| Title |
A study on the design skylight illuminance |
| Abstract |
Increasing the quality of indoor working environments by means of effective daylight utilization is important to building designers, owners and occupants. In order to design daylighting, it is necessary to predict the availability of daylight at each building for all hours of the year. Since measured daylight data are virtually nonexistent, it is common to convert measured irradiance data to illuminance. Total solar radiation data are measured at many meteorological stations. If the luminous efficacy of daylight is known, the illuminances can be calculated from the solar radiation data.This paper presents the main conclusions from a comprehensive literature reviews of luminous efficacies obtained in various parts of the would. Based on these results, it is estimated horizontal global and diffuse illuminance from solar radiation data. Illuminance variation with time of day and time of year at Seoul is analysed, and by using the cumulative occurrence rate curve of the horizontal diffuse illuminance, a design sky illuminance is introduced. |