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Section 7.2 Comparison of two sample designs for the three-stack string system Figure 7-4: Relative energy loss of designs 1.1 and 4.6 in a system using a three-stack string for a cycle with 25 mAcm-2 and 100 mAcm-2 (FF = Flow factor) 7.2.3 Efficiencies of the sample designs The Coulomb efficiency is the only efficiency which changes noteworthy for a three- stack string compared to a system using a single-stack, as shown in Figure 7-5. Due to its larger electrode area and thus its larger current carrying capability, the Coulomb efficiency of design 4.6 is significantly higher than the Coulomb efficiency of design 1.1. Naturally, this affects energy and system efficiency accordingly. Shunt currents significantly lower the efficiency of design 1.1 compared to design 4.6. The dependency of all efficiencies on the flow factor is the same as extensively laid out in Section 6.4.2 on page 91. 7.2.4 Discharge capacities of the sample designs Again, the discharge capacity shows a strong dependence on the applied flow factor and the applied current density. However, the general correlations are the same as laid out in Section 6.4.3 on page 93. For design 1.1, the discharge capacity for the lowest current density is strongly affected by shunt currents, as shown in Figure 7-6 a). Hence, for a reasonable flow factor, it is lower than the discharge capacity of the next larger studied current density, which is counter-intuitive. Besides the negative effect of shunt currents on the operation with a low current density, the discharge capacity is not affected by the electrical series connection of three stacks. 109 Relative energy loss in %PDF Image | Model-based Design Vanadium Redox Flow Batteries
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