was duplicated three times in Figure 8-39. The Nernst potential is the voltage which drives reversible electrode reactions. This reversible voltage, generated by the overall cell reaction, is a function of the local temperature, pressure, and reactant concentrations. As reactants are utilized, their concentrations change. Since Nernst potential is dependent upon the concentrations of reactants, it varies with the degree of utilization. Fuel utilization is directly proportional to the charge transferred across the electrolyte. Therefore, the shaded areas of the graphs represent power -- the product of voltage and current. If reversibility is assumed at the outlet of each stack, no voltage losses are deducted from the Nernst potential. Therefore, each shaded area represents the maximum power, which each cell could generate. System A in Figure 8-39 is composed of a single stack. Three stacks are arranged in series in system B. System C features many, or "n," stacks configured in series. In all three systems, the voltage of each stack corresponds to reactant concentrations at its outlet. For comparison, each system is assumed to have the same total stack membrane area. That is, the area of each stack in system B is one third the area of the stack in system A. Similarly, the 8-84PDF Image | Fuel Cell Handbook (Seventh Edition)
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