The effect of air velocity on heat stress at increased air temperature

Bjarne Schmidt Bjerg, Xiaoshuai Wang, Guoqiang Zhang

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    Abstract

    Increased air velocity is a frequently used method to reduce heat stress of farm animals housed in warm conditions.
    The main reason why the method works is that higher air velocity increases the convective heat release from the animals.
    Convective heat release from the animals is strongly related to the temperature difference between the surfaces of
    animals and the surrounding air, and this temperature difference declines when the air temperature approaches the animal
    body temperature. Consequently it can it by expected that the effect of air velocity decreases at increased air temperature.
    The literature on farm animals in warm conditions includes several thermal indices which incorporate the effect of air
    velocities. But, surprisingly none of them predicts a decreased influence of air velocity when the air temperature
    approaches the animal body temperature.
    This study reviewed published investigations on different categories of farm animals to determine how the effect of
    air velocity depends on the air temperature. A new expression to calculate the chilling effect of increased air velocity
    was suggested. In addition to the parameters air velocity and air temperature this new expression included three constant.
    Generally usable values for two of these constants were suggested but more work is required to determine how the third
    constant depends on different conditions including realistic farm conditions.
    Original languageEnglish
    Publication date2016
    Number of pages5
    Publication statusPublished - 2016
    EventCIGR - AgEng conference - Aarhus, Denmark
    Duration: 26 Jun 201629 Jun 2016

    Conference

    ConferenceCIGR - AgEng conference
    Country/TerritoryDenmark
    CityAarhus
    Period26/06/201629/06/2016

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