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Multiscale daylight modeling for urban environments

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posted on 2016-11-14, 12:36 authored by John MardaljevicJohn Mardaljevic, George M. Janes
Daylight in buildings is the natural illumination experienced by the occupants of any man- made construction with openings to the outside. The quantity and quality of daylight in buildings is continually varying due to the natural changes in sun and sky conditions from one moment to the next. In urban settings, the dynamics of daylight illumination are ampli ed by the vertical extent of buildings and the density of the built form. Traditional schema for evaluating daylight in the built environment consider only one or perhaps a few `snapshot' conditions, e.g. a single overcast sky, or a sequence of shadow patterns for selected hours. This chapter describes the application of a technique called climate-based daylight modelling (CBDM) across various urban scales { from o ce spaces to large- scale city models. Climate-based daylight modelling is the prediction of various radiant or luminous quantities (e.g. irradiance, illuminance, radiance and luminance) using sun and sky conditions that are derived from standard meteorological datasets. Climate- based modelling delivers predictions of absolute quantities (e.g. illuminance) that are dependent both on the locale (i.e. geographically-speci c climate data is used) and the building orientation (i.e. the illumination e ect of the sun and non-overcast sky conditions are included), in addition to the building's composition and con guration. The examples described in this chapter include theoretical studies and two `live' projects.



  • Architecture, Building and Civil Engineering

Published in

Solar Energy at Urban Scale


159 - 190


MARDALJEVIC, J. and JANES, G., 2012. Multiscale daylight modeling for urban environments. IN: Beckers, B. (ed.). Solar Energy at Urban Scale. London: ISTE and John Wiley & Sons, pp.159-190.


ISTE and John Wiley & Sons (© ISTE)


  • AM (Accepted Manuscript)

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This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

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