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Table II-2 – Symbols, names, descriptions, values, and sources for model parameters. Values with asterisks (*) are baselines for each variable but are subsequently varied in sensitivity analyses. Note: the SI mentioned refers to that of the published version of this chapter [60]. Symbol Name Description Labor cost to service system (via additives) - Interest rate on loan payments Fraction of capital costs financed by debt Net energy efficiency of the entire system Scaling factor of the charge cost, representing the # of electrons that must be transferred per vanadium ion to fully charge the battery -- Projected inflation on market rate Combined USA federal and state tax rate on investment expenditures Years of simulated operation or lifetime Linear overall capacity fade rate Linear capacity fade rate that is due to drift in average electrolyte oxidation state and is not recovered upon electrolyte rebalancing (a fraction of Rfade) -- -- -- By weight -- Value and Source 10 $ kWh-1 per visit [6] • 0.12 (annually) [59] • (1.12)1/365-1 (daily) 8% [59] 20% [59] 85% [61] • 1 under normal circumstances • Between 1 and 1.5 during partial rebalancing (see SI – S2) 10.98 ¢ kWh-1 [62] • 0.01 (yearly) [63] • (1.01)1/365-1 (daily) 39% [59] 20 years [59] * 0.44% capacity fade per cycle [44] * 0.055% (see SI – S3) 1.4 V [61] 96,485.33 C per mol e- 90.03 g mol-1 0.996 [64] 1.10 $ kg-1 [65] O ry / rd dr fd εE CF pe ri T n Rfade rED U F MWox wox Cox Operational cost rate Discount rate Debt interest rate Debt finance ratio Roundtrip system cycle energy efficiency Charging factor Electricity price Electricity inflation rate Combined tax rate Operational period Fade rate Electrolyte decay rate Open circuit voltage Faraday’s constant Molecular weight of oxalic acid Oxalic acid purity Cost of oxalic acid 22PDF Image | Bringing Redox Flow Batteries to the Grid
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