A 4-m-high and 6-m-wide wall consists of a long 15-cm × 25-cm cross section of horizontal bricks (k = 0.72 W/m⋅K) separated by 3-cm-thick plaster layers (k = 0.22 W/m⋅K). 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⋅K) on the inner side of the wall. The indoor and the outdoor temperatures are 22°C and − 4°C, and the convection heat transfer coefficients on the inner and the outer sides are h₁ = 10 W/m²⋅K and h₂ = 20 W/ m²⋅K, respectively. Assuming one-dimensional heat transfer and disregarding radiation, determine the rate of heat transfer through the wall.

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Foam -Plaster Brick 15 cm- FIGURE P17-60 1.5 cm 25 cm 1.5 cm