Experimental Evaluation of the Discharge Coefficient of a Centre-Pivot Roof Window

Ahsan Iqbal, Alireza Afshari, Per Heiselberg, Anders Høj

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Resumé

Windows are a component of naturally ventilated buildings. The scientific knowledge of how to estimate of airflow rates through windows is limited, especially in the case of centre-pivot roof windows. The flow through this type of windows is traditionally characterized by the orifice plate flow equation. This equation involves a discharge coefficient of the window. The value of the discharge coefficient is the major cause of erroneous estimation of airflow rates. This paper focuses on the experimental study of the discharge coefficient (CD) of a centre-pivot roof window. The measurements were performed in the energy flex house of the Technological Institute - Denmark. The discharge coefficient is evaluated for both inflows and outflows. It is concluded that the use of single value of CD for different flap opening angles is one of the cause of erroneous estimation. Likewise, the value of CD for inflows and outflows are not the same for a given pressure difference. The discharge coefficient varies with sash1 opening angle and flow direction.
OriginalsprogEngelsk
TitelProceedings of CLIMA 2013 : 11th REHVA World Congress and the 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings
RedaktørerKarel Kabele, Miroslav Urban, Karel Suchý, Miloš Lain
Antal sider11
Udgivelses stedPrague
ForlagSociety of Environmental Engineering (STP)
Publikationsdatojun. 2013
ISBN (Elektronisk)978-80-260-4001-9
StatusUdgivet - jun. 2013
BegivenhedCLIMA 2013: 11th REHVA World Congress & 8th International Conference on IAQVEC - Prague, Tjekkiet
Varighed: 16 jun. 201319 jun. 2013

Konference

KonferenceCLIMA 2013
LandTjekkiet
ByPrague
Periode16/06/201319/06/2013

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roof
airflow
inflow
outflow
experimental study
evaluation
energy
rate

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Iqbal, A., Afshari, A., Heiselberg, P., & Høj, A. (2013). Experimental Evaluation of the Discharge Coefficient of a Centre-Pivot Roof Window. I K. Kabele, M. Urban, K. Suchý, & M. Lain (red.), Proceedings of CLIMA 2013: 11th REHVA World Congress and the 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings Prague: Society of Environmental Engineering (STP).
Iqbal, Ahsan ; Afshari, Alireza ; Heiselberg, Per ; Høj, Anders. / Experimental Evaluation of the Discharge Coefficient of a Centre-Pivot Roof Window. Proceedings of CLIMA 2013: 11th REHVA World Congress and the 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings. red. / Karel Kabele ; Miroslav Urban ; Karel Suchý ; Miloš Lain. Prague : Society of Environmental Engineering (STP), 2013.
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title = "Experimental Evaluation of the Discharge Coefficient of a Centre-Pivot Roof Window",
abstract = "Windows are a component of naturally ventilated buildings. The scientific knowledge of how to estimate of airflow rates through windows is limited, especially in the case of centre-pivot roof windows. The flow through this type of windows is traditionally characterized by the orifice plate flow equation. This equation involves a discharge coefficient of the window. The value of the discharge coefficient is the major cause of erroneous estimation of airflow rates. This paper focuses on the experimental study of the discharge coefficient (CD) of a centre-pivot roof window. The measurements were performed in the energy flex house of the Technological Institute - Denmark. The discharge coefficient is evaluated for both inflows and outflows. It is concluded that the use of single value of CD for different flap opening angles is one of the cause of erroneous estimation. Likewise, the value of CD for inflows and outflows are not the same for a given pressure difference. The discharge coefficient varies with sash opening angle and flow direction.",
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Iqbal, A, Afshari, A, Heiselberg, P & Høj, A 2013, Experimental Evaluation of the Discharge Coefficient of a Centre-Pivot Roof Window. i K Kabele, M Urban, K Suchý & M Lain (red), Proceedings of CLIMA 2013: 11th REHVA World Congress and the 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings. Society of Environmental Engineering (STP), Prague, CLIMA 2013, Prague, Tjekkiet, 16/06/2013.

Experimental Evaluation of the Discharge Coefficient of a Centre-Pivot Roof Window. / Iqbal, Ahsan; Afshari, Alireza; Heiselberg, Per; Høj, Anders.

Proceedings of CLIMA 2013: 11th REHVA World Congress and the 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings. red. / Karel Kabele; Miroslav Urban; Karel Suchý; Miloš Lain. Prague : Society of Environmental Engineering (STP), 2013.

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

TY - GEN

T1 - Experimental Evaluation of the Discharge Coefficient of a Centre-Pivot Roof Window

AU - Iqbal, Ahsan

AU - Afshari, Alireza

AU - Heiselberg, Per

AU - Høj, Anders

N1 - Udgivet på usb-stick

PY - 2013/6

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N2 - Windows are a component of naturally ventilated buildings. The scientific knowledge of how to estimate of airflow rates through windows is limited, especially in the case of centre-pivot roof windows. The flow through this type of windows is traditionally characterized by the orifice plate flow equation. This equation involves a discharge coefficient of the window. The value of the discharge coefficient is the major cause of erroneous estimation of airflow rates. This paper focuses on the experimental study of the discharge coefficient (CD) of a centre-pivot roof window. The measurements were performed in the energy flex house of the Technological Institute - Denmark. The discharge coefficient is evaluated for both inflows and outflows. It is concluded that the use of single value of CD for different flap opening angles is one of the cause of erroneous estimation. Likewise, the value of CD for inflows and outflows are not the same for a given pressure difference. The discharge coefficient varies with sash opening angle and flow direction.

AB - Windows are a component of naturally ventilated buildings. The scientific knowledge of how to estimate of airflow rates through windows is limited, especially in the case of centre-pivot roof windows. The flow through this type of windows is traditionally characterized by the orifice plate flow equation. This equation involves a discharge coefficient of the window. The value of the discharge coefficient is the major cause of erroneous estimation of airflow rates. This paper focuses on the experimental study of the discharge coefficient (CD) of a centre-pivot roof window. The measurements were performed in the energy flex house of the Technological Institute - Denmark. The discharge coefficient is evaluated for both inflows and outflows. It is concluded that the use of single value of CD for different flap opening angles is one of the cause of erroneous estimation. Likewise, the value of CD for inflows and outflows are not the same for a given pressure difference. The discharge coefficient varies with sash opening angle and flow direction.

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KW - Discharge coefficient

KW - airflow rates

M3 - Article in proceeding

BT - Proceedings of CLIMA 2013

A2 - Kabele, Karel

A2 - Urban, Miroslav

A2 - Suchý, Karel

A2 - Lain, Miloš

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Iqbal A, Afshari A, Heiselberg P, Høj A. Experimental Evaluation of the Discharge Coefficient of a Centre-Pivot Roof Window. I Kabele K, Urban M, Suchý K, Lain M, red., Proceedings of CLIMA 2013: 11th REHVA World Congress and the 8th International Conference on Indoor Air Quality, Ventilation and Energy Conservation in Buildings. Prague: Society of Environmental Engineering (STP). 2013