Excercise A cavity wall is made of thick brick
0.Im thick with an air Space 0.1m thick between
them.
1. Assuming the thermo conductivity of brick is
20 times that of air, cal. the thickness of the
brick which conducts the same quantity of heat
реr
Second
per unit area of 0.1m of air.
2. If the thermal conductivity of bricks is
0.5 w^-1 m¹k^-1, calculate
the rate of heat
Conducted
per unit area
through the cavity wall,when the outside surface of the
brice are respectively 19°C and 4°C .