PDF Publication Title:
Text from PDF Page: 099
Section 6.4 Comparison of two sample designs Loss distribution The losses accumulated during the previously simulated cycles can be related to ohmic losses, losses caused by vanadium crossover, losses due to concentration overpotential (COP), losses caused by shunt currents and pump energy demand. In Figure 6-3, the losses are referred to the discharging capacity to allow for a comparison of different designs, although the deployed electrolyte volume varies by a factor of four. Figure 6-3: Relative energy loss of the designs 1.1 and 4.6 for a cycle with 25 mAcm-2 and 100 mAcm-2 (FF = Flow factor, COP = concentration overpotential) For the operation at a low current density, the Coulomb losses, namely vanadium crossover and shunt currents account for the major loss share. The shunt current sensitive design 1.1 suffers significantly stronger from this parasitic process, compared to design 4.6. As expected, the latter shows a substantial reduction in shunt current losses. For nominal current density, the losses related to overpotentials dominate. While ohmic losses are identical for both designs for a given current density, concentration overpotential shows some variations. The flow factor for design 1.1 is significantly larger than for design 4.6. Hence, the concentration overpotential losses of design 1.1 are lower than for design 4.6. However, although the deployed flow factor for design 4.6 is smaller, the required pump energy is larger. The shunt current losses of design 4.6 are negligible for operation at nominal current density. 6.4.2 Efficiencies of the sample designs in dependence of the flow factor The designs 1.1 and 4.6 are studied in detail to illustrate the rating methodology of all designs. As shown in Figure 6-4 a) and b), the Coulomb efficiency hardly depends on the applied flow factor. The Coulomb efficiency increases with an increasing current density. 91PDF 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)