Optimizing the configuration of a façade module for office buildings by means of integrated thermal and lighting simulations in a total energy perspective

► Integrated thermal-daylighting simulations on a low energy building are performed. ► Optimal WWR of the façade that minimizes the total energy demand is searched. ► Optimal WWR are found in the range 35-45%, regardless the orientation, in a temperate oceanic climate. ► If state-of-the-art technologies are used, WWR does not play a crucial role (maximum influence: 11%). ► The optimal configurations are tested against different building geometries and HVAC efficiencies.