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17-56 A 4-m-high and 6-m-wide wall consists of a long 18-cm 30-cm cross section of horizontal bricks (k=0.72W/mK) separated by 3-cm-thick plaster layers (k=0.22W/mK). There are also 2cm-thick plaster layers on each side of the wall, and a 2 -cm-thick rigid foam (k=0.026W/mK) on the inner side of the wall. The indoor and the outdoor temperatures are 22C and 4C, and the convection heat transfer coefficients on the inner and the outer sides are h1=10W/m2K and h2=20W/m2K, respectively. Assuming one-dimensional heat transfer and disregarding radiation, determine the rate of heat transfer through the wall. 17-56 456W (isotherm)