Consider a furnace wall afetde of sheet metal at an average temperature of 800°C exposed to air at 40°C. The combined heat transfer coefficient is 200 W/m2·K inside the furnace, and 80 W/m2·K outside. If the thermal resistance of the furnace wall is negligible, the rate of heat loss from the furnace per unit surface area is
(a) 48.0 kW/m2
(b) 213 kW/m2
(c) 91.2 kW/m2
(d) 151 kW/m2
(e) 43.4 kW/m2
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