A typical section of a building wall is shown in Fig. P3-55. This section extends in and out of the page and is
FIGURE P3–55
repeated in the vertical direction. The wall support members are made of steel (k = 50 W/m·K). The support members are 8 cm (f23) X 0.5 cm (LB). The remainder of the inner wall space is filled with insulation (k = 0.03 W/m·K) and measures 8 cm (f23) × 60 cm (Lß). The inner wall is made of gypsum board (k = 0.5 W/m·K) that is 1 cm thick (f12) and the outer wall is made of brick (k = 1.0 W/m·K) that is 10 cm thick fe4). What is the average heat flux through this wall when Tx = 20°C and Ta = 35°C?
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