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Standards for firewalls may be based on their thermal response to a prescribed radiant heat flux. Consider a 0.25-m-thick concrete wall (ρ=2300 kg/m3, c=880 J/kg·K, k= 1.4 W/m·K), which is at an initial temperature of Ti= 25°C and irradiated at one surface by lamps that provide a uniform heat flux of qs′′=1.05·104 W/m2. The absorptivity of the surface to the irradiation is αs=1.0. If building code requirements dictate that the temperatures of the irradiated and back surfaces must not exceed 325°C and 25°C, respectively, after 30 min of heating, will the requirements be met?
(a) The final temperature of the irradiated surface after 30 min is ?ºC.
(b) Will the code requirements be met?
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