Openbare verdediging van het doctoraal proefschrift van Gerlinde De Vogeleer

Titel van het doctoraat: "Reduced measuring strategies to assess ventilation rates in naturally ventilated animal houses"
De publieke verdediging gaat door op 21 april 2017 om 17u in lokaal E2.009, campus Coupure, Coupure links 653, 9000 Gent

Abstract of the doctoral research

A well-designed ventilation system is essential to ensure optimal animal production in agricultural buildings. This, because animal welfare is strongly related to the quality of the air in animal houses. Beside controlling the quality of the indoor air by removing hazardous components as e.g. NH3 and CH4, airflow (rate) assessment is also important to estimate the emissions of these hazardous gases from the buildings.
This PhD research studied the feasibility of reduced measuring strategies using direct velocity measurements to assess ventilation rates in naturally ventilated animal houses. There exists a need for accurate and simple measurement techniques in order to determine emissions from animals cost-efficiently and to improve ventilation control. The possibility of using simple (regression) models using wind velocity measurements at the meteomast and local values in the vents, was investigated to predict the airflow rate through the building and the velocity distribution in the vents. Insight was gained on the influence of reduced sampling locations and varying wind conditions on the accuracy and precision of airflow rate measurements.

It was concluded that no general rule could be applied to reduce sampling locations in the side vents without exceeding an accuracy level of ±20%. The airflow distribution in the vents changed too much depending on wind direction, velocity and obstacle surrounding. Results for the ridge vent were satisfying due to its more constant airflow pattern for different wind conditions. Predicting the airflow distribution in the side vents was possible after calibration the velocities in the vent for different wind conditions. However, care should be taken for complex distributions caused by curtains, internal obstacles and the occurrence of velocity values close to the accuracy level of the anemometer.

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