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What are the examples of indirect heat exchangers?

(a) Shell and tube Heat exchanger, Plate heat exchangers

(b) Steam injectors, plate heat exchangers

(c) Cooling towers, Plate heat exchangers

(d) Steam injectors, cooling towers

I got this question in exam.

Query is from Heat Transfer Applications topic in section Heat Transfer Applications of Food Processing Unit Operations

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The correct choice is (a) Shell and tube Heat exchanger, Plate heat exchangers

Explanation: Indirect heat exchanger, the two fluids can transfer the heat where one fluid flows inside the tubes and other fluid flows over the tubes. Shell and tube Heat exchanger, Plate heat exchangers are the examples of indirect heat exchangers. Steam injectors, cooling towers are the examples of direct heat exchangers.

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