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Section 2.5 Shunt currents applied. A test material with a conductivity of σTest = 10 Sm-1 is assigned to funnel and channel of electrolyte inlet and outlet. The dimensions of the manifolds are taken into account, but the manifold itself is not part of the 3D-model. An excitation voltage of 0 V is applied to the faces which represent the beginning of the inlet channel and the end of the outlet channel. The described arrangement is shown in Figure 2-7. Figure 2-7: Excitation boundaries in the 3D-cell model for the calculation of the power loss The chosen ‘DC-Conduction’ solver of ANSYS Maxwell evaluates the total losses, PLoss, in the setup. The maximum permitted number of iterations is 100. A percentage error of 0.01 or smaller indicates the convergence of the solution. By applying Eq. (2-35), the power loss, which is the result of the FEA, is converted into the required ratio of channel length over channel cross-sectional area, which is the channel geometry factor. The channel geometry factor also comprises the funnel. However, the funnel has a negligible impact on the total geometry factor because of its short and wide dimensions. 2.5.6 Shunt current resistance of the manifold lCh σTestETest2 2000Wm-1 CSA2P P (2-35) Ch Loss Loss The manifold is considered as a short and wide cylinder filled with electrolyte. Hence, its geometry factor can be computed analytically, as shown in Eq. (2-36). In this work, a constant total cell thickness of 10 mm is assumed. The manifold diameter changes according to the cell design, as laid out in Section 5.2.1 on page 78. The deployed values are given in Table 5-1 on page 78. lM δC CSAM π dM2 2 (2-36) Wherein: δC Total cell thickness (m) dM Manifold diameter (m) 29PDF Image | Model-based Design Vanadium Redox Flow Batteries
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