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THE EFFECTIVENESS OF VENTILATION IN PIG FACILITIES: DEVELOPMENT AND PRACTICAL OPERATION OF A NEW MEASURING TECHNIQUE
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: No Citation available.
Authors: A.V. van Wagenberg and M.A.H.H. Smolders
Keywords: Ventilation system evaluation, ventilation performance, effectiveness, pig buildings
It is of vital importance to society and farm economics that pigs are kept in a healthy indoor environment. The ventilation effectiveness of the animal zone determines the amount of air that is necessary to maintain a certain air quality. This project was set up to develop and introduce a measuring technique, which makes it possible to determine the effectiveness of ventilation and the quality of air in the animal zone.
The definition of the ventilation effectiveness (VE) used in this research is based on the momentary contaminant removal effectiveness at an arbitrary point in the animal zone. In a homogeneously mixed airspace, VE is 1. A lower VE indicates short circuiting of air. If VE is higher than 1 this indicates an effective ventilation. The measuring technique developed considers the ventilation effectiveness (VE) for CO 2 and temperature measurements. To this end, momentary values of CO 2 concentrations in incoming air, at animal level and in outgoing air were measured. The CO 2 and temperature data were collected automatically. Manual CO 2 measurements were carried out to give insight into variations in CO 2 in the animal zone.
The practical experiment was carried out in three compartments for weaned piglets. The measurements were done in one compartment with ground-channel ventilation (the air comes into the compartment through a split in the control path), in one compartment with porous ceiling ventilation (the air comes into the compartment through the porous ceiling) and in one compartment with door ventilation (the air comes into the compartment through a hole in the door and flows into the control path).
The technique developed for measurements seems suitable for measuring the effectiveness of the ventilation in a pig facility at an arbitrary point. The average VE calculated based on measurements during one batch of weaned piglets resulted in an average VE for CO 2 and temperature of 1.20 and 1.15 respectively for ground-channel ventilation, 1.01 and 0.85 respectively for porous ceiling ventilation and 1.17 and 0.94 respectively for door ventilation.
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