In a double pipe concentric heat exchanger, the equivalent diameter of – McqOptions

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1.	In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D1 and D2 are I.D. of inner and outer pipes)
A.
B.	D2 - D1
C.
D.	none of these
Answer» B. D2 - D1

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