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Pertinent information of the geometry of one module is given in Fig. 5. J ) ----- j----- i i ST Figure 5. Module of the Plate Heat Exchanger Coil The following basic assumptions were made for the analysis of heat, and mass transfer of the evaporative cooling of the condenser. 1. Thewaterisrecirculatedforuse. 2. Thecirculatingpathsarethermallyinsulated. 3. Thetemperatureofthewateratthetopoftheunitisequal 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. k. Therefrigerant(R-12)isneverheatedinthecourseofits flow, due to the fact that the condensation process is re quired only. 9 5. Thewaterflowm^ismanytimestheflowwhichshouldbe sufficient for the complete evaporation, due to the require ment of its uniform and effective distribution between fins and the request that the concentration of impurities in water between the top and bottom of the coil should be negligible. Therefore,assumptiontooperatewithanexcess waterquantityisanecessity. Otherwisefoulinganddust collection could be so severe that the condenser becomes inoperative.6 7 6. Both complete wetting of the fins and incomplete wetting are included in the analysis involving the coefficient of wet ness K . w 7. Itisassumedthatthewettingofthecoilwillbeinthe form of a water film flowing by gravity over the vertical fin. C-12PDF Image | Development of the Zinc-Chlorine Battery for Utility
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