AEN-75: Micro-sprinkler and Fan Cooling for Dairy Cows: Practical Design Considerations
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چکیده
Sprinkler and Fan Cooling Principles In sprinkler and fan cooling, the sprinklers create droplets that wet the cow’s hair coat to the skin. Fans are then used to force air over the cow’s body (see Figure 1), causing evaporative cooling to take place on the skin and hair coat. Heat from the cow’s body causes the moisture to evaporate. The droplet size must be large enough to wet the skin surface and must be applied intermittently to allow time for the moisture to evaporate from the skin. Air movement is needed in fairly humid climates, such as that in Kentucky, to provide enough drier air above the skin to do a good job of evaporating the water. Fog or mist systems (with very fine sprays) are not recommended for dairy cattle in Kentucky because of the humidity levels during the summer. Those systems attempt to cool the air around the cow rather than cooling her skin directly. In the arid West this works well, but in more humid areas, a “steam bath” effect can actually be created. Therefore, for the eastern and midwestern United States, sprinkler and fan cooling should be used rather than fogs or mists.
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