Industrial furnace wall, steady state
Firebrick course
R
cond
=
0.06 K/W
q
=
3000 W
3 in series = 0.18 K/W
Ceramic fibre board
R
cond
=
0.18 K/W
Natural convection
R
conv
=
0.05 K/W
Radiation to shop
R
rad
=
0.075 K/W
Flame and hot gas
q″
r
=
18 W/cm²
Furnace interior
T
furn
=
1200 °C
Brick to board
T
bb
=
660 °C
Steel shell
T
shell
=
120 °C
Shop air
T
shop
=
30 °C