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5) I z g < oc 1 atm 0.66 atm TEMPERATURE — °C Relationship between dissolved chlorine gas I- z UJ Ozo 0 UJ 1 oc 0 _J o1 Figure 24-9. and temperature and pressure of system. Test run with 3M ZnCl2 electrolyte. Another plot of the data at a constant 30°C temperature is shown in Figure 24-10. This clearly indicates the linear relationship between chlorine gas pressure and chlorine solubility in agreement with Henry's Law. Henry's Law can be stated as pC]_2 = ■*cXCl2 ’ wkere PCI2 = Partial pressure of chlorine gas in the atmosphere, and Xci2 = the concentration of dissolved chlorine gas in grams per liter. Definition of the constant is: k for chlorine = 0.39 liter-atmospheres per gram of dissolved gas. The test cycles run during this Phase I program were made at reduced pressure with the intent of keeping coulombic efficiencies high. It is difficult to find evidence in the experimental data gathered to date (Table 24-1), that the coulombic efficiency is significantly influenced by the chlorine pressure. More cycles with a broader range of temperature and pressure settings will be required to see this effect. Work on this study will continue into the Phase II program. Another temperature effect, which was observed during the submodule tests, may be of significance. Temperature appears to affect the rate at which molecular hydrogen is liberated from the battery stack. Hydrogen generation was noted to be signifi cantly more during runs at 45/50°C than it was when the electrolyte was held at or below a temperature of 40°C. 24-14PDF Image | Development of the Zinc-Chlorine Battery for Utility
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