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A spherical liquid oxygen tank, 0.3 m in diameter is enclosed concentrically in a spherical container of 0.4 m diameter and the space in between

A spherical liquid oxygen tank, 0.3 m in diameter is enclosed concentrically

in a spherical container of 0.4 m diameter and the space in between is

evacuated. The tank surface is at 183C and has an emissivity of 0.2. The

container surface is at 25C and has an emissivity of 0.25. Determine the net

radiant heat transfer rate.

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