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Section 6.5 Evaluation of all twenty-four cell designs density. The minimally required flow factor only depends on the electrode area, not on the channel design. 6.5.4 Auxiliary losses The pump power demand is the only considered source of external or auxiliary losses in this work. Its influence on the RTSE is evaluated by studying the auxiliary efficiency, ηAux. From Eq. (3-4) on page 59 we derive Eq. (6-8). ηAux ηSys ηEne (6-8) In general, the auxiliary efficiency is higher for a short and wide channel than for a long and narrow channel, as shown in Table 6-4. This is reasonable, as the latter introduces an additional hydraulic resistance and thus an additional pump power demand. However, what is more interesting is the fact that the auxiliary efficiency also decreases gradually for larger electrode areas. Table 6-4: Auxiliary efficiency due to pump power demand of all twenty-four designs for a cycle with nominal current density and flow factors according to Table 6-3. Channel design variation 1 2 3 4 5 6 short short short long long long wide medium narrow wide medium narrow Area Electrode variation area 1 1000 cm2 2 2000 cm2 3 3000 cm2 4 4000 cm2 98.3% 98.2% 97.8% 98.2% 97.9% 97.2% 98.1% 97.7% 97.4% 97.9% 97.4% 96.9% 97.8% 97.7% 97.3% 97.6% 97.4% 96.8% 97.5% 97.3% 96.9% 97.2% 96.9% 96.2% Figure 6-9: Electric pump power of all twenty-four designs referred to their nominal current for nominal flow rates according to Table 5-2 on page 80 to overcome the channel hydraulic resistance 99 Specific electric pump power in WA-1PDF Image | Model-based Design Vanadium Redox Flow Batteries
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