A spherical tank made up of stainless steel is to be used for storage of oil at 150°C that is needed for heating purposes in a plant. It is decided to insulate the tank in order to decrease the heat loss to the surroundings, which is at 20°C having heat transfer coefficient of 25 W/m2.K. The heat loss is compensated by the heating resistance inside of the tank. There are two types of insulating material present at this plant each is enough for covering the tank with only one layer. These are; Type 1: k=0.1 W/m.K thickness=5cm Type 2: k=0.25 W/m.K thickness=5cm An engineer is thinking about the most efficient way of covering the tank in order to minimize the heat loss. Please help him for this purpose. Is it more efficient to cover type 2 over type 1 or type 1 over type 2? Explain why?

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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.