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fluxes. The factor ac /h. is the so-called "Lewis factor" and is PA equaltounityforLe=1. Thisisusuallythecaseintechnical problems involving moist air. Equation 16 can be written as ^bw +^+^ (17) indicating that the heat input to the control volume at the wet side heats the air by a dry and by a wet transport and heats the water. The heat flux to the air through the unwetted surface its diagram value) are given as ^d U&(Tc-TA) d (and c hA d c A U, (T - T.) (18) The diagram values of eqs. 17 and 18 are shown schematically in the i-x diagram of Fig. 7. The initial state of the air is A shown at the intersection of the vertical line through with the isotherm T^ in the unsaturated region. Due to heat and mass transfer the air of state A will change in enthalpyandmoisturecontent. Thisisexpressedbydi/dx. As shown in Fig. 7 this change points towards the so-called "pulling point." (B^representsanapparentstateofairwhichismixedwith air of state A.) For ac /h. 1, Bh 3 B. The air in the control pA volume of Fig. 6 is also heated at the unwetted surface A^ therefore its enthalpy change is altered and will be (di/dx) or towards the K pulling point BR. BR is at the same moisture content x^ as B^ but at a higher enthalpy The higher enthalpy is represented by the diagram value of the heat flux q^A^/A^. This state change (di/dx)R obviously is not very desirable in respect of cooling the air as much as possible by the evaporative process. The diagram of Fig. 7 does not specify the final state the air will reach and does not indicate changes of state of the pulling point(s) which result from the state change of the air-water interface. These changes of A and B's can be determined stepwise and by geometrical means as shown in [l]. For reasons of brevity we shall demonstrate the approach only briefly C-16PDF Image | Development of the Zinc-Chlorine Battery for Utility
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