1. A pipe of outside diameter 20 mm is to be insulated with asbestos which has a mean thermal conductivity of 0.1 W/m-deg. The local coefficient of convective heat to the surroundings is 5W/m2-deg. Comment upon the utility of asbestos as the insulating material. What should be the minimum value of thermal conductivity of insulating material to reduce heat transfer? ANSWER: 0.05 W/m-C

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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.