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Design of shading systems is essential, since they plays an important role in the modulation ofdaylight and solar gains. Yet, current simulation tools are not capable of providing accurateresults for both daylighting and energy performance simultaneously, especially when complexgeometries are present. This work investigates whether shading coefficients (SC) can beapplied to evaluate the performance of thin screens, and it compares the results to thoseobtained through other methods, such as the use of a fixed transmittance value over the wholeyear. Results showed that hourly SC can take into account the variability of total transmittedsolar radiation throughout the year. As a result, the cooling energy reached reductions of up to22 % in comparison to the use of a fixed transmittance value. SC also enabled the assessmentof inter-reflections within the PS-glazing system, especially those resulted from varying thedistance between the PS and glazing.

USING RADIANCE TO ESTIMATE TRANSMITTED SOLAR RADIATION ENERGY FOR THIN PERFORATED SCREENS