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Thus, the maximum tolerable steady-state concentration of Cl in the evolved gas is (0.02ml)/ (89ml) or approximately 0.02%. This calculation admittedly assumed no CO^ is evolved on discharge and ignores debris formation. On the other hand it is conservative in that it is predicated upon an electrode consumption level of 10%, and data is available which demonstrates that as much as 50% (40 mils) could be lost and still allow adequate performance. Typical System Carbon Dioxide Levels The available data for various systems are admittedly quite variable. This is un doubtedly due to the incomplete control of various factors, and possibly to the age of a given unit. For example, the following charge levels have been documented: Vol. % co2 .01 .04 - .06 0.1 - 0.2 Electrolyte Temperature System [Cl~] 1.7kWh 8M 8.3kWh 8M 20kWh 8M 50 2 l£ pH mA/cin 40 0.2 -VS5 35 0.2 ^30 As the 1.7kWh system is the oldest, and as a result has well-aged electrodes, its CO2 rates can be considered more meaningful than that of the latter two units. Recently data from the 8.3kWh unit has shown that the discharge CO^ rate is 1/4 to 1/5 that found on charge. Using this ratio and the tabulated CO charge levels, 2^ this translates into approximately 0.0012g/cm of carbon lost in 1,000 hours of operation for the 1.7kWh battery unit. Activated PG-60 electrodes O.OSOin thick have an initial weight of approximately 2 0.22g/cm . Assuming 100% chlorine "efficiency", we can approximate as follows: Weight loss: Grams lost/cm : Hours @ 0.002g/1000 hrs: No. cycles (12 hr/cycle): 10% 25% 0.022 0.055 18,333 45,833 1,528 3,819 2 0.6 M2 28-5 1 O OPDF Image | Development of the Zinc-Chlorine Battery for Utility
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