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Q5. With reference to multi-tubular heat exchangers, explain how EACH of the following contribute to satisfactory performance:

(a) tube wall thickness;(2)              (b) dense population of tubes in the tube plate;(2)

(c) tube materials selection;(2)       (d) coolant flow rates;(2)

(e) unimpeded passage of coolant at entry and exit from the tubes. (2)