Consider a 800-W iron whose base plate is made of 0.5-cm-thick aluminum alloy 20218-T6 (p = 2770 kg/m3 , cp = 875 J/kg·K, α = 7.3 × 10-5 m2 /s). The base plate has a surface area of 0,03 m2 . Initially, the iron is in thermal equilibrium with the ambient air at 22°C. Taking the heat transfer coefficient at the surface of the base plate to be 12 W/m2 ·K and assuming 85 percent of the heat generated in the resistance wires is transferred to the plate, determine how long it will take for the plate temperature to reach 140°C. Is it realistic to assume the plate temperature to be uniform at all times?
FIGURE P18-21
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