Conventional daylighting calculation techniques are not suitable for predicting due to the complex inter-reflection phenomenon occurring inside the atrium light well, the sheer size and specific characteristics of the atrium space. In this paper a computer modelling technique using the flux-transfer method is presented focusing on the linear, open-end atrium. A systematic evaluation of the daylighting efficiency is where the effect of some dominant design attributes is examined. Daylighting Efficiency Factors (DEF) are generated for typical atrium sizes. The effects of the geometric proportions of the atrium and the atrium wall reflectance are embedded within these factors.
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