Conference Paper

Proceedings of Building Simulation 2013: 13th Conference of IBPSA

Visual Comfort Under Real And Theoretical, Overcast And Clear Sky Conditions

Eliza SZCZEPANSKA – ROSIAK, Dariusz HEIM, Marcin GORKO

DOI: https://doi.org/10.26868/25222708.2013.1524
Abstract: The presented work is devoted to the analysis of visual comfort indexes under theoretical and real sky conditions: clear and overcast. For the selected period of the year, the sky luminance distribution was estimated using standard sky model and measurement data. Measurements were conducted through the whole year from March 2011 to March 2012. Illuminance distribution inside a room was estimated by way of computer simulation using Ray Tracing Techniques. Based on simulation results, Daylight Glare Index and Vertical Illuminance at Eye were determined at 1/3 and 2/3 depth of the room. The main goal of the presented study was to estimate the difference between theoretical and real daylight conditions and its effect on the value of comfort indexes. Both parameters (DGI and VIE) were estimated numerically and experimentally using scale model of the room. The second purpose of the presented analysis was to find the best possible solution for transparent façades considering different spectral properties of glazing systems. Four glazing systems differring in total visual transmittance were considered and analysed both numerically and experimentally. Taking into account the minimum level of illuminance at a working plane, the recommended solution was proposed. Finally, general remarks for highly glazed buildings were formulated with some recommendation depending on the façade's orientation.
Pages: 2765 - 2773
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