An insulated steam pipe located where the ambient temperature is 32°C, has an inside diameter of 50mm with 10mm thick wall. The outside diameter of corrugated asbestos insulation is 125mm and the surface coefficient of still air, ho = 12 W/m2-K. Inside the pipe is steam having a temperature of 150°C with film coefficient of 6000 W/m2-K. Thermal conductivity of pipe and asbestos insulation are 45 and 0.12 W/m-K respectively. Determine the heat loss per unit length of pipe.

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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.