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

自然通风的猪舍与户外运动场（NVPBOY）在世界范围内受到越来越多的关注。人们对NVPBOY外部和内部之间的空气交换知之甚少，这妨碍了对此类系统的排放和气溶胶分散的估计。该提案的目的是获得基本的见解，开口大小，风速，风向，温度，猪活重和猪的实际位置在谷仓内的通风率（VR）和室内气流模式的影响NVPBOY。本计画采用风洞实验、现场量测及计算流体力学三柱模型法。响应面方法用于模拟NVPBOY的VR。该项目将为NVPBOY的VR，室内气流及其影响因素之间的相互作用提供基本见解。这允许根据结构和气候边界条件以及动物行为准确地量化VR。预期的研究结果是提供良好的室内环境，估计排放量和了解气体和气溶胶运输的圈养动物在不同的边界条件下的基础。

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.