**LMTD for Heat Transfer Calculation**

**Logarithmic Mean Temperature Difference**

- It is the mean temperature calculated to find the overall average heat transfer coefficients
- LMTD is a logarithmic average of the temperature difference (ΔTm) between the hot and cold feeds of the heat exchanger
- Understand the inlet and outlet of hot and cold fluid of the heat exchanger

**Calculation of LMTD for Heat Exchanger**

- Calculate the log mean temperature difference (ΔTm) for the following two possible arrangements
- Parallel or counter Flow
- Counter Flow

- $Calculate$ the
**Temperature differences ($ΔT_{1}$) based on the types of heat exchangers** - Calculate the Logarithmic mean temperature difference (LMTD)