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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