Ein einfaches Modell zur Vorhersage der Fassaden- und Grenzschichttemperatur

A simplified model to predict the temperature of the boundary layer of façades.

The cooling energy demand of low-energy buildings with a high-quality building envelope is rather affected by solar and internal heat gains and the ventilation than by the heat transmission through the building envelope. Hence, the surface temperature of the façade has a small influence on the cooling energy demand. However, the higher air temperature in the boundary layer at the façade may increase the cooling load in buildings with window opening or façade integrated air-handling units. Neither monthly energy calculation programs nor building simulation programs use different temperatures for the ambient air to calculate the heat transfer through the façade and for the boundary layer to calculate the heat flux by ventilation. This article presents a methodology how to adapt the ambient air temperature to the temperature of the boundary layer.