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Download Annual Dynamics of Daylight Variability and Contrast: A by Siobhan Rockcastle PDF

By Siobhan Rockcastle

Daylight is a dynamic resource of illumination in architectural area, growing various and ephemeral configurations of sunshine and shadow in the equipped surroundings. Perceptual features of sunlight, similar to distinction and temporal variability, are necessary to our realizing of either fabric and visible results in structure. even though spatial distinction and lightweight variability are primary to the visible adventure of structure, architects nonetheless count totally on instinct to judge their designs simply because there are few metrics that handle those elements. via an research of latest structure, this paintings develops a brand new typological language that categorizes architectural area when it comes to distinction and temporal edition. This study proposes a brand new family members of metrics that quantify the importance of contrast-based visible results and time-based version inside of daylit area by using time-segmented sunlight renderings to supply a extra holistic research of sunlight performance.

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Example text

The temporal map in Fig. 4 (high). 3 Annual Luminance Variability Annual luminance variability, which seeks to quantify the overall variation in brightness across an architectural space due to temporal fluctuations in daylight, is the third and final metric presented in this chapter. Whereas spatial contrast identifies compositional contrast boundaries within an image, and annual spatial contrast maps the accumulation of those contrast boundaries over time, luminance variability accounts for the accumulative differences in brightness between images.

Likewise, there is no need to minimize incoming light through an atrium space that is often meant to provide a transitional and variable experience for its occupants, who may spend the rest of their day in an artificially controlled office environment. In either case, there are definite correlations between programmatic use and the use of contrast in this gradient of contrast-driven daylight strategies. 3 The Typological Matrix The final matrix of contrast-driven architectural effects (Fig. 9) made it possible to distill each column down into a single representative space so that we might understand the gradient on a more explicit level.

Lighting Research and Technology, 32(3), 111–118. , & Spencer, D. (1942). Illumination for a nonuniform sky. Illuminating Engineering, 37(10), 707–726. , & Mardaljevic, J. (2006). The useful daylight illuminance paradigm: A replacement for daylight factors. Energy and Buildings, 38(7), 905–913. , & Compagnon, R. (2002). The luminance differences index: A new indicator of user preferences in daylit spaces. Lighting Research and Technology, 34(1), 53–68. , & Voss, C. (2003). Monitoring manual control of electric lighting and blinds.

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