The wall of a furnace is made up of a material which has thermal conductivity of 3.5 W/m◦C and a thicknesses 400 mm. The inner side of the furnace wall is exposed to hot gases at 1000 ⁰C with a convection coefficient of 40 W/m2⁰C and the inside the surface of the wall is at 600 ⁰C. The air outside the furnace is at 18 ⁰C with a convection coefficient of 15 W/m2⁰C. Draw a clear diagram representing the system                                Determine the temperature of the outside surface of the furnace The rate of heat loss from the furnace.

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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.