MPPSC SES Mechanical

Practice session

A furnace wall consists of two layers: Firebrick (k_1 = 1.2 W/m-K, thickness L_1 = 0.2 m) and insulating brick (k_2 = 0.15 W/m-K, thickness L_2 = 0.1 m). If the inner surface temperature of the firebrick is 900°C and the outer surface of the insulation is 100°C, what is the rate of heat loss per square meter of the wall?

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