Modeling of ventilated façades for energy building simulation software

•The experimental validation in the several weather conditions and colours of the external board.•All physical properties of the materials employed have been measured, not inferred.•A new correlation that takes into account the wind direction has been contributed, and validated.

This article presents a complete mathematical model which improves the description of the thermal response of a ventilated façade. The model has been validated experimentally for a wide variety of weather conditions; hot and cold days, cloudy and sunny and with clear or dark coloured external board with very good matching. In the validation process the improvement to achieve the matching between the model and the experiences takes into account the influence of the wind direction on the velocity of the air inside the ventilated space.