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In how many practical classes can we divide shell and tube HE based on the number of tube passes?

In how many practical classes can we divide shell and tube HE based on the number of tube passes? Correct Answer 3

If we divide shell and tube HE based on the number of tube passes, we can divide it to 1-2, 2-4, and 3-6 shell and tube heat exchangers, i.e 3.

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