1.

In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D‚ÇÅ and D‚ÇÇ are I.D. of inner and outer pipes)$?

A. (D₂² - D₁²)/D₁²
B. D‚ÇÇ - D‚ÇÅ
C. (D₂² - D₁²)/D₂²
D. None of these
Answer» B. D‚Äö√á√á - D‚Äö√á√Ö


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