Modelling of ventilation rate and airflow patterns of naturally ventilated pig barns with outdoor exercise yards (MNVBOYs)

带有户外运动场的自然通风猪舍(NVPBOY)正受到世界范围内越来越多的关注。NVPBOY外部和内部之间的空气交换知之甚少，这阻碍了对此类系统的排放和气溶胶扩散的估计。这项建议的目的是要深入了解洞口大小、风速、风向、温度、猪只活重和猪只在牛舍内的实际位置对NVPBOY的通风率(VR)和室内气流模式的影响。本项目采用风洞实验、现场测量和计算流体力学相结合的三柱模型方法。采用响应面方法模拟非VPBOY的VR，该项目将为非VPBOY的VR、室内气流及其影响因素之间的相互作用提供基本的见解。这使得可以根据结构和气候边界条件以及动物行为来准确地量化VR。预期的研究结果为提供良好的室内环境、估计排放量以及了解不同边界条件下饲养动物的气体和气溶胶传输奠定了基础。

Naturally ventilated pig barns with outdoor exercise yards (NVPBOYs) are receiving increasing attention worldwide. The air exchange between outside and inside a NVPBOY is poorly understood which prevents estimation of emissions and aerosol dispersion from such systems. The objectives of the proposal are to obtain fundamental insights into the influence of opening size, wind speed, wind direction, temperature, pig live weight and the actual location of the pigs within the barn on the ventilation rate (VR) and indoor airflow pattern of NVPBOYs. The three-pillar model method that consists of wind tunnel experiments, on-farm measurements and computational fluid dynamics is used in this project. Response surface methodology is used for modelling the VR of NVPBOYs.The project will provide fundamental insights into the interaction between VR, indoor airflows and their influencing factors for NVPBOYs. This permits to accurately quantify VR in dependence of the structural and climatic boundary conditions, as well as the animal behaviour. The expected research findings are a basis for providing good indoor environment, for estimating emissions and for understanding gas and aerosol transport for housed animals under different boundary conditions.