LMTD Calculator: Log Mean Temperature Difference

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All four temperature inputs use the same unit.
Counter flow is the most thermally efficient arrangement. Shell-and-tube configurations apply an analytical LMTD correction factor F.
Temperature of the hot fluid entering the heat exchanger.
°C
Temperature of the hot fluid leaving the heat exchanger.
°C
Temperature of the cold fluid entering the heat exchanger.
°C
Temperature of the cold fluid leaving the heat exchanger.
°C
Enable to compute heat duty Q and required transfer area A.
LMTDExcellent correction factor
60°C

Log mean temperature difference (effective driving force for heat transfer)

Corrected LMTD (F × LMTD)60°C
Correction factor F1
ΔT₁ (hot end)60°C
ΔT₂ (cold end)60°C
Temperature ratio R1
Temperature effectiveness P0.4
ΔT₁ (hot end)60
ΔT₂ (cold end)60
LMTD60
Corrected LMTD60

LMTD = 60.00 °C in counter flow configuration.

  • The effective driving force for heat transfer is 60.00 °C.
  • The heat capacity ratio R is 1.000 and the thermal effectiveness P is 0.400. A higher P means more heat is extracted relative to the maximum possible.

Next stepUse the corrected LMTD in Q = U × A × LMTD_corrected to size the heat exchanger, or check the heat duty panel above to compute Q and A directly.

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