Liquid oxygen which is boiling at 61 K is stored in a spherical container, 1 m in diameter covered with a 30 mm thick insulation having thermal conductivity of 0.0045 W/m°C. The outer surface is...

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Extracted text: Liquid oxygen which is boiling at 61 K is stored in a spherical container, 1 m in diameter covered with a 30 mm thick insulation having thermal conductivity of 0.0045 W/m°C. The outer surface is exposed to air at 326 K with a convective heat transfer coefficient of 22 W/m2°C. Latent heat of evaporation of oxygen is 214 kJ/kg. Find out the rate of O2 boil-off in kg/hr. Write your answer in four decimal places.