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A 25 cm diameter black ball at 130°C is suspended in air and is losing heat to the surrounding air at 25°C by convection with a heat transfer coefficient of

A 25-cm-diameter black ball at 130°C is suspended in air, and is losing heat to the surrounding air at 25°C by convection with a heat transfer coefficient of 12 W/m2 ·K, and by radiation to the surrounding surfaces at 15°C. The total rate of heat transfer from the black ball is

(a) 217 W

(b) 247 W

(c) 251 W

(d) 465 W

(e) 2365 W

Jul 22 2020 View more View Less

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