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In natural ventilation systems fresh air is often provided through opening of windows. However, the knowledge of the performance of windows is rather limited. Computation of natural ventilation air flow through windows is most commonly made using discharge coefficients, that are regarded as being constant.
The reported results show that the discharge coefficient for a window opening cannot be regarded as a constant and that it varies considerably with the size of the opening area, the window type and the temperature difference. Therefore, the use of a constant value can lead to serious errors in the prediction of air flow capacity .
Original languageEnglish
Place of PublicationAalborg
PublisherDept. of Building Technology and Structural Engineering, Aalborg University
Number of pages7
Publication statusPublished - 2000
SeriesIndoor Environmental Engineering

Bibliographical note

In: Air Distribution in Rooms - Ventilation for Health and Sustainable Environment. Proceedings of the 7th International Conference on Air Distribution in Rooms, Reading, UK, July 9-12, 2000, Vol 2, pp. 749-754

PDF for print: 15 pp.


  • Ventilation
  • Windows
  • Air Flow Capacity
  • Natural Ventilation
  • Discharge Coefficient


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