Wärmetauscher lmtd method

Log mean Temperatur difference (lmtd) method für Wärmetauscher Auslegung und analysis.

heatexchangerlmtdRechner

Overview

The Log Mean Temperature Difference (LMTD) method is used to calculate heat transfer in heat exchangers with a constant overall heat transfer coefficient.

Variables

Symbol	Description	Unit
$\Delta T_{lm}$	Log mean temperature difference	°C
$U$	Overall heat transfer coefficient	W/(m²·K)
$A$	Heat transfer area	m²
$Q$	Heat transfer rate	W

Formula

$\Delta T_{lm} = \frac{\Delta T_1 - \Delta T_2}{\ln(\Delta T_1 / \Delta T_2)}$

Calculator

Heat Exchanger LMTD Method Calculator

Hot fluid inlet(°C)

Hot fluid outlet(°C)

Cold fluid inlet(°C)

Cold fluid outlet(°C)

Overall U(W/(m²·K))

Heat transfer area(m²)

Notes

Results are approximate and should be verified for critical applications
Input values should be within reasonable engineering ranges

References

Original Source

Quelle: engineeringtoolbox.com