A 4-m-high and 6-m-long wall is constructed of two large 2-cm-thick steel plates (k = 15 W/m·K) separated by 1-cm-thick and 20-cm wide steel bars placed 99 cm apart. The remaining space between the steel plates is filled with fiberglass insulation (k = 0.035 W/m·K). If the temperature difference between the inner and the outer surfaces of the walls is 22°C, determine the rate of heat transfer through the wall. Can we ignore the steel bars between the plates in heat transfer analysis since they occupy only 1 percent of the heat transfer surface area?

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Steel plates Fiberglass -Insulation 99 cm 1 cm 20 cm 2 cm 2 cm