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Dairy Barns Cooling: Integrated high pressure fogging system with air ventilation and circulation systems

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2007 ASAE Annual Meeting  074123.(doi:10.13031/2013.23058)
Authors:   Avraham Arbel, Mordechi Barak, Alexander Shklyar
Keywords:   Dairy barns, Evaporative cooling, Fogging, Ventilation, Circulation

Evaporative systems for cooling livestock buildings have been developed to provide the desired conditions during the hot season. The fog system is based on spraying the water as small drops (in the fog range, 2-60 µm in diameter) in order to increase the water surface in contact with the air. The free-fall velocity of the drops is slow and the drops are easily carried by the air streams inside the building. These results in a high efficiency of water evaporation combined with keeping the animals and area dry. In the light of these considerations, the following scheme is recommended comprising: roof vents, high volume low speed circulation fans, side vents or fans in all walls and nozzles distributed at the height of the building. The air that enters the building through the roof openings, circulated and carries the water drops with it, and the water evaporates within the flow. As a result, the air is cooled (by water evaporation), both on its entry into the building and in the course of its passage among the animals, and absorbs excess heat.

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