Harmonic mean temperature difference is given by

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📊 Heat Transfer

Q. 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)

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✅ Correct Answer: (B) 2 (ΔT1 . ΔT2)/(ΔT1 + ΔT2)

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