Question

A plane wall of 1000mm thickness and area 3m has steady surface temperature of 170°c and 100°c. Determine the rate of heat flow across the plane wall.

Answer 1

The thermal conductivity of duralumin used in plane walls is 160 W/(m·K).

Find the rate of heat flow across the plane wall:

$$q=\frac Qt=-kA\frac{\Delta T}{\Delta x}=--33600\text{ J/s}.$$