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ANSWER THE TWO QUESTIONS

Define the overall heat transfer coefficient, in terms of the appropriate thermal resistances, for a two-fluid stream heat exchanger which has (a) a tubular and (b) plate-type construction. Consider fouling in both fluid streams.

Also, if fins or extended surfaces were included on both sides of each of the two types of heat exchangers, how would their effects be included in the requisite mathematical expressions for the thermal resistances and the overall heat transfer coefficient?

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