PDF Publication Title:
Text from PDF Page: 086
Section 5.2 Initial considerations 5.2 Initial considerations 5.2.1 Design parameters In this work, the electrode area, the channel length and the channel width are subject to variation. The ratio of electrode height to width and the electrode thickness is not varied. The assignment of the denominations height, width and thickness is shown in Figure 5-1. The ratio of electrode width to height is selected to be 1.5. Small ratios are not useful because narrow and height electrodes introduce two main disadvantages. First, the hydraulic resistance of a flow-through electrode obviously increases linearly with its height. Secondly, the concentration of vanadium ions in the electrolyte is going to face large variations as it passes through such an electrode. The only advantage of a narrow electrode is a homogenous fluid flow distribution across the whole cross-sectional area. Large width-to-height ratios lower the pressure drop in the electrode and obtain a more homogenous SoC distribution within the electrode. However, very wide electrodes are challenging in terms of distributing the electrolyte flow homogeneously over the whole cross-sectional area. Although the high hydraulic resistance of the felt electrode intrinsically equalizes the electrolyte flow to a certain extent, additional measures to support the distribution are required for very wide electrodes. The design of special flow distribution structures within the cell is beyond the scope of this work. Consequently, the selected electrode width-to-height ratio is close to the lower limit of useful values. This allows for assuming a homogenous distribution of the electrolyte flow across the total cross-sectional area of the electrode. The second fixed parameter is the electrode thickness. In order to avoid a fourth variable design parameter, a constant electrode height of 4 mm is used in this work, which represents a moderate value. Table 5-1 Input cell design parameter Electrode area in cm2 Electrode width in mm Electrode height in mm Electrode thickness in mm Cell thickness in mm Manifold diameter in mm Manifold geometry factor in m-1 1000 2000 3000 4000 387 548 671 775 258 365 447 516 4 4 4 4 10 10 10 10 30 40 50 60 14.1 8.0 5.1 3.5 In the presented design study, electrode areas of 1,000 cm2, 2,000 cm2, 3,000 cm2 and 4,000 cm2 are studied. With the fixed ratio of electrode width to height, widths and heights shown in Table 5-1 are derived. The diameter of the internal manifold is increased along with the electrode area to account for the larger electrolyte demand. The overall cell thickness is 10 mm and results from two electrodes as well as membrane and bipolar plate. The resulting manifold geometry factor required for calculating the shunt currents is also given in Table 5-1. 78PDF Image | Model-based Design Vanadium Redox Flow Batteries
PDF Search Title:
Model-based Design Vanadium Redox Flow BatteriesOriginal File Name Searched:
10-5445IR1000070670.pdfDIY PDF Search: Google It | Yahoo | Bing
Salgenx Redox Flow Battery Technology: Salt water flow battery technology with low cost and great energy density that can be used for power storage and thermal storage. Let us de-risk your production using our license. Our aqueous flow battery is less cost than Tesla Megapack and available faster. Redox flow battery. No membrane needed like with Vanadium, or Bromine. Salgenx flow battery
CONTACT TEL: 608-238-6001 Email: greg@salgenx.com (Standard Web Page)