Show that Equations 13.32 and 13.33 apply to an exchanger in which there are N parallel tubes

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Show that Equations 13.32 and 13.33 apply to an exchanger in which there are N parallel tubes of identical diameter if D is simply replaced by ND.

Equations 13.32Qs h DL = = -Q hT DL = A e(1-A) L/B L 1 L  [T,(x)  T,;(x)]dx = AT0 + (Tio  Tso) B (e(1-A)L/B - 1) - (1-A) L

Equations 13.33ht DL (TL - TL) - (  ) - 450 = In [(TL - TL)/(To  T)] - 10 =    In(/) = .m:

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