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Diffuse illuminance availability on horizontal and vertical surfaces at Madrid, Spain
Oteiza Sanjose, M. Pilar and Pérez Burgos, Ana
Diffuse illuminance availability on horizontal and vertical surfaces at Madrid, Spain.
"Energy Conversion and Management", v. 64
The overall objective of this work is to provide diffuse illuminance availability at Madrid (Spain) through
a statistical analysis of illuminance values corresponding to a long-term data series. The illuminance values
are obtained from irradiance measurements by means of different empirical models for luminous efficacy. The values of diffuse illuminance on a horizontal and on vertical surfaces facing the four cardinal points are estimated and the different aspects related to daylight availability in an area with specific climatic conditions are analyzed. The experimental data consist of global and diffuse irradiance measurements on a horizontal surface provided by the National Meteorological Agency in Spain (AEMET) for Madrid. These data consist of hourly values measured in the period of 1980–2005. The statistical results
derived correspond to a daylight typical year for the five surfaces considered. This information will be useful to building experts to estimate natural illumination availability when daylighting techniques are applied in building design with the main aim of electric energy savings.
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