Effect of ventilation strategy on performance of upper-room ultraviolet germicidal irradiation (UVGI) system in a learning environment
Effect of ventilation strategy on performance of upper-room ultraviolet germicidal irradiation (UVGI) system in a learning environment
复制标题
通风策略对学习环境中上层房间紫外线杀菌照射 (UVGI) 系统性能的影响
DOI：
10.1016/j.scitotenv.2023.165454
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发表时间：
2023
影响因子：
9.8
通讯作者：
Rim, Donghyun
中科院分区：
文献类型：
--
作者：
Park, Seongjun;Mistrick, Richard;Sitzabee, William;Rim, Donghyun
上室紫外线杀菌照射(UVGI)系统作为一种降低室内空气传播病毒感染风险的潜在有效方法，最近受到人们的关注。然而，很少有研究定量评估UVGI系统的通风效果和病毒消毒性能之间的关系。本研究的目的是调查通风策略对教室内细部气流分布和UVGI消毒效果的影响。对典型的制冷、供暖和通风场景进行了三维计算流体动力学(CFD)模拟。结果表明，当通风量为1.1hUVGI1(按ASHRAE62.1计算的最小通风量)时，采用混合风机加强室内空气循环可显著提高−消毒效果，特别是在置换通风降温和全空气采暖条件下。然而，在强制对流冷却条件下，增加室内空气混合量对消毒性能的影响不大。结果还表明，无论室内热状况如何，UVGI系统的消毒效果随着通风效果的接近而增加。此外，当房间平均风速为>；0.1m/S时，对于1μm-10μm的气溶胶，上层房间紫外线灭菌系统可产生约90%的消毒效果。本研究结果表明，室内环境(如教室、医院)的上层房间紫外线灭菌系统应考虑通风策略和居住条件，特别是对于整个空间空气混合不足的有人居住的建筑。
Upper-room ultraviolet germicidal irradiation (UVGI) system is recently in the limelight as a potentially effective method to mitigate the risk of airborne virus infection in indoor environments. However, few studies quantitatively evaluated the relationship between ventilation effectiveness and virus disinfection performance of a UVGI system. The objective of this study is to investigate the effects of ventilation strategy on detailed airflow distributions and UVGI disinfection performance in an occupied classroom. Three-dimensional computational fluid dynamics (CFD) simulations were performed for representative cooling, heating, and ventilation scenarios. The results show that when the ventilation rate is 1.1 h−1(the minimum ventilation rate based on ASHRAE 62.1), enhancing indoor air circulation with the mixing fan notably improves the UVGI disinfection performance, especially for cooling with displacement ventilation and all-air-heating conditions. However, increasing indoor air mixing yields negligible effect on the disinfection performance for forced-convection cooling condition. The results also reveal that regardless of indoor thermal condition, disinfection effectiveness of a UVGI system increases as ventilation effectiveness is close to unity. Moreover, when the room average air speed is >0.1 m/s, upper-room UVGI system could yield about 90% disinfection effect for the aerosol size of 1 μm–10 μm. The findings of this study imply that upper-room UVGI systems in indoor environments (i.e., classrooms, hospitals) should be designed considering ventilation strategy and occupancy conditions, especially for occupied buildings with insufficient air mixing throughout the space.