Performance assessment for solar shadings - State of the art

In the sixties of the last century solar calorimetric outdoor experiments have been performed on the combinations of solar shading devices and single and double glazed window units. From these experiments typical reduction factors for the effective total solar energy transmittance have been derived and published. In standards such as EN 832 [ 1] tables with typical reduction factors of the main shading device types are given. However, for a more exact derivation of the total solar energy transmittance of a façade including solar shading device, other means are needed. Within IEA Task 27 we try to develop and check methodologies to characterize solar shading devices experimentally, and compare with different theoretical calculations. The experimental characterisation is based on a new generation of solar calorimetric testing devices developed within completed European and national projects. In this paper We want to compare experimental results using these devices with calculated results using some new and unvalidated standards for different combinations of solar protection devices and glazings.