Simple tool to evaluate the impact of daylight on building energy consumption

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Abstract

This paper presents a simple building simulation tool for integrated daylight and thermal analysis. The tool is capable of importing the thermal and visual properties for different glazings and shading positions from the Window Information System (WIS) program. Radiosity methodology is used to derive the daylight levels for different sky conditions on an hourly basis. The daylight levels are fed into an existing simple thermal simulation program capable of calculating energy demand and the indoor environment. Straightforward control systems for general and task lighting systems have been implemented together with a shading control strategy that adjusts the shading according to the indoor operative temperature and the profile angle of the sun. The implemented daylight calculation method allows for shades from the window recess and overhang. Comparisons with the raytracing program Radiance show that the accuracy of this approach is adequate for predicting the energy implications of photoresponsive lighting control.
Original languageEnglish
Title of host publicationProceedings of the 8th Symposium on Building Physics in the Nordic Countries
Number of pages1436
Volume1
Place of PublicationCopenhagen
PublisherDanish Society of Engineers, IDA
Publication date2008
Pages119-126
ISBN (Print)978-87-7877-265-7
Publication statusPublished - 2008
EventNordic Sumposium on Building Physics - Copenhagen
Duration: 1 Jan 2008 → …
Conference number: 8th

Conference

ConferenceNordic Sumposium on Building Physics
Number8th
CityCopenhagen
Period01/01/2008 → …

Keywords

  • radiosity
  • building design
  • daylight

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