How many times do we calculate effective diameter/hydraulic diameter for a double pipe heat exchanger?

How many times do we calculate effective diameter/hydraulic diameter f

1.	How many times do we calculate effective diameter/hydraulic diameter for a double pipe heat exchanger?
A.	1
B.	2
C.	3
D.	4
Answer» B. 2

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How many times do we calculate effective diameter/hydraulic diameter for a double pipe heat exchanger?

How many times do we calculate effective diameter/hydraulic diameter for a double pipe heat exchanger?

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