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For the stepwise integration of equation (19) (l-y) must be chosen small, otherwise, simultaneous displacement of B will occur and the assumption of = const, is violated. Usually y can be selected to be 0.5 and n' = £n2 = 0.693. For the total surface required nAA^ or n(0.693 a^) must be provided. The increase of water enthalpy is given by (23) Wb Sr and depends on the magnitude and sign of the diagram value q^ which which is given as Eqs. 2k and 25 yield r pa Mf=cpA i ^ 4i«, (25) In — (26) pw AlWb CPW ATb and B in the i-x diagram (see finite step Ax along the finite (24) %■ V "V Xh can be determined for each pair of A Fig. 7). Integrating Eq. 23 for the exchange surface AA^ yields %lny The integration procedure can be aided by Involving the quantity Ai mACPA 1 For fixed flow rates and selected y the product in the parentheses of eq. 26 is practically constant = b and Ai^ = bq^. The methods of determination of state changes of air and water due to heat and mass transfer processes discussed so far are sum marized and demonstrated in Fig. 9- For illustration of the state changes it is assumed in Fig. 9 that ac /h„ = 1 and A, = 0 (absence of dry surface). The water is pAd supplied with the flow rate m^ and at temperature T^. The flow rate of air is m^ and its state conditions are specified by T^, and i^. The refrigerant condenses at T^. Assuming that T^ = specifies the boundary state B (first pulling point). q^ can be determined from the last term of eq. 10 which yields on the ver tical line through x^, selecting y and applying eq. 19 yields x^ c-19PDF Image | Development of the Zinc-Chlorine Battery for Utility
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