The Discharge Coefficient of a Centre-Pivot Roof Window

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Resumé

Accuracy in estimation of airflow through windows is the key parameter for modelling and designing of naturally ventilated buildings. The flow through windows is usually described by the orifice flow plate equation. This equation involves the discharge coefficient. In practice, often a constant value of discharge coefficient is used. The constant value of discharge coefficient leads to deceptive airflow estimation in the cases of centre-pivot roof windows. The object of this paper is to study and evaluate the discharge coefficient of the centre pivot roof window. Focus is given on unidirectional flows i.e. inflow and outflow. CFD techniques are used to predict the airflow through the modelled window. Analytical orifice flow equation is used to calculate the discharge coefficient. Results are compared with experimental results. It is concluded that the single value of the discharge coefficient leads to ambiguous estimation of airflow rates. The discharge coefficient decreases with increase in flap opening area. The discharge coefficient also depends upon the flow direction.
OriginalsprogEngelsk
Titel33rd AIVC and 2nd TightVent Conference : Optimising ventilative cooling and airtightness for (nearly) zero-energy buildings, IAQ and comfort: Proceedings
Antal sider4
Udgivelses stedCopenhagen
ForlagAIVC
Publikationsdato2012
Sider 270-273
StatusUdgivet - 2012
Begivenhed33rd AIVC and 2nd TightVent Conference: Optimising ventilative cooling and airtightness for (nearly) zero-energy buildings, IAQ and comfort - Axelborg, København, Danmark
Varighed: 10 okt. 201211 okt. 2012

Konference

Konference33rd AIVC and 2nd TightVent Conference
LokationAxelborg
LandDanmark
ByKøbenhavn
Periode10/10/201211/10/2012

Fingerprint

Roofs
Orifices
Computational fluid dynamics

Bibliografisk note

Konferenceproceedings udleveret på konferencen i trykt form

Emneord

  • Centre pivot roof window
  • Discharge Coefficient
  • CFD

Citer dette

Iqbal, A., Afshari, A., Nielsen, P. V., & Heiselberg, P. (2012). The Discharge Coefficient of a Centre-Pivot Roof Window. I 33rd AIVC and 2nd TightVent Conference: Optimising ventilative cooling and airtightness for (nearly) zero-energy buildings, IAQ and comfort: Proceedings (s. 270-273). Copenhagen: AIVC.
Iqbal, Ahsan ; Afshari, Alireza ; Nielsen, Peter V. ; Heiselberg, Per. / The Discharge Coefficient of a Centre-Pivot Roof Window. 33rd AIVC and 2nd TightVent Conference: Optimising ventilative cooling and airtightness for (nearly) zero-energy buildings, IAQ and comfort: Proceedings. Copenhagen : AIVC, 2012. s. 270-273
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title = "The Discharge Coefficient of a Centre-Pivot Roof Window",
abstract = "Accuracy in estimation of airflow through windows is the key parameter for modelling and designing of naturally ventilated buildings. The flow through windows is usually described by the orifice flow plate equation. This equation involves the discharge coefficient. In practice, often a constant value of discharge coefficient is used. The constant value of discharge coefficient leads to deceptive airflow estimation in the cases of centre-pivot roof windows. The object of this paper is to study and evaluate the discharge coefficient of the centre pivot roof window. Focus is given on unidirectional flows i.e. inflow and outflow. CFD techniques are used to predict the airflow through the modelled window. Analytical orifice flow equation is used to calculate the discharge coefficient. Results are compared with experimental results. It is concluded that the single value of the discharge coefficient leads to ambiguous estimation of airflow rates. The discharge coefficient decreases with increase in flap opening area. The discharge coefficient also depends upon the flow direction.",
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Iqbal, A, Afshari, A, Nielsen, PV & Heiselberg, P 2012, The Discharge Coefficient of a Centre-Pivot Roof Window. i 33rd AIVC and 2nd TightVent Conference: Optimising ventilative cooling and airtightness for (nearly) zero-energy buildings, IAQ and comfort: Proceedings. AIVC, Copenhagen, s. 270-273, 33rd AIVC and 2nd TightVent Conference, København, Danmark, 10/10/2012.

The Discharge Coefficient of a Centre-Pivot Roof Window. / Iqbal, Ahsan; Afshari, Alireza; Nielsen, Peter V.; Heiselberg, Per.

33rd AIVC and 2nd TightVent Conference: Optimising ventilative cooling and airtightness for (nearly) zero-energy buildings, IAQ and comfort: Proceedings. Copenhagen : AIVC, 2012. s. 270-273.

Publikation: Bidrag til bog/antologi/rapport/konference proceedingKonferenceartikel i proceedingForskningpeer review

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Iqbal A, Afshari A, Nielsen PV, Heiselberg P. The Discharge Coefficient of a Centre-Pivot Roof Window. I 33rd AIVC and 2nd TightVent Conference: Optimising ventilative cooling and airtightness for (nearly) zero-energy buildings, IAQ and comfort: Proceedings. Copenhagen: AIVC. 2012. s. 270-273