Standards for firewalls may be based on their
Chapter 5, Problem 5.93(choose chapter or problem)
Standards for firewalls may be based on their thermalresponse to a prescribed radiant heat flux. Consider a0.25-m-thick concrete wall (??2300 kg/m3,c?880 J/kg?K, k?1.4 W/m?K), which is at an initialtemperature of Ti?25C and irradiated at one surfaceby lamps that provide a uniform heat flux of. The absorptivity of the surface to theirradiation is ?s?1.0. If building code requirementsdictate that the temperatures of the irradiated and backsurfaces must not exceed 325C and 25C, respec-tively, after 30 min of heating, will the requirementsbe met?
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