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Section 5.3 FEA simulations numbers 1, 2 and 3 denote designs with 1.5 meanders, whereas the numbers 4, 5, and 6 refer to designs with 2.5 meanders. The numbers 1, 2 and 3, as well as 4, 5 and 6, relate to an increasing geometry factor within the respective meander count. The comparison of cell designs that comprise electrode areas between 1,000 cm2 and 4,000 cm2 is challenging. As shown in Table 5-2, flow rate requirements almost vary by a factor of three. Hence, for smaller electrode areas, finer channel structures can be studied. While a larger pressure drop not necessarily results in a lower system efficiency, it certainly increases the requirements for the manufacturing process, regarding sealing and handling of arising forces in operation. Table 5-3: Geometry parameters and pressure drop at nominal flow rate of evaluated cell designs according to Table 5-2 on page 80 Design 1.1 1.2 Electrode area Meander Channel Channel length 481 mm 479 mm 476 mm 786 mm 783 mm 779 mm 697 mm 689 mm 686 mm 1140 mm 1129 mm 1124 mm 851 mm 845 mm 839 mm 1404 mm 1385 mm 1374 mm 974 mm 968 mm 960 mm 1592 mm 1582 mm 1565 mm Geometry factor 16,036 m-1 21,299 m-1 31,735 m-1 26,209 m-1 34,828 m-1 51,928 m-1 11,644 m-1 22,971 m-1 30,474 m-1 19,006 m-1 37,629 m-1 49,963 m-1 14,186 m-1 18,788 m-1 27,965 m-1 23,405 m-1 30,768 m-1 45,785 m-1 16,227 m-1 21,504 m-1 31,985 m-1 26,525 m-1 35,145 m-1 52,159 m-1 Nominal pressure 25.1 kPa 28.0 kPa 36.2 kPa 28.4 kPa 33.0 kPa 49.9 kPa 37.2 kPa 45.7 kPa 52.7 kPa 40.6 kPa 53.2 kPa 64.8 kPa 51.3 kPa 55.7 kPa 65.5 kPa 57.4 kPa 63.6 kPa 78.8 kPa 66.0 kPa 71.9 kPa 86.3 kPa 74.5 kPa 83.0 kPa 105.0 kPa 1.3 1000 cm2 1.4 1.5 1.6 2.1 2.2 2.3 2000 cm2 2.4 2.5 2.6 3.1 3.2 3.3 3000 cm2 3.4 3.5 3.6 4.1 4.2 4.3 4000 cm2 4.4 4.5 4.6 count 1.5 2.5 1.5 2.5 1.5 2.5 1.5 2.5 width 10 mm 7.5 mm 5mm 10 mm 7.5 mm 5mm 20 mm 10 mm 7.5 mm 20 mm 10 mm 7.5 mm 20 mm 15 mm 10 mm 20 mm 15 mm 10 mm 20 mm 15 mm 10 mm 20 mm 15 mm 10 mm 82PDF Image | Model-based Design Vanadium Redox Flow Batteries
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