# Heat Transfer Coefficient of a Pipe Wall

Written by Jerry Ratzlaff on . Posted in Thermodynamics

The resistance to the flow of heat by the pipe wall material can be expressed by the heat transfer coefficient of the pipe wall.

### Heat Transfer Coefficient of a Pipe Wall FormulA

$$\large{ h_{wall} = \frac{ 2 \; k }{ d_i \; ln \; \left( \frac{ p_o }{ P_i } \right) } }$$

Where:

$$\large{ h_{wall} }$$ = heat transfer coefficient of a wall

$$\large{ ln }$$ = natural logarithm

$$\large{ p_i }$$ = pipe ID

$$\large{ p_o }$$ = pipe OD

$$\large{ k }$$ or $$\large{ \lambda }$$   (Greek symbol lambda) = thermal conductivity