DYNAMIC CALCULATION OF DAYLIGHTING IN URBAN STRUCTURES

Modem applications for energy saving in buildings need to include dayl ighting. Natural illumination will not only reduce the demand of elect rical energy for fixtures but will also reduce the energy demand of ai r conditioning during a hot period. Conventional approaches consider t he natural illumination of architectural spaces by using a statically sky lumination distribution, e.g. the standard overcast sky according to the German DIN (DIN, 1983). This approach is not sufficient if ener gy saving should be calculated since it does not take the fluctuating sky lumination at the site of the building into account. This defect c an be overcome by extend an existing illumination Simulation program t hat computes only statically by a dynamic routine. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.