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Computational Fluid Dynamics Analyzing the Air Velocity in a Mechanically-Ventilated Broiler Housing

机译：计算流体动力学分析机械通风的肉鸡舍中的风速

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With the improvements that the environmental control of broiler houses in Brazil there is a need for an alternative and more precise ventilation system.The objective of this study is to evaluate the current ventilation system to a commercial farm for broilers and propose a more efficient ventilation system to determine how many exhaust fans and in which positions should be located for a homogenous and efficient ventilation inside the barn, using the software Ansys(R)CFX 14.The study was conducted in a broiler house located in Amparo/Sao Paulo.The study was done in a tunnel ventilated broiler house totally enclosed with brick side walls.The climatic and environmental conditions were monitored at 2 PM when the birds were 42 days in summer conditions of 2012.Data were collected at 27 equidistant points such as: dry bulb temperature and air velocity, through a hot wire anemometer, relative humidity with a hygrometer and static pressure with a manometer.The control conditions are: inlet air velocity, inlet air temperature,outlet air velocity, outlet air temperature and the static pressure next to the exhaust fans.The geometry was made using the software Ansys(R) Workbench 14.0, the meshes were evaluated by the elements, numbers of node, aspect ratio, element quality and skewness.The validation was done, and a normalised mean square error value (NMSE) of 0.18 was obtained, meaning a good indicator.The Computational Fluid Dynamics (CFD) technique was an effective and feasible method to display the airflow pattern under different operating conditions for exhaust fans in 2D and 3D, as well as to determine the best arrangement of exhaust fans in operation to avoid the areas with low speed and turbulence zone.The best results were observed in simulation 6 where almost all the fans were turned on in the bottom of the building.
机译：随着巴西肉鸡舍环境控制的改善，需要一种替代的，更精确的通风系统。本研究的目的是评估目前用于商业肉鸡场的通风系统，并提出一种更有效的通风系统。使用Ansys（R）CFX 14软件确定多少个排风扇以及应该在仓内进行均匀有效通风的位置。该研究是在位于Amparo /圣保罗的肉鸡场进行的。在完全用砖砌的侧壁封闭的隧道通风的肉鸡舍中进行.2012年夏季，当家禽处于42天时，在下午2点监测气候和环境条件，并在27个等距点收集数据，例如：干球温度通过热线风速计测量风速，使用湿度计测量相对湿度，使用压力计测量静压。控制条件为：进气速度，入口空气温度，出口空气速度，出口空气温度和排风扇旁边的静压力。使用软件Ansys（R）Workbench 14.0制作几何图形，并通过元素，节点数，方面来评估网格比值，元素质量和偏度进行验证，获得的标准化均方误差值（NMSE）为0.18，这是一个很好的指标。计算流体动力学（CFD）技术是一种显示气流的有效可行的方法在2D和3D模式下，排气扇在不同运行条件下的模式，以及确定排气扇在运行中的最佳布置，以避免低速和湍流区域。在模拟6中观察到最佳结果，几乎所有风扇在建筑物底部打开。

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