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when the cooling limit is reached, i.e., the entering air is satu rated and at wet hulh temperature The precooled air will he heated within the exchanger its temperature difference to the wall of the condenser will he larger everywhere than in the first case and the LMTD will he larger. U.AT A (2) GDI 1 ml c Cooling the air before it enters the heat exchanger might not change the heat transfer properties or other heat transfer parameters within theexchangerandU=U^. Equation(2)canthereforehewrittenas The LMTD AT^ > AT^ and Q, 'GDI U AT . A ml c Since only needs to he ex changed implies that , the size of the condenser could he made smaller, or U could he decreased hy lowering the velocity and pump ing power of the air, or AT^ could he made smaller hy means of loweringthecondensingtemperature. Thelatterwillhebeneficial inasfar as the cooling capacity of the refrigeration system is increasedandthecompressorpowerdecreased. Bothwillimprovethe coefficient of performance (see Fig. 2). Figure 2. T-S diagram, possible decrease of tempera ture of condensing refrigerant due to evaporative cooling. C-8PDF Image | Development of the Zinc-Chlorine Battery for Utility
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