2-139 A 3-m2 hot black surface at 80°C is losing heat to the surrounding air at 25°C by convection with a convection heat transfer coefficient of 12 W/m2 · °C, and by radiation to the surrounding surfaces at 15°C. The total rate of heat loss from the surface is a) 1987 W b) 2239 W c) 2348 W d) 3451 W e) 3811 W | |
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