Effect of Opening the Sash of a Centre-Pivot Roof Window on Wind Pressure Coefficients

Ahsan Iqbal, Hans Wigö, Per Heiselberg, Alireza Afshari

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

2 Citationer (Scopus)

Resumé

This paper describes the effect of outward opening the sash of a window on local and overall wind pressures. Wind tunnel experiments were used for the purpose of evaluation. A centre-pivot roof window on a pitched roof in a modelled scaled building was used in the analysis of wind pressures. The wind pressures were defined in terms of wind pressure coefficients. Traditionally wind pressure coefficients are extracted from the analysis of sealed plain surface. These wind pressure coefficients are used to estimate the natural ventilation rate through windows/openings due to wind effect. Surface averaged wind pressure coefficients do not accurately estimate the airflow rates. Therefore, local wind pressure coefficients are needed especially for dynamic calculation of airflow rates. From the wind tunnel experiments, it is concluded that outward opening the sash can significantly affect the wind pressure distribution nearby the window. The use of wind pressure coefficients from the analysis of sealed plain surface may lead to erroneous estimation of airflow rate.
OriginalsprogEngelsk
Artikelnummer6
TidsskriftInternational Journal of Ventilation
Vol/bind13
Udgave nummer3
Sider (fra-til)273-284
Antal sider12
ISSN1473-3315
DOI
StatusUdgivet - dec. 2014

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Roofs
Wind tunnels
Wind effects
Pressure distribution
Ventilation
Experiments

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title = "Effect of Opening the Sash of a Centre-Pivot Roof Window on Wind Pressure Coefficients",
abstract = "This paper describes the effect of outward opening the sash of a window on local and overall wind pressures. Wind tunnel experiments were used for the purpose of evaluation. A centre-pivot roof window on a pitched roof in a modelled scaled building was used in the analysis of wind pressures. The wind pressures were defined in terms of wind pressure coefficients. Traditionally wind pressure coefficients are extracted from the analysis of sealed plain surface. These wind pressure coefficients are used to estimate the natural ventilation rate through windows/openings due to wind effect. Surface averaged wind pressure coefficients do not accurately estimate the airflow rates. Therefore, local wind pressure coefficients are needed especially for dynamic calculation of airflow rates. From the wind tunnel experiments, it is concluded that outward opening the sash can significantly affect the wind pressure distribution nearby the window. The use of wind pressure coefficients from the analysis of sealed plain surface may lead to erroneous estimation of airflow rate.",
keywords = "Natural ventilation, Wind Pressure Coefficient, centre-pivot roof window, Wind tunnel",
author = "Ahsan Iqbal and Hans Wig{\"o} and Per Heiselberg and Alireza Afshari",
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Effect of Opening the Sash of a Centre-Pivot Roof Window on Wind Pressure Coefficients. / Iqbal, Ahsan; Wigö, Hans; Heiselberg, Per; Afshari, Alireza.

I: International Journal of Ventilation, Bind 13, Nr. 3, 6, 12.2014, s. 273-284 .

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Effect of Opening the Sash of a Centre-Pivot Roof Window on Wind Pressure Coefficients

AU - Iqbal, Ahsan

AU - Wigö, Hans

AU - Heiselberg, Per

AU - Afshari, Alireza

PY - 2014/12

Y1 - 2014/12

N2 - This paper describes the effect of outward opening the sash of a window on local and overall wind pressures. Wind tunnel experiments were used for the purpose of evaluation. A centre-pivot roof window on a pitched roof in a modelled scaled building was used in the analysis of wind pressures. The wind pressures were defined in terms of wind pressure coefficients. Traditionally wind pressure coefficients are extracted from the analysis of sealed plain surface. These wind pressure coefficients are used to estimate the natural ventilation rate through windows/openings due to wind effect. Surface averaged wind pressure coefficients do not accurately estimate the airflow rates. Therefore, local wind pressure coefficients are needed especially for dynamic calculation of airflow rates. From the wind tunnel experiments, it is concluded that outward opening the sash can significantly affect the wind pressure distribution nearby the window. The use of wind pressure coefficients from the analysis of sealed plain surface may lead to erroneous estimation of airflow rate.

AB - This paper describes the effect of outward opening the sash of a window on local and overall wind pressures. Wind tunnel experiments were used for the purpose of evaluation. A centre-pivot roof window on a pitched roof in a modelled scaled building was used in the analysis of wind pressures. The wind pressures were defined in terms of wind pressure coefficients. Traditionally wind pressure coefficients are extracted from the analysis of sealed plain surface. These wind pressure coefficients are used to estimate the natural ventilation rate through windows/openings due to wind effect. Surface averaged wind pressure coefficients do not accurately estimate the airflow rates. Therefore, local wind pressure coefficients are needed especially for dynamic calculation of airflow rates. From the wind tunnel experiments, it is concluded that outward opening the sash can significantly affect the wind pressure distribution nearby the window. The use of wind pressure coefficients from the analysis of sealed plain surface may lead to erroneous estimation of airflow rate.

KW - Natural ventilation

KW - Wind Pressure Coefficient

KW - centre-pivot roof window

KW - Wind tunnel

U2 - 10.5555/2044-4044-13.3.273

DO - 10.5555/2044-4044-13.3.273

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VL - 13

SP - 273

EP - 284

JO - International Journal of Ventilation

JF - International Journal of Ventilation

SN - 1473-3315

IS - 3

M1 - 6

ER -