Logarithmic Mean Temperature Differential Formula |
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| \( LMTD \;=\; \dfrac{ \Delta T_a - \Delta T_b }{ ln \cdot \dfrac{ \Delta T_a }{ \Delta T_b } }\) | ||
| Symbol | English | Metric |
| \( LMTD \) = logarithmic mean temperature differential | \(Btu \;/\; lbm\) | \(J \;/\; kg\) |
| \( ln \) = natural logarithm | \(dimensionless\) | \(dimensionless\) |
| \( \Delta T_a \) = temperature differential | \(F\) | \(K\) |
| \( \Delta T_b \) = temperature differential | \(F\) | \(K\) |
Logarithmic mean temperature differential, abbreviated as LMTD, also called log mean temperature differential, is used to determine the temperature driving force for heat transfer usually in heat exchangers.
