This paper presents algorithms for calculation of sky components and daylight factors in linear building structures using the solid angle projection method. In order to estimate the precision of calculations two sky models; the uniform sky and CIE overcast sky, both giving equal illuminance on the horizontal plane, are used. Daylight factors calculated for CIE overcast sky are also compared to daylight factors measured in a physical scale model of a linear atrium in an artificial sky of the mirror-box type.
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