Window design : visual and thermal consequences : analysis of the thermal and daylighting performance of windows
conference paper
Selected results of an analysis for the thermal and lighting requirements associated with windows in utility buildings are presented. This analysis concerns the effects of r¡indow size and shape, orientation
and of different ways of supplementing the daylight by artifieial light for a typical office situation in the Netherlands.
Thereby it is assumed that daylight could replace or supplement artificial light whenever it eould supply a specified minimum level of illuminance on the working plane.
The selective operation of a sunshading device is Èaken intó account to prevent glare by direct sunshine.
It is shown that substantíal savings in energy consumption for lighting can be made by a combination of reasonable daylight contribution and a rational switching or dimming policy in response to daylíght variations.
0f those trrro the dinuning system consídered gives the greatest savings.
The reduction in electricity demands for lighting results in less savings on the thermêl requirements. Here Èhe weather loads are noresígnificant than the lighting load. Because of the great variations in the weather conditions considered in this study the authors give preference to the use of reaL weather data in thermal and energy calculations above reference ones.
and of different ways of supplementing the daylight by artifieial light for a typical office situation in the Netherlands.
Thereby it is assumed that daylight could replace or supplement artificial light whenever it eould supply a specified minimum level of illuminance on the working plane.
The selective operation of a sunshading device is Èaken intó account to prevent glare by direct sunshine.
It is shown that substantíal savings in energy consumption for lighting can be made by a combination of reasonable daylight contribution and a rational switching or dimming policy in response to daylíght variations.
0f those trrro the dinuning system consídered gives the greatest savings.
The reduction in electricity demands for lighting results in less savings on the thermêl requirements. Here Èhe weather loads are noresígnificant than the lighting load. Because of the great variations in the weather conditions considered in this study the authors give preference to the use of reaL weather data in thermal and energy calculations above reference ones.
Topics
TNO Identifier
276156
Article nr.
Paper NL 7
Source title
CIE session at Kyoto
Collation
26 p.