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Evaluation of Discharge Coefficients for Window Openings in Wind Driven Natural Ventilation
Hybrid Ventilation Centre, Department of Civil Engineering, Aalborg University, Aalborg, Denmark.
University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för inomhusmiljö. (Lab Ventilation och Luftkvalité)
2006 (English)In: The International Journal of Ventilation, ISSN 1473-3315, E-ISSN 2044-4044, Vol. 5, no 1, 43-52 p.Article in journal (Refereed) Published
Abstract [en]

This paper describes the classical approach for calculation of wind driven airflow through large openings in buildings and discusses the fulfilment of the limiting assumptions. It is demonstrated that the limiting assumptions are not fulfilled for large openings in buildings for cross ventilation, and therefore, the classical approach is not appropriate for prediction of airflow through large openings in buildings in the cross ventilation case. Using the approach for real openings and estimating the discharge coefficient for window openings has also not been very successful. The discharge coefficient cannot be regarded as a constant and it is very difficult to estimate correct values resulting in less accuracy of prediction of natural ventilation.

Place, publisher, year, edition, pages
2006. Vol. 5, no 1, 43-52 p.
Keyword [en]
CFD; Cross ventilation; Natural ventilation; Orifice equation; Wind tunnel
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:hig:diva-890Scopus ID: 2-s2.0-33748766058OAI: oai:DiVA.org:hig-890DiVA: diva2:117552
Available from: 2008-06-02 Created: 2008-06-02 Last updated: 2016-10-31Bibliographically approved

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