Two-phase gas–liquid oxygen is stored in a spherical tank of 1-m diameter, where it is mai...

Two-phase gas–liquid oxygen is stored in a spherical tank of 1-m diameter, where it is maintained at its normal boiling point. The spherical tank is enclosed by a 1.6-m diameter concentric spherical surface at 273 K. Both spherical surfaces have an emissivity of 0.01, and the gap between the inner sphere and outer sphere is vacuumed. Assuming that the spherical tank surface has the same temperature as the oxygen, determined the heat transfer rate at the spherical tank surface. Answer: 241 K