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The heat transfer areas at the air-side of the heat exchanger are primary and extended areas and the temperature effectiveness no must be computed from the fin efficiency and from and the total fin of a module. The refrigerant flows inside tubes of hydraulic diameter IK, iAn and GR ‘ DhR ReR yR • 3600 where G„ is the equivalent mass flux of the refrigerant defined as [3]. K Pr-p 0*5 - [! + (~~) 1 (3it) PRS where the p's are the densities of saturated liquid and vapor respec tively at and v is the velocity of the refrigerant. 0K The Nusselt number of fluids condensing inside tubes is given by [3l; for Re < 50,000 area and for Re > 50,000 Nu^ = 0.0265 ReR*8 Pr^ 3 The inside heat transfer coefficient h^ is . “r di (36) = 5-03 ReR’3 Pr^3 (35) The overall heat transfer coefficient for the air-cooled module is obtained from aTTr. + mA FTR) (37) where the convective and conductive resistances are given as 1/n h.A (air-side convective 0Am Rf = TF/kFApc (fin resistance) C-22 resistance) = DI (33)PDF Image | Development of the Zinc-Chlorine Battery for Utility
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