The scope of the project is to develop a model for calculation of the g-value of a glazing system including Venetian blinds. This is done through present available literature and experiments.
Two main parameters are investigated. This includes the shading factor of the Venetian blinds and the exterior heat transfer coefficient on the outside of the glazing due to a change in airflow compared to glazings with no use of shading. Through experiments only the slat angle is varying while the theoretical models are varying dependent on both radiation angle and slat angle.
The velocity profile in the cavity is measured to study the type of air flow. The solar radiation through the window, both with and without shading, is measured for calculation of the shading factor of the Venetian blind.
The theoretical models are evaluated and compared with measurements done in a laboratory.