Arithmetic Mean Temperature Difference

The Arithmetic Mean Temperature Difference calculator compute the 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:

• (P_in) Primary Inlet Temperature
• (P_out) Primary Outlet Temperature
• (S_in) Secondary Inlet Temperature
• (S_out) Secondary Outlet Temperature

Arithmetic Mean Temperature Difference (AMTD): 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 Arithmetic Mean Temperature Difference is: 

AMTD = (P_in + P_out)/2 - (S_in-S_out)/2

where:

• AMTD = Arithmetic Mean Temperature Difference
• P_in = Primary Inlet Temperature
• P_out = Primary Outlet Temperature
• S_in = Secondary Inlet Temperature
• S_out = Secondary Outlet Temperature

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