Projecten per jaar
Uittreksel
Animal houses require an adequate ventilation system to allow for efficient production and, indirectly, high product quality. Indoor air quality is also important in relation to a healthy work and housing environment for both farmer and animal. Furthermore, ventilation is directly linked with emissions of gases with environmental impact, such as ammonia, methane and nitrous oxide. To acquire a better understanding of the complex natural ventilation process in and around animal houses, air velocity measurements were carried out in 1:60 scale models of a dairy cattle house placed in a wind tunnel, using a reference air velocity of 3.5 m s-1. Six different ventilation opening configurations were
compared, in order to quantify their effect on internal and leeward air velocity profiles. The different scale model designs clearly gave rise to variable indoor and outdoor air velocities. Enlarging the inlet opening height led to lower velocities near the inlet, while higher velocities were measured at the outlet. The air velocities at the centre of the house were hardly affected by the inlet opening height, even with the front wall completely removed. Removing the outlet wall at the same time, however led to much higher velocities at the centre of the scale model (3-4 times higher). Higher airflow rates were found in scale models with larger ventilation opening surface areas. The presented results additionally
provide a useful experimental basis towards validation of Computational Fluid Dynamics (CFD) simulations.
compared, in order to quantify their effect on internal and leeward air velocity profiles. The different scale model designs clearly gave rise to variable indoor and outdoor air velocities. Enlarging the inlet opening height led to lower velocities near the inlet, while higher velocities were measured at the outlet. The air velocities at the centre of the house were hardly affected by the inlet opening height, even with the front wall completely removed. Removing the outlet wall at the same time, however led to much higher velocities at the centre of the scale model (3-4 times higher). Higher airflow rates were found in scale models with larger ventilation opening surface areas. The presented results additionally
provide a useful experimental basis towards validation of Computational Fluid Dynamics (CFD) simulations.
Oorspronkelijke taal | Engels |
---|---|
Tijdschrift | Biosystems Engineering |
Volume | 113 |
Exemplaarnummer | 1 |
Pagina's (van-tot) | 22-32 |
Aantal pagina’s | 11 |
ISSN | 1537-5110 |
DOI's | |
Publicatiestatus | Gepubliceerd - 30-jun-2012 |
Trefwoorden
- B400-veeteelt
- T230-constructie-van-gebouwen
Vingerafdruk
Bekijk de onderzoeksthema's van 'Air Flow Measurements In And Around Scale Model Cattle Barns In A Wind Tunnel: Effect Of Ventilation Opening Height'. Samen vormen ze een unieke vingerafdruk.Projecten
- 2 Afgerond
-
NATVENT: Ontwikkeling van een praktijkmeettechniek voor het luchtdebiet en emissies van natuurlijk geventileerde stalsystemen
Demeyer, P., De Vogeleer, G. & Van Overbeke, P.
1/01/11 → 31/12/14
Project: Onderzoek
-
AIRMODEL: Modellering van luchtstromingen en het gedrag van ammoniak in en rond natuurlijk geventileerde stalsystemen
Demeyer, P. & De Paepe, M.
1/01/09 → 31/12/12
Project: Onderzoek