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04. A 1 m diameter spherical tank is buried in the earth at a place where k=1,1 W/mrc. The depth to the centerline is 50 cm, and the earth surface temperature is 5.C. The tank is used to store liquid chlorine that is maintained at (-35C). The latent heat of vaporization of chlorine is 293 kJ/kg . The tank is insulated with superinsulation material having a thermal conductivity of (0.001 W/mC). Estimate the amount of chlorine vaporized per day if the thickness of insulator is 20mm