Preliminary Investigations of Global Illuminance under Clear and Overcast Sky Conditions Based upon the Measured Data
نویسندگان
چکیده
منابع مشابه
Overcast sky luminances and directional luminous reflectances of objects and backgrounds under overcast skies.
Two sky luminance distributions are given for overcast sky above snow-covered terrain, and directional luminous reflectance data are presented which were obtained under these skies. Luminous reflectances computed from Krinov spectral reflectance data for a variety of natural terrains measured under overcast are also included.
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Time-series measurements of daylight (skylight plus direct sunlight) spectra beneath overcast skies reveal an unexpectedly wide gamut of pastel colors. Analyses of these spectra indicate that at visible wavelengths, overcasts are far from spectrally neutral transmitters of the daylight incident on their tops. Colorimetric analyses show that overcasts make daylight bluer and that the amount of b...
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Several recent studies indicate that our ability to model the transfer of solar flux in the clear atmosphere is still fraught with significant uncertainties (Arking 1996; Charlock and Alberta 1996; Kato et al. 1997; Li et al. 1997; Halthore et. al 1997). The treatment of aerosol is often considered as a more likely source for the discrepancy. Presented here is an analysis of the synergy between...
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چکیده ندارد.
15 صفحه اولA simple evaluation of global and diffuse luminous efficacy for all sky conditions in tropical and humid climate
This paper presents initial values of global and diffuse luminous efficacy at Saint-Pierre (Reunion Island). Firstly, data used were measured for a period of 6 months, from February to June 2008. During this period, all defined day-types have been studied (clear, cloudy and intermediate). Generally, the meteorological database of Reunion does not contain information for illuminance values. On t...
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ژورنال
عنوان ژورنال: Journal of the Illuminating Engineering Institute of Japan
سال: 2002
ISSN: 0019-2341,1349-838X,2185-1506
DOI: 10.2150/jieij1980.86.appendix_122