Logarithmic mean temperature difference (LMTD) - Heat Transfer

Q.  How is the logarithmic mean temperature difference (LMTD) calculated for heat exchangers?Where,
ΔTi= temperature difference between hot and cold fluid at inlet of heat exchanger
ΔTe = temperature difference between hot and cold fluid at exit of heat exchanger
- Published on 12 Aug 15

a. ln (ΔTi– ΔTe)
b. ln (ΔTe – ΔTi)
c. (ΔTi– ΔTe) / ( ln (ΔTe / Δti))
d. (ΔTi– ΔTe) / ( ln (ΔTi / Δte))

ANSWER: (ΔTi– ΔTe) / ( ln (ΔTi / Δte))

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