Standards for firewalls may be based on their thermal response to a prescribed radiant heat flux. consider a 0.25-m-thick concrete wall ( 2300 kg/m^3, 880 j/kg·k, 1.4 w/m·k), which is at an initial temperature of 25°c and irradiated at one surface by lamps that provide a uniform heat flux of 0.75·104 w/m^2. the absorptivity of the surface to the irradiation is 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?

yes requirement will be met

Explanation:

considering temperature distribution through following relation

where

Q = HEAT FLUX  = 0.75 \times 10^4 W/m^2

T(0,30 min) = 25 + 213.34 = 238.34 degree C

CALCULATE THE TEMPERATURE AT X = 0.25 M

T(0.25,30 min) = = 25.00 degree celcius

since both surface have temperature lower than allowable therefore code requirement be met

a

explanation:

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