`LMTD = (DeltaT_A - DeltaT_B)/(ln(DeltaT_A) - ln(DeltaT_B))`

Enter a value for all fields

The Logarithmic Mean Temperature Difference calculator compute the logarithmic mean temperature difference based on the temperatures of the primary and secondary inlets and outlets of a system.

INSTRUCTIONS: Choose units and enter the following:

• (ΔT_A) Temperature Change at Point A
• (ΔT_B) Temperature Change at Point B

Logarithmic Mean Temperature Difference (LMTD): The calculator returns the mean in degrees Celsius.  However, however this can be automatically converted to compatible units via the pull-down menu.

The Math / Science

The formula for the Logarithmic Mean Temperature Difference is: 

`LMTD = (ΔT_A - ΔT_B)/(lnΔT_A - lnΔT_B)`

where:

• LMTD = Logarithmic Mean Temperature Difference
• ΔT_A = Temperature Change at Point A
• ΔT_B = Temperature Change at Point B

Heat Transfer Calculators

• Arithmetic Mean Temperature Difference (AMTD)
• Logarithmic Mean Temperature Difference (LMTD)
• Conductive Heat Transfer
• Thermal Diffusivity
• Heat Transfer Coefficient
• Heat Energy Transfer Rate
• Heat Transfer using LMTD
• Heat Exchange Area using LMTD