Standardization of luminance distribution on clear skies
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Standardization of luminance distribution on clear skies

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Published by CIE in Paris .
Written in English


Book details:

Edition Notes

Text in English, French and German.

Statementpreparedby an International Commission on Illumination , Technical Committee.
SeriesPublication CIE 22 (TC-4.2) 1973
The Physical Object
Pagination30p. :
Number of Pages30
ID Numbers
Open LibraryOL17052801M

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  The aim of this research work is to propose sky radiance and luminance distribution models for all sky conditions from clear sky to overcast sky. The classification method of sky conditions is examined. Clear sky index is defined based on the global irradiance. Cloudless index is defined based on the global irradiance and the diffuse by: An absolute standard sky luminance distribution model called the “All Sky Model” is introduced that is the multiplication of the Relative All Sky Model and the All Sky Zenith : Richard Kittler.   It defines the luminance distribution of the sky into several sky types; cloudy sky, partly cloudy sky to clear sky. Since the introduction of the first sky model by Moon and Spencer in [1], such models were used in buildings design and computer graphics and by: 4. Peak luminance of a typical LCD monitor: cd/m 2: Typical photographic scene on overcast day: 10 3: kcd/m 2: 2 kcd/m 2: Average cloudy sky: kcd/m 2: Moon surface: 5 kcd/m 2: Typical photographic scene in full sunlight: 7 kcd/m 2: Average clear sky: 10 4: 10 kcd/m 2: White illuminated cloud: 12 kcd/m 2: Fluorescent lamp: 75 kcd/m 2.

Any applicable standard sky, however, has never found that shows accurately the actual state of daylight. A research work was carried out by the authors in order to establish a suitable sky model that can represent all the sky luminance distribution from the clear sky to the overcast sky continuously. An excellent standard of the sky luminance distribution is necessary for daylighting design. CIE Standard Clear Sky and Overcast Sky (A, ) show the two extreme sky conditions. Most of the real skies lie between the two CIE Standard Skies. They show various aspects of the sky conditions and the diverse distribution of sky luminance. Affidavit I, Chamaidi Tsiopoulou, hereby declare 1. That I am the sole author of the present Master Thesis, "Calibrated Sky Luminance Maps for Daylight Simulation ", pages, bound, and that I have. When having set the preferred light distribution from all luminaires the average luminance on the walls reached a value of 78 cd/m 2 and at the ceiling cd/m 2. The luminous ratio between the task area and surrounding wall approximately was

  This paper aims to find out representative CIE (International Commission on Illumination) Standard Clear Sky model(s) for three different seasons - winter solstice, equinox, and summer solstice applicable for prevailing clear sky climatic conditions in India [Roorkee]. Indian measured sky luminance distribution database is available only for Roorkee [29°51′ N; 77°53′ E]. The diffuse sky radiation component in the ultraviolet wavelengths is often at least 50% of the global irradiance under clear skies, and is the dominant component of ultraviolet global radiation under translucent overcast skies. The distribution of sky radiance was measured in a rural area and modeled for wavelength bands of ultraviolet-B (UVB, – nm) and ultraviolet-A (UVA, – nm). This paper presents the work on the identification of sky luminance patterns using three common climatic elements, namely cloud cover (CLD), sunshine hour (SH) and clearness index K t. Three sky types representing overcast, partly cloudy and clear were selected from the Kittler et al. 15 standard skies. A Study of Luminance Distribution Patterns and Occupant Preference in Daylit Offices KEVIN VAN DEN WYMELENBERG1,2, MEHLIKA INANICI1 1 University of Washington, College of the Built Environment, Seattle, WA, , USA 2 University of Idaho, Department of Art & Architecture, Boise, ID , USA ABSTRACT: New research in daylighting metrics and developments in validated digital .