Question No. 17(a) A steel tube k=43.26 W/mK of 5.08 cm 10 and 7.62 cm 00 is covered with 2.54 cm of asbestos insulation k=0.208 W/Mk. The inside surface of the tube receives heat by convection from a hotgas at a -temperature of 316°C with heat transfer coefficient ha=284 W/m2K while the outer surface of Insulation is exposed to atmosphere air at 38°C with heat transfer coefficient of 17 W/m2 K Calculate heat loss to atmosphere for 3 m length of the tube and temperature drop across each layer. (b) Explain with neat sketch about pulverized fuel furnaces and its types.

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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.