換熱器 LMTD 方法

heatexchangerlmtd計算器

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

來源: engineeringtoolbox.com