A composite wall is made up of an external thickness of brickwork 110mm thick inside which is a layer of fiberglass 75mm thick. The fiberglass is faced internally by an insulating board 25mm thick. The coefficient of thermal conductivity for the three are as follows: Brickwork 1.5 W/m-K Fiberglass 0.4 W/m-K Insulating Board 0.06 W/m-K The surface transfer coefficients of the inside wall is 3.1 W/m2-K while that of the outside wall is 2.5 W/m2-K. Take the internal ambient temperature as 10°C and the external temperature as 27°C. Determine the heat loss through such wall 6m high and 10m long. (kW)

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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.