A small oven consists of a cubical box of dimension L 0.1

Chapter , Problem 13.93

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A small oven consists of a cubical box of dimension L 0.1 m, as shown. The floor of the box consists of a heater that supplies P 400 W. The remaining walls lose heat to the surroundings outside the oven, which maintains their temperatures at T3 400 K. A spherical object of diameter D 30 mm is placed at the center of the oven. Sometime after the sphere is placed in the oven, its temperature is T1 420 K. All surfaces have emissivities of 0.4. L L (a) Find the following view factors: F12, F13, F21, F31, F23, F32, F33. (b) Determine the temperature of the floor and the net rate of heat transfer leaving the sphere due to radiation. Is the sphere under steady-state conditions?

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