EngiRef / Thermodynamics Engineering Formula
Log Mean Temperature Difference
Log Mean Temperature Difference: Effective temperature difference for heat exchangers. A Heat Transfer formula in thermodynamics engineering.
Heat Transfer
Specification
- Name
- Log Mean Temperature Difference
- Discipline
- thermodynamics
- Category
- Heat Transfer
- LaTeX
- LMTD = \frac{\Delta T_1 - \Delta T_2}{\ln(\Delta T_1 / \Delta T_2)}
- Description
- Effective temperature difference for heat exchangers
- Conditions
- Counter-flow or parallel-flow heat exchanger
- Can solve for
- LMTD
- Tags
- lmtd, heat, exchanger, temperature, difference
Variables
| Symbol | Name | Unit | Si Unit | Imperial Unit |
|---|---|---|---|---|
| LMTD | Log Mean Temp Diff | K | K | °F |
| ΔT₁ | Temp Diff at End 1 | K | K | °F |
| ΔT₂ | Temp Diff at End 2 | K | K | °F |