Development of the Zinc-Chlorine Battery for Utility

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Development of the Zinc-Chlorine Battery for Utility ( development-zinc-chlorine-battery-utility )

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From the convective resistance can he computed and the overall heat transfer coefficient Uw (refrigerant-water) can he evaluated. The heat transfer from the water surface to the air can he treated in the same way as shown for the dry channel hy correcting the hydraulic diameter to account for the smaller cross-section for the air flow. The heat transfer coefficient h^ evaluated above will yield the mass transfer coefficient 0 when the Lewis factor is specified. The state changes of the air and water flows can therefore he determined hy stepwise integration graphically with the aid of the i-x diagram aswasdemonstratedabove. Thegraphicalapproachcanhesimulated analytically when the thermodynamic parameteters of the moist air, such as the partial saturation pressure p of water vapor, humidity ratio x and i can he given hy mathematical relationships. For thecomputersimulationonlyT=f(p )orp^=f(T)needstohe established; all the others can then he determined from well-known equations. For the temperature range of interest (10 to ^2 C) a mathematical curve fit to tabulated data [9] yielded TA=-73.00+17.03Inpgh , or Pgb = exp (0.0587 TA + U.2866) (^7) The coefficient of determination was r = 0.998768 therefore the equations represent the data excellently. Introducing eq. (^7) into 0.622 100P - ._sk. gb -gh -gh (48) 0.622 yield humidity ratio x^ for unsaturated or x^ for saturated conditions. P is the total pressure of the moist air (= 760 mm Hg) and ^ is the relative humidity of the air in percent. C-25

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