Optical and thermal design and modelling of architectural shading systems

The use of shading elements in building façades is a common resource when an energy efficient building is designed, moreover in warm climates. Nevertheless, commonly used building thermal modelling tools, only allow a simplified definition of the shading element geometry. In order to design better performing shading elements, an accurate characterization of the geometry and the optical and thermal performance of the elements should be carried out and their effects on the energy efficiency of the building simulated.
This study describes the thermal and optical characterization and modelling of a 3D shaped metallic façade shading element and the resulting new Type for TRNSYS. This Type enables the simulation of the energy performance of the shading element when placed in building façades. Energy performance simulations for office buildings, for different façade orientations and in several climatic zones in Europe have been carried out. The results are compared and the most appropriate and performing applications of these elements are assessed.