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

带户外运动场地的自然通风猪舍（NVPBOYs）在世界范围内受到越来越多的关注。人们对NVPBOY内外的空气交换了解甚少，这妨碍了对此类系统的排放和气溶胶扩散的估计。该提案的目的是获得关于开口尺寸、风速、风向、温度、猪活重和猪在猪舍内的实际位置对NVPBOYs通风率（VR）和室内气流模式的影响的基本见解。该项目采用了由风洞实验、农场测量和计算流体力学组成的三支柱模型方法。采用响应面法对NVPBOYs的虚拟现实进行建模。该项目将为NVPBOYs提供VR与室内气流及其影响因素之间的相互作用的基本见解。这允许在结构和气候边界条件以及动物行为的依赖中准确量化VR。预期的研究结果是提供良好的室内环境，估计排放量和了解不同边界条件下圈养动物的气体和气溶胶运输的基础。

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.