Arithmetic and Logarithmic Mean Temperature Difference

Calculator for Arithmetic Mean Temperature Difference (AMTD) and Logarithmic Mean Temperature Difference (LMTD) in heat exchangers. Based on Newton's Law of Cooling, this tool computes mean temperature differences for parallel flow and counter-current flow configurations.

Arithmetic and Logarithmic Mean Temperature Difference

Calculate the Arithmetic Mean Temperature Difference (AMTD) and Logarithmic Mean Temperature Difference (LMTD) for heat exchangers.

AMTD Formula

AMTD = (tpi + tpo) / 2 - (tsi + tso) / 2

LMTD Formula

LMTD = (dti - dto) / ln(dti / dto)

Where:

dti = inlet temperature difference
dto = outlet temperature difference

Calculator

Inputs

Primary Inlet Temperature (°C)

Primary Outlet Temperature (°C)

Secondary Inlet Temperature (°C)

Secondary Outlet Temperature (°C)

Flow Type

Results

Arithmetic Mean Temperature Difference (AMTD)-- °C

Inlet Temperature Difference (dti)-- °C

Outlet Temperature Difference (dto)-- °C

Logarithmic Mean Temperature Difference (LMTD)-- °C