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The night purging of a two-storey atrium building

机译：一栋两层中庭大楼的夜间清洗

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摘要

We examine the fluid mechanics or night purging in a two-storey naturally ventilated atrium building. We develop a mathematical model of a simplified atrium building and focus on the rate at which warm air purges from each storey and the atrium by displacement ventilation into a still cool night environ-ment of a constant temperature. To develop a first insight into how the geometry of the building influences the rate at which warm air purges from each storey via the atrium we neglect heat exchange with the fabric (so there is no thermal buffering) and furthermore assume that the warm air layers in each storey and the atrium are of uniform temperature. The plumes of warm air that rise from the storeys into the atrium, causing the atrium to fill with warm air, have a very strong influence on the night purge. Modelling these as axisymmetric turbulent plumes, we identify three forms of purging behaviour. Each purge is characterised by five key times identified in the progression of the night purge and physical rationale for these differing behaviours is given. An interface velocity deficit and volumetric purge deficit are introduced as measures of the efficiency of a night purge.
机译：我们检查了两层自然通风的中庭建筑的流体力学或夜间净化。我们开发了简化的中庭建筑的数学模型，并着重研究了通过置换通风将空气从两层和中庭吹入到仍然凉爽的夜晚恒温环境中的速率。为了对建筑物的几何形状如何影响通过中庭从每一层吹出暖风的速率产生第一见解，我们忽略了与织物的热交换（因此没有热缓冲），并且还假设暖风在建筑物中分层。每层和中庭温度均一。从楼层上升到中庭的热空气羽流使中庭充满温暖的空气，对夜间吹扫有非常强烈的影响。将它们建模为轴对称的湍流羽状流，我们确定了三种清除行为。每次净化的特点是在夜间净化过程中确定了五个关键时间，并给出了这些不同行为的物理原理。引入界面速度缺陷和体积清除缺陷作为夜间清除效率的量度。

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