Harmonic mean temperature difference is given by_________________?
(A) √(ΔT1 . ΔT2)
(B) 2 (ΔT1 . ΔT2)/(ΔT1 + ΔT2)
(C) 2 (ΔT1 . ΔT2)/(ΔT1 – ΔT2)
(D) (ΔT1 – ΔT2)/(ΔT1 . ΔT2)
Harmonic mean temperature difference is given by_________________?
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