Temperature difference exists between outset and inside of a building and at difference units of a building. Heat is transferred from warm to cool place. The transfer of heat may take place by conduction, convection or radiation. Heat transfer mainly happens due to conduction through the solid building materials. This heat transfer depends on the conductivity of the intervening materials, temperature difference between two surfaces, the thickness of the material, the area of exposed material and the time through which the heat flow takes place.
Convection and radiation also play their role in the process of heat transfer through the building materials. Convection may take place through large areas and the thickness of the building material by currents of air transmit. Similarly, polished surfaces on the exposed side of a building may retard the inward flow heat and prevent heat penetration (Sharma, 1988).
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