Parameterisation of the Four Half-Day Daylight Situations

Darula, Stanislav; Kittler, Richard

doi:10.5772/28071

Cited by 1 publication

(1 citation statement)

References 9 publications

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“…It seems, that coupling of the ratio E v,d / E v and T v on the sun altitude to distinguish the differences between cloudy and sunny situations as well as situations without sun. It is important to work with the instantaneous values which better describe observed situations [10,11]. Statistical evaluation of instantaneous measured data can identify differences in the daylight availability not only between locations, but also within the locality due to variability of exterior annual conditions.…”

Section: Sky Luminance Characteristicsmentioning

confidence: 99%

Occurrences of Standard Skies and Luminuos Turbidity Factor in Bratislava

Fabian

Darula

2013

AMR

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Levels of daylighting in nature continually changing and their daily courses are different day to day. Effectiveness of daylight utilisation in buildings depends on exterior luminous conditions resulting from sunny and sunless situations. Generally, prevailing interiors are illuminated by diffuse skylight during year but sunny orientated rooms can be often exposed by direct sunlight. To describe these conditions the occurrence of sky luminance patterns and light attenuation properties of atmosphere expressed e.g. by luminous turbidity factor are needed. This paper presents the comparison and evaluation of occurrences of ISO/CIE General Standard Sky and luminous turbidity factor in two distant years on the base of measured instantaneous global and diffuse horizontal illuminance, global and diffuse horizontal irradiance and zenith luminance taken during 1995 a 2002 at ICA SAS in Bratislava. The different occurrences of luminous situations described by general standard sky types were found. Results of the luminous turbidity factor calculation show that various atmospheric pollutions during sunny situations can be expected.

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Section: Sky Luminance Characteristicsmentioning

confidence: 99%