Numerical Modeling of Indoor Environment with a Ceiling Fan and an Upper-Room Ultraviolet Germicidal Irradiation System.
Numerical Modeling of Indoor Environment with a Ceiling Fan and an Upper-Room Ultraviolet Germicidal Irradiation System.
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DOI：
10.1016/j.buildenv.2013.10.019
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发表时间：
2014-02
影响因子：
7.4
通讯作者：
Nardell EA
中科院分区：
文献类型：
--
作者：
Zhu S;Srebric J;Rudnick SN;Vincent RL;Nardell EA
本研究提出一种数值模拟方法，用于室内环境与吊扇和上层房间紫外线杀菌照射（UR-UVGI）灯具。数值建模采用稳态计算流体动力学（CFD）和旋转参考系来模拟风扇叶片的旋转。计算流体动力学的验证与实验数据的速度场和微生物的分数保留在排气扩散。剩余微生物的分数表示打开UVGI测量的空气微生物浓度与关闭UVGI测量的空气微生物浓度的比率。根据验证结果，CFD模型正确地再现了吊扇旋转引起的空气运动。当环境通风量为2 ACH（每小时换气次数）或6 ACH时，CFD模型准确预测了地板上方2.44 m处的平均垂直速度，误差小于10%，而与吊扇的旋转方向或速度无关。此外，模拟结果还表明，当风扇转速高达235 rpm时，随着环境空气交换率的增加，微生物的残留量也随之增加，这与实验结果相一致。此外，模拟结果准确地预测了当环境空气交换率为2 ACH时剩余的微生物的分数。我们的结论是，这种新的数值模型可以再现吊扇和UR-UVGI灯具对室内环境的影响，并应有助于调查吊扇对UR-UVGI消毒效果的影响。
This study proposes a numerical modeling method for the indoor environment with ceiling fans and upper-room ultraviolet germicidal irradiation (UR-UVGI) fixtures. The numerical modeling deployed steady-state Computational Fluid Dynamics (CFD) with a rotating reference frame to simulate the rotation of fan blades. CFD was validated with experimental data of velocity field and fraction of microorganism remaining at the exhaust diffuser. The fraction of microorganism remaining represented the ratio of the concentration of airborne microorganisms measured with UVGI turned on to the one measured with UVGI turned off. According to the validation results, the CFD model correctly reproduced the air movement induced by the rotation of ceiling fan. When the ambient ventilation rate was 2 ACH (air changes per hour) or 6 ACH, the CFD model accurately predicted the average vertical speeds in the section 2.44 m above the floor with the errors less than 10%, regardless of the ceiling fan's rotational direction or speed. In addition, the simulation results showed that the fraction of microorganism remaining increased with the ambient air exchange rate when the fan blew air downward with a rotational speed as high as 235 rpm, which corresponded with the experimental results. Furthermore, the simulation results accurately predicted the fraction of microorganism remaining when the ambient air exchange rate was 2 ACH. We conclude that this novel numerical model can reproduce the effects of ceiling fans and UR-UVGI fixtures on indoor environment, and should aid in the investigation of the impact of ceiling fans on UR-UVGI disinfection efficacy.
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DOI：
10.1080/15459620701271693
发表时间：
2007-05-01
影响因子：
2
作者：
First, Melvin;Rudnick, Stephen N.;Brickner, Phillip W.
通讯作者：
Brickner, Phillip W.
DOI：
10.2307/2987937
发表时间：
1983-01-01
期刊：
JOURNAL OF THE ROYAL STATISTICAL SOCIETY SERIES D-THE STATISTICIAN
影响因子：
--
作者：
ALTMAN, DG;BLAND, JM
通讯作者：
BLAND, JM
影响因子：
6.9
作者：
Breathnach, AS;de Ruiter, A;French, GL
通讯作者：
French, GL
影响因子：
3.6
作者：
Noakes, C. J.;Sleigh, P. A.;Beggs, C. B.
通讯作者：
Beggs, C. B.
影响因子：
--
作者：
Rudnick, Stephen N.;First, Melvin W.;Nardell, Edward A.
通讯作者：
Nardell, Edward A.