Daylight availability in top-lit atria: prediction of skylight transmittance and daylight factor

Calculating correlated color temperatures across the entire gamut of daylight and skylight chromaticities.

Natural outdoor illumination daily undergoes large changes in its correlated color temperature (CCT), yet existing equations for calculating CCT from chromaticity coordinates span only part of this range. To improve both the gamut and accuracy of these CCT calculations, we use chromaticities calculated from our measurements of nearly 7000 daylight and skylight spectra to test an equation that a...

The Owl in Daylight

Skylight Design Performance Evaluation Method Development with Thermal and Daylight Simulation

This paper presents a methodology for optimizing skylight design with the considerations of thermal comfort, daylight availability and energy performance by integrated daylight and thermal simulation. Dynamic thermal modelling programmed IES and daylight simulation engine Radiance are used as simulation tools to study energy performance of a shopping mall atrium with a skylight on the roof ...

Daylight Theory Manual

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Neural daylight control system

The paper describes the design, the implementation of a neural controller used in an automatic daylight control system. The automatic lighting control system (ALCS) attempt to maintain constant the illuminance at the desired level on working plane even if the daylight contribution is variable. Therefore, the daylight will represent the perturbation signal for the ALCS. The mathematical model of...