A 4-m high and 6-m wide wall consists of a long 18-cm x 30-cm cross section of horizontal bricks (k = 0.72 W/m ·°C) separated by 3-cm-thick plaster layers (k = 0.22 W/m ·°C). There are also 2-cm-thick plaster layers on each side of the wall, and a 2-cm-thick rigid foam (k = 0.026 W/m ·°C) on the inner side of the wall. The indoor and outdoor temperatures are 22 °C and -4 °C, and the convection heat transfer coefficients on the inner and outer sides are 10 W/m2 ·°C and 20 W/m2 ·°C, respectively. Assuming one-dimensional heat transfer and disregarding radiation, determine the rate of heat transfer through the wall.