The logarithmic mean temperature difference (tm) is given by (where Δ – McqOptions

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1.	The logarithmic mean temperature difference (tm) is given by (where Δt1 and Δt2 are temperature differences between the hot and cold fluids at entrance and exit)
A.	tm = (Δt1 - Δt2)/ loge (Δt1/Δt2)
B.	tm = loge (Δt1/Δt2)/ (Δt1 - Δt2)
C.	tm = (Δt1 - Δt1) loge(Δt1/Δt1)
D.	tm = loge (Δt1 - Δt2)/ Δt1/Δt2
Answer» B. tm = loge (Δt1/Δt2)/ (Δt1 - Δt2)

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