Harmonic mean temperature difference is given by

1.	Harmonic mean temperature difference is given by
A.	(ΔT₁ . ΔT₂)
B.	.(ΔT₁ . ΔT₂)/(ΔT₁ + ΔT₂)
C.	.(ΔT₁ . ΔT₂)(ΔT₁ - ΔT₂)
D.	ΔT₁ - ΔT₂)/(ΔT₁ . ΔT₂)
Answer» C. .(ΔT₁ . ΔT₂)(ΔT₁ - ΔT₂)

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Harmonic mean temperature difference is given by

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