Log Mean Temperature Difference in Heat Transfer Formulas

The log mean temperature difference (LMTD) is a logarithmic average of the temperature difference between the hot and cold streams at each end of the heat exchanger. And is denoted by ΔT_m. Log Mean Temperature Difference is usually measured using the Kelvin for Temperature. Note that the value of Log Mean Temperature Difference is always positive.

Heat Transfer formulas that make use of Log Mean Temperature Difference

fxRate of Heat Transfer using Correction Factor and LMTDGo

fxHeat Transfer in Heat Exchanger given Overall Heat Transfer CoefficientGo

FAQ

What is the Log Mean Temperature Difference?

The log mean temperature difference (LMTD) is a logarithmic average of the temperature difference between the hot and cold streams at each end of the heat exchanger. Log Mean Temperature Difference is usually measured using the Kelvin for Temperature. Note that the value of Log Mean Temperature Difference is always positive.

Can the Log Mean Temperature Difference be negative?

No, the Log Mean Temperature Difference, measured in Temperature cannot be negative.

What unit is used to measure Log Mean Temperature Difference?

Log Mean Temperature Difference is usually measured using the Kelvin[K] for Temperature. Celsius[K], Fahrenheit[K], Rankine[K] are the few other units in which Log Mean Temperature Difference can be measured.

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