A composite wall is made up of external thickness of brick 110mm thick inside which is a layer of fiberglass 75mm thick, the fiberglass is faced internally by an insulating board 25mm thick, the coefficients of thermal conductivity of the three materials are, brick, 0.6w/mk, fiber, 0.04w/mk, insulating board, 0.06w/mk, the surface transfer coefficient of the inside wall is 2.5w/m^2k and that of the outside wall is 3.1w/m^2k, determine the overall heat transfer coefficient for the wal

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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.