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Problem

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question

The annular space between two concentricaluminium spheres is evacuated to provide insulation to the system. The radii of the inner and outer spheres are 0.75 ft and 1.0 ft, respectively. The inner sphere containsliquified oxygen and the outer sphere is maintained at 45°F. The boiling temperature of oxygen is - 297°F and the emissivity ofaluminiumis \epsilon = 0.03. Determine the rate of heat flow to the oxygen by radiation.

category

engineering

options

  1. 14.07 Btu/hr
  2. 22.15 Btu/hr
  3. 17.89 Btu/hr
  4. 12.48 Btu/hr
  5. 18.75 Btu/hr
  6. 15.26 Btu/hr
  7. 25.64 Btu/hr
  8. 20.32 Btu/hr
  9. 10.5 Btu/hr
  10. 19.83 Btu/hr

src

stemez-TransportPhenomena

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