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The results indicate also the advantage of adding more rows of tubes to the evaporative condenser under good wetting conditions. (This statement resulted from computations not included in Table 1 or the Figures.) Evaporative condensers might still operate successfully even at hightemperatureswhereair-cooledcondensersareinoperative. (Am bient temperature » condensing temperature.) Table 2 lists data for T » T » Data for various <|> 's and different velocities are given -rUilD C A in Table 3. The evaporative condenser does not require close fin spacing (as was evaluated in other series of computations not included in Table l) thus large extended outside surfaces are not needed. This is of importance because fouling or deposition of impurities of the water or the air can possibly be avoided with larger spacing between the fins. Evaporative condenser performance decreases with increasing relativehumidityofambientair. Thisisduetothefactthatless latent heat transfer can occur within the exchanger. The overall improvement however is still high even under conditions of saturated air entering the exchanger. The increase of COP shown in Table I is very substantial for all casesshown. ForconditionsofT*=25°Candfixedcoolingload c savingofcompressorpowerof37$canbeachieved. Despitethein crease of pressure drop of the air flow in the wetted condenser an even higher overall improvement of 45$ results when the performance is defined as (COP) = Q /EP, where Q is the cooling load and EP see isthetotalpowerconsumptionofthesystem. Thisdearlydemon strates that evaporative condensers will help to conserve energy. The operating conditions of a wetted condenser assumed in this paperpossiblycannotberealizedinanactualdevice. Inaccordance also to [10,11,12] only a 10-12$ lower performance may result. In general it can be summarized that evaporative condensers can be used very beneficially whenever water supply is assured and when ever moisture content of exit air is of no concern or even desired. Continuously wetted heat transfer surfaces will minimize fouling and C-38PDF Image | Development of the Zinc-Chlorine Battery for Utility
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