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on fabricating and testing a kW scale stack operated at 400 mA/cm2 and a high stack energy efficiency. FY16 Quarter 3 Project Status Summary A cost model was developed and validated in FY15 using a 20 cell stack operated between 160 and 320 mA/cm2 and a flow rate between 400 to 1200 cc/min/cell. The model allows cell or stack data as input to estimate system cost for various power to energy ratios. Data obtained under various conditions can be interpolated to obtain the optimum operating conditions for various power to energy ratios. A bottom-up approach was used to develop the model that would predict redox flow battery performance without any empirical fitting factors. The active reaction zone for each electrode was computed at each SOC and power, with the current density and flow rate being modified at each SOC to provide the required power while optimizing efficiency. Shown in Figure 11 is the predicted and experimental data for the 20 cell stack operated between 160 and 320 mA/cm2 with a flow rate between 400 to 1200 cc/min/cell. Data shown in Figure 11 was selected with higher current densities and flow rate which have lower system costs. a) 14PDF Image | High Current Density Redox Flow Batteries
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