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Dairy barns cooling: Integrated high pressure fogging system with air ventilation and circulation systems
Year:
2007
Authors :
Arbel, Avraham
;
.
Barak, Moti
;
.
Shklyar, Alexander
;
.
Volume :
9 BOOK
Co-Authors:
Arbel, A., ARO, The Volcani Center, Institute of Agricultural Engineering, P.O. Box 6, Bet Dagan, 50250, Israel
Barak, M., ARO, The Volcani Center, Institute of Agricultural Engineering, P.O. Box 6, Bet Dagan, 50250, Israel
Shklyar, A., ARO, The Volcani Center, Institute of Agricultural Engineering, P.O. Box 6, Bet Dagan, 50250, Israel
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Abstract:
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. Two cooling systems were examined under summer conditions. The first one was in open dairy house of two groups separated by the feeding trough. The fogging nozzles were installed alongside the fans lines and feeding lanes. Results indicate that the inside dry bulb temperature (mean) was lower by 4-5 °C than that of the outside, while the wet bulb temperatures almost the same. The second cooling system was in a fattening calfs house. The fogging nozzles were installed on two lines of fans located at both side of the middle lane and facing each other. This house included four ventilation openings and two windows on each longitude opposite walls. As long as the side windows were open these results were similar to those described above. However, when windows were partially closed, further inside dry bulb reduction was achieved to reach total difference of 9-10 °C between inside and outside dry bulb temperatures.
Note:
Related Files :
Circulation
COOLING
Dairy barns
Drops
Evaporative cooling
farm buildings
Fogging
Nozzles
Ventilation
Show More
Related Content
More details
DOI :
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
Conference paper
;
.
Language:
English
Editors' remarks:
ID:
30808
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:57
Scientific Publication
Dairy barns cooling: Integrated high pressure fogging system with air ventilation and circulation systems
9 BOOK
Arbel, A., ARO, The Volcani Center, Institute of Agricultural Engineering, P.O. Box 6, Bet Dagan, 50250, Israel
Barak, M., ARO, The Volcani Center, Institute of Agricultural Engineering, P.O. Box 6, Bet Dagan, 50250, Israel
Shklyar, A., ARO, The Volcani Center, Institute of Agricultural Engineering, P.O. Box 6, Bet Dagan, 50250, Israel
Dairy barns cooling: Integrated high pressure fogging system with air ventilation and circulation systems
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. Two cooling systems were examined under summer conditions. The first one was in open dairy house of two groups separated by the feeding trough. The fogging nozzles were installed alongside the fans lines and feeding lanes. Results indicate that the inside dry bulb temperature (mean) was lower by 4-5 °C than that of the outside, while the wet bulb temperatures almost the same. The second cooling system was in a fattening calfs house. The fogging nozzles were installed on two lines of fans located at both side of the middle lane and facing each other. This house included four ventilation openings and two windows on each longitude opposite walls. As long as the side windows were open these results were similar to those described above. However, when windows were partially closed, further inside dry bulb reduction was achieved to reach total difference of 9-10 °C between inside and outside dry bulb temperatures.
Scientific Publication
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