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Numerical investigation on mechanisms and performance of column attachment ventilation for winter heating
Building and Environment ( IF 7.4 ) Pub Date : 2021-06-05 , DOI: 10.1016/j.buildenv.2021.108025
Haiguo Yin , Yaokun Huo , Yuanyuan Wang , Daina Ji , Jiali Wang , Zhenjun Ma , Angui Li

Column attached ventilation (CAV) is a new form of air distribution based on pillars widely distributed in buildings. Due to thermal buoyancy in the room, the airflow mechanism and performance of CAV is uncertain when it is applied for winter heating, especially in buildings with large space. In this study, a simplified three-dimensional model was established based on a shopping mall. A Computational Fluid Dynamics (CFD) method was employed to simulate the airflow in the room. Archimedes number (Ar) was used to study air distribution and ventilation performance. Results indicated that CAV could be used for room heating, and inertia force was the main driving force of the airflow. In the occupied zone, air velocity and temperature could be controlled by supply air velocity and temperature. Ar was related to air distribution and ventilation effect. In selected cases, Ar less than 2.241 × 10−3 was the prerequisite for effective air distribution. Heat removal effectiveness was linearly related to Ar, and it increased by about 0.01 when Ar reduced by 0.1. CAV saved more energy than mixing ventilation to achieve the same parameters of the occupied zone. These results provide a theoretical basis for the application of CAV in winter conditions.



中文翻译:

冬季采暖立柱附着通风机理及性能数值研究

立柱通风(CAV)是一种基于建筑物中广泛分布的柱子的新型空气分配形式。由于房间内的热浮力,CAV应用于冬季采暖时的气流机制和性能是不确定的,特别是在大空间的建筑物中。在本研究中,基于一个购物中心建立了一个简化的三维模型。采用计算流体动力学 (CFD) 方法来模拟房间内的气流。阿基米德数 (Ar) 用于研究空气分布和通风性能。结果表明,CAV可用于房间供暖,惯性力是气流的主要驱动力。在有人区,风速和温度可以通过送风速度和温度来控制。Ar与空气分布和通风效果有关。−3是有效空气分配的先决条件。散热效果与Ar呈线性相关,Ar每减少0.1,散热效果增加约0.01。CAV 比混合通风节省更多的能量以实现相同的占用区域参数。这些结果为CAV在冬季条件下的应用提供了理论依据。

更新日期:2021-06-10
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