Question

The inner surface of a plane brick wall is at 60°C and the outer surface is at 35°C. Calculate the rate of heat transfer per m² of surface area of the wall, which is 220 mm thick. The thermal conductivity of the brick is 0.51 W/m°C.

Answer 1

Temperature of the inner surface of the wall t₁ = 60°C. 

Temperature of the outer surface of the wall, 

t₂ = 35°C 

The thickness of the wall, L = 220 mm = 0.22 m 

Thermal conductivity of the brick, 

k = 0.51 W/m°C 

Rate of heat transfer per m², q : 

Rate of heat transfer per unit area,