A spherical thin walled metallic container is used to store liquid nitrogen at 72 K . The container has a diameter of 0.5 m and is covered with an evacuated, reflective insulation composed of silica powder. The insulation is 29 mm thick and its outer surface is exposed to ambient air at 301 K. The convection coefficient is known to be 24 W/m2 K. What is the rate of heat transfer to the liquid nitrogen (Enter the answer in W correct up to 3 decimal places)? Take the thermal conductivity k of evacuated silica powder is 0.0017 W/m K .

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.