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Spatial analysis of air velocity distribution as affected by house size and design in commercial broiler production facilities.

机译:在商业肉鸡生产设施中,受房屋大小和设计影响的空气流速分布的空间分析。

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摘要

Tunnel ventilation is the design practice of placing exhaust fans and air inlets on opposite ends of animal production facilities and moving air through the building via negative pressure. Increasing air velocity within tunnel ventilated broiler production facilities increases sensible cooling and reduces the need for latent cooling (panting), which improves production efficiency. An air velocity measurement system was developed and measurement density analysis for quantifying air velocity distribution was performed in a 12.19 x 121.9 m commercial broiler production facility. Results showed that axial measurement distances of 3.05 m and 40 measurement points per cross-section produced the most descriptive air velocity distribution maps. Air velocity distribution, mean cross-sectional air velocity, and total facility air flow was assessed in three tunnel ventilated commercial broiler production facilities. These facilities differed in size, design, and equipment configurations (test facility 1 was 18.3 x 170.7 m, test facility 2 was 15.24 x 144.8 m, and test facility 3 was 12.19 x 121.9 m). Air velocity distribution varied within all three facilities. Normalized cross-sectional air velocity was plotted against proportion of total house length to compare the cross-sectional air velocity of the three facilities. House width and physical arrangement of the feed hoppers, heating systems, and tunnel fans are impacting air velocity uniformity and mean cross-sectional air velocity in the three broiler houses.;Precision Livestock Farming (PLF) seeks to improve production efficiency and animal well-being by model based control of animal production facilities. Four broiler production facilities were assessed for spatial bird body weight (BW) variability. The facilities were 15.24 x 144.8 m solid side-wall tunnel ventilated broiler houses containing birds at 58 and 59 d of age. Significant differences in BW were found between birds residing at center house (3.47 kg average) and at the side-walls (3.38 kg average) (P = 0.025). This variability in BW could be attributed to any number of environmental, nutrient, or behavioral causes. A discussion of input/control parameters for PLF management of broiler production is presented. Quantification of performance variability within these facilities and defining models for control of input parameters is essential to making PLF management feasible.
机译:隧道通风是将排风扇和进气口放置在动物生产设施的相对两端,并通过负压使空气通过建筑物的设计实践。隧道通风的肉鸡生产设施内的空气速度提高,可显着冷却,并减少了对潜在冷却(气垫)的需求,从而提高了生产效率。开发了风速测量系统,并在12.19 x 121.9 m的商用肉鸡生产设施中进行了用于量化风速分布的测量密度分析。结果表明,轴向测量距离为3.05 m,每个横截面有40个测量点,产生了最具描述性的空气速度分布图。在三个隧道通风的商用肉鸡生产设施中评估了风速分布,平均横截面风速和设施总气流。这些设施的大小,设计和设备配置有所不同(测试设施1为18.3 x 170.7 m,测试设施2为15.24 x 144.8 m,测试设施3为12.19 x 121.9 m)。在所有三个设施中,风速分布都不同。将归一化的横截面风速与房屋总长度的比例作图,以比较这三个设施的横截面风速。料斗,加热系统和隧道风扇的鸡舍宽度和物理布局正在影响三个肉鸡舍的空气流速均匀性和平均横截面空气流速。精准畜牧业(PLF)旨在提高生产效率和动物健康-通过基于模型的动物生产设施控制。评估了四个肉鸡生产设施的空间禽体重(BW)变异性。设施是15.24 x 144.8 m的固体侧壁隧道通风鸡舍,其中容纳58和59 d年龄的家禽。发现居中的家禽(平均3.47公斤)和侧壁的家禽(平均3.38公斤)之间的体重差异显着(P = 0.025)。 BW的这种可变性可以归因于任何数量的环境,营养或行为原因。提出了对肉鸡生产中PLF管理的输入/控制参数的讨论。量化这些设施内的性能变异性并定义用于控制输入参数的模型对于使PLF管理变得可行至关重要。

著录项

  • 作者

    Luck, Brian David.;

  • 作者单位

    Mississippi State University.;

  • 授予单位 Mississippi State University.;
  • 学科 Engineering Agricultural.
  • 学位 Ph.D.
  • 年度 2013
  • 页码 138 p.
  • 总页数 138
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:41:52

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