Liquid nitrogen is allowed to boil at temperature -182°C inside a tank. The tank is cylindrical in shape having hemispherical ends (1.5 m diameter and 7.5 m total length). The tank must be insulated...

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Extracted text: Liquid nitrogen is allowed to boil at temperature -182°C inside a tank. The tank is cylindrical in shape having hemispherical ends (1.5 m diameter and 7.5 m total length). The tank must be insulated to limit the rate of N, boil-off not to exceed 16 kg/hr. Calculate the thermal conductivity of the insulating material in W/m-K if its maximum thickness is limited to 70 mm. The latent heat of vaporization of liquid nitrogen is 200 kJ/kg and the temperature of the outside surface of insulation is equal to the room temperature of 22°C. Write your answer to four decimal places.