Details

The steady-state heat flux for four walls in series was calculated from the total heat-transfer resistance. The flux is the same for each wall (since there is no heat generation), and thus the flux equation can be applied to each wall. The heat flux, conductivities, wall thicknesses, and the wall temperatures were used to determine the temperatures at the interfaces between walls.

,

,

,

where is the total thermal resistance (), is the wall thickness (cm), is thermal conductivity (W/[cm K]), is heat flux (), is temperature (°C), and is the thermal resistance for conduction ().

The screencast video at [1] works through a problem to calculate temperatures in a composite wall.

Reference

[1] Thermal Circuits: Temperatures in a Composite Wall [Video]. (Jan 6, 2012) www.youtube.com/watch?v=HZI65RuGa4M.