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Experimental and numerical investigations of indoor air movement distribution with an office ceiling fan

机译：带有办公室吊扇的室内空气流动分布的实验和数值研究

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Ceiling fans provide cooling to indoor occupants and improve their thermal comfort in warm environments at very low energy consumption. Understanding indoor air distribution associated with ceiling fans helps designs when ceiling fans are used. In this study, we systematically investigate the air movement distribution in an unoccupied office room installed with a ceiling fan, as influenced by (1) fan rotational speed, (2) fan blade geometry, (3) ceiling-to-fan depth, and (4) ceiling height. We both measured and simulated air speeds at four heights in the occupied zone according to ANSI/ASHRAE/IES Standard 55 (2013) for seated and standing occupants. CFD predictions were validated by experimental results. In general, numerical results show that for an unoccupied space, the fan blade geometry, ceiling-to-fan depth, and ceiling height only influence air speed profiles within a cylindrical zone directly under a ceiling fan whose diameter is identical to that of the ceiling fan. However, the average speeds within the cylindrical zone at each height are very similar ( 10% in difference) for the different blade shapes studied, indicating a minor influence of blade geometries on occupants' perception of the thermal environment. The results also indicate that the velocity profile remains similar in the main jet zone (the tapered high-velocity zone under the fan blade) for various rotational speeds. The jet impingement on the floor creates radial airflow at the ankle level (0.1 m) across the room, which is not the most effective airflow distribution for cooling occupants.
机译：吊扇为室内居住者提供冷却，并以非常低的能耗在温暖的环境中改善其热舒适性。了解与吊扇相关的室内空气分配有助于使用吊扇的设计。在这项研究中，我们系统地调查了空置办公室中装有吊扇的空气流动分布，该空间受以下因素的影响：（1）风扇转速，（2）风扇叶片的几何形状，（3）天花板到风扇的深度以及（4）天花板高度。根据ANSI / ASHRAE / IES标准55（2013），我们针对坐下和站立的乘员，在占用区的四个高度处测量和模拟了空气速度。通过实验结果验证了CFD的预测。通常，数值结果表明，对于空置空间，风扇叶片的几何形状，吊扇间的深度和吊顶高度仅会影响直径与吊顶直径相同的吊扇正下方的圆柱区域内的风速曲线风扇。但是，对于所研究的不同叶片形状，在每个高度的圆柱区域内的平均速度非常相似（相差<10％），这表明叶片几何形状对乘员对热环境的感知影响较小。结果还表明，在各种转速下，主喷射区（风扇叶片下方的锥形高速区）的速度分布保持相似。喷射流撞击地板会在整个房间的脚踝位置（0.1 m）上产生径向气流，这不是冷却乘员最有效的气流分布。

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