Air Flow Measurements In And Around Scale Model Cattle Barns In A Wind Tunnel: Effect Of Ventilation Opening Height

Merlijn De Paepe, Jan Pieters, Wim Cornelis, Donald Gabriels, Bart Merci, Peter Demeyer

    Research output: Contribution to journalA1: Web of Science-articlepeer-review

    Abstract

    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.
    Original languageEnglish
    JournalBiosystems Engineering
    Volume113
    Issue number1
    Pages (from-to)22-32
    Number of pages11
    ISSN1537-5110
    DOIs
    Publication statusPublished - 30-Jun-2012

    Keywords

    • B400-animal-husbandry
    • T230-building-construction

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