A 100 mm diameter steam pipe is covered by two layers of lagging (insulation). The inside layer is 40 mm thick and has a thermal conductivity of 0.07 W/m K. The outside layer is 25 mm thick and has a thermal conductivity of 0.1 W/mK. The pipe carries steam at a temperature of 234°C , where the outside temperature of lagging is 24°C. If the steam pipe is 20 m long, determine (a) The heat lost per hour, (b) The interface temperature of lagging. Neglect the resistance of steam pipe as well as the convection resistances.

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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.