In a shell and tube heat exchanger having square pitch, the shell side equivalent diameter is given by (where, P = pitch, d = outside diameter of the tube) ?
Correct answer: A. 4(P2 - πd2/4)/πd
- A. 4(P2 - πd2/4)/πd
- B. (P2 - rd2/4)/rd
- C. 4P2/πd
- D. πd/4P2
Explanation
Equivalent diameter is four times the flow area divided by the wetted perimeter. For square pitch, the free area is P² minus πd²/4 and the wetted perimeter is πd, giving option A.
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