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T , <|> , q , R. (percentage of heat load due to evaporation), T , Ke, out out av T*, ANu , A%COP and e (heat exchanger effectiveness of unwetted exchanger). CA WATER-AIR"^ <£w INTERFACE r . AIR ■ FREE CROSS ' SECTION TUBE CRITICAL CROSS-SECTION WATER FILM Figure 7. FLow Parameters of the Wetted Modules The water film is assumed to flow laminarly downward under the influence of gravity. The air passage between the fin is smaller due to the presence of water on both fin surfaces. The passage is smallest where the water flows around the tube. Obviously, the water flow must be selected such that the smallest cross- section is never blocked. This mixing temperature will be lowest when the entering air is saturated and at the wet bulb temperature TAWB- The precooled air will be heated within the exchanger, its temperature difference to the wall of the condenser will be larger everywhere than in the first case and the Log Mean Temperature Difference (LMTD) will be larger. The latter will be beneficial inasfar as the cooling capacity of the refrigeration system is increased and the compressor power decreased. Both will improve the coefficient of performance (see Figure 6). All these improvements resulted from cooling the air before it enters the condenser. The air moving through the heat exchanger is heated at constant moisture content and becomes unsaturated, therefore further improvement by adding more water is possible up to the point it approaches blocked air flow. Wetting the heat ex changer surface not only increases the heat transfer by mass transfer U -> U but w B-8PDF Image | Development of the Zinc-Chlorine Battery for Utility
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