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The furnace of a boiler is laid from fire clay brick with outside lagging from the plate steel, the distance between the two is quite small compared with the size of the furnace. The brick setting is at an average temperature of 365 K whilst the steel lagging is at 290 K. Calculate the radiant heat flux. Assume the following emissivity values
For brick = 0.85
For steel = 0.65
Options:
A .  352.9 W/m²
B .  452.9 W/m²
C .  552.9 W/m²
D .  652.9 W/m²
Answer: Option A
Answer: (a).352.9 W/m²

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