The goal of this study was to provide building designers with daylight performance data on four-sided atria with various well and canopy configurations under an overcast sky. A total of seven different atrium well configurations and a total of 36 atrium canopy configurations were parametrically evaluated with physical scale models in terms of their impacts on the illuminance levels on the atrium floor. Effective transmittance data of the 36 canopy systems were determined from the measured daylight factors so that the effective transmittance data could be used when determining daylight factors inside atria with various alternative canopy systems.
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3.
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