РУАЭСТ (RUAEST)
CLASSIFICATION OF DAYLIGHT CONDITIONS IN CLOUD COVER SITUATIONS
Daylight is widely used for the illumination of workspaces and residential interiors the whole year round. Measurements of exterior illuminance at CIE IDMP stations show high variability of daylighting from sunrise to sunset. The changes of sun height, cloud type and cloud cover as well as the turbidity of the atmosphere influence levels of day light availability and daily illuminance sequences. To design and simulate daylighting in buildings the typical exterior conditions are needed. The cloud type, cloud cover and sunshine duration can determine various types of clear, cloudy and overcast days. The study of global and diffuse illuminance sequences based on measurements shows that six types of daily illuminance courses can be classified for daylighting and illuminating engineering calculations. This paper discusses the influence of cloudiness on daily illuminance sequences.