Harmonic mean temperature difference is given by
A)?(?T1 . ?T2)
B)2 (?T1 . ?T2)/(?T1 + ?T2)
C)2 (?T1 . ?T2)/(?T1 - ?T2)
D)(?T1 - ?T2)/(?T1 . ?T2)

Question

Quizplus · Accepted Answer

The harmonic mean temperature difference (HMTD) is used in heat exchanger calculations and is given by the formula 2(ΔT1 . ΔT2) / (ΔT1 + ΔT2), where ΔT1 and ΔT2 are the temperature differences at each end of the heat exchanger.

Harmonic Mean Temperature Difference Is Given by