A cylindrical liquid nitrogen tank of 25 cm inside diameter, 5 mm thickness and l m height having inside surface temperature of -196oC (same liquid nitrogen temperature). The tank is covered with 2.5 cm layer of insulation having k = 0.2 mW/m.oC. The outer surface temperature of insulation is 20oC and the ambient temperature is 25oC. The required energy to vaporize one kilogram mass of nitrogen at -196oC is 199 kJ. The thermal conductivity of the tank material is 0.025 W/m.oC. Calculate (1) The amount of nitrogen that vaporized per hour. (2) The temperature of the entire insulation surface. (3) Convection heat transfer coefficient

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