Question

A wall, 4x6 meters by 0.1m thick, experiences temperatures of 30°C on one side and 8°C on the other. The rate of heat transfer through the wall is 900 Watts. What is the thermal conductivity of the wall, and what is it probably made of?

Answer 1

`thermal conductivity k = 0,17045 (W )/(m * °C)`

It is probably made of wood

Step-by-step explanation:

The heat transmission for the wall is:

`Q =  (k * A * dT)/(e)`

Where k is the conductivity, A the area, dT the thermal gradient, and e the thickness.

Solving for k:

`k =  (Q * e)/(A * dT)`

replacing:

`A = 4m * 6m = 24 m2`

`e = 0,1 m`

`Q = 900 W`

`dT = 30 - 8 = 22 °C`

`k = 0,17045 (W )/(m * °C)`

The wood has conductivity values between 0,14 and 0,22 w/m°C