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increases in addition the heat absorbing capacity of the air; i.e. its temperature change will be smaller and T T . m mw The following basic assumptions were made for the analysis of heat, and mass transfer of the evaporative cooling of the condenser [l], [2]. 1. 2. 3. 4. 5. 6. 7. The water is recirculated for use; The temperature of the water at the top of the unit is equal to that at the bottom of the unit; i.e., temperature of the water entering the coil is equal to its temperature at the exit of the coil; The water flow is many times the flow which should be sufficient ---for the- -complate evaporation.... There, must be.uniform_and ..effective distribution between fins and the deposit of impurities in water between the top and bottom of the coil should be negligible. Therefore, assumption to operate with an excess water quantity is a necessity. Otherwise, fouling and dust collection could be so severe that the condenser performance would deteriorate. Both complete wetting of the fins and incomplete wetting are in cluded in the analysis involving the coefficient of wetness K . w It is assumed that the wetting of the coil will be in the form of a water film flowing by gravity over the vertical fin. The water film should flow laminarly in order to be thin, of smooth surface, and steady. Calculations are based on the constant temperature of the refrigerant T^ in the condensation process. The values of the thermodynamical properties of the refrigerant R-12 are specified for the temperature of condensation T = 40°C. C In general, the state of air flowing through the wetted fins approaches gradually the saturation condition and the negative diagram value q^ approaches zero and becomes then increasingly positive and condensation might occur within the fins. The temperature of the water must for the same reason have a maximum somewhere along the spacer fin arrangement. This is shown in Figure 8. Figure 8 shows temperature distribution of water, air and refrigerant for T = 25°C, mPDF Image | Development of the Zinc-Chlorine Battery for Utility
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