jm-nr-sunbeam-final.pdf (2.64 MB)
Download fileThe sunlight beam index
journal contribution
posted on 2015-12-07, 15:05 authored by John MardaljevicJohn Mardaljevic, Nicolas RoyThis paper describes a fundamental rethinking of the basis for the evaluation of the sun-
light potential of spaces. It provides a robust methodology to answer the question: how
much sunlight can enter a room? The measure proposed is the cross-sectional area of
beam sunlight that passes through a window. The new measure { called the sunlight
beam index { is described, and examples are given for a realistic residential dwelling.
The sunlight beam index is determined for a full year on a time-step basis (e.g. every
15 minutes), but it can be aggregated into monthly or yearly totals. The annual total
provides a single measure for: one window; a group of windows; or, all the windows for
an entire dwelling.
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