Abstract
Current numerical models of façade’s cladding do not account for ventilated air cavity heat resistance. The major problem in assigning its properties is the complexity of the air thermal conductivity coefficient calculation inside a ventilated air cavity. National standards and building codes provide design methods for calculating thermal resistance values for non-ventilated air layers depending on their thickness and location in the structure. The procedure of ventilated air cavity thermal design is not correct when its thermal conductivity coefficient is used as for a non-ventilated interlayer. In order to overcome the lack in the adequate design method, an approach utilizing both the finite element and analytical solutions of the heat exchange equation has been proposed in the present paper. In doing so, the formula derived for calculating the equivalent value of the air thermal conductivity in a ventilated air layer takes into account the heat exchange by radiation as a design value.
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