On the influence of angular dependence properties of advanced glazing systems on the energy performance of buildings

Windows strongly influence the energy performances of buildings, especially in the new hugely glazed constructions. Many  advanced glazings were produced to improve the thermal and optical properties of windows, but for these products the angular dependence of optical and solar parameters are from the traditional glass decay curves. Computer tools often do not solve the problem of the inputting of effective solar and luminous parameters of transparent surfaces, since they consider only the traditional glazings behavior. The energy loads of an office building are calculated, by means of ad-hoc models and simulations with TRNSYS, to evaluate the errors that energy building simulation programs get into,  without  considering the effective properties of advanced glazing systems.