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Classroom aerosol dispersion: desk spacing and divider impacts
International Journal of Environmental Science and Technology ( IF 3.1 ) Pub Date : 2021-07-30 , DOI: 10.1007/s13762-021-03564-z
P Dacunto 1 , D Moser 2 , A Ng 1 , M Benson 2
Affiliation  

A study of aerosol dispersion was conducted in a university classroom using a CO2 tracer gas emitted from three source locations in a steady release, one source location per test. The tracer gas emitted from the single source location represented the potentially infectious aerosol droplets emitted from a single student and was thus a way to examine the influence of one sick student on the rest of the class. Two parameters were adjusted during the testing—the spacing of the desks, which included a spread and compressed configuration, and the inclusion of three-sided clear dividers attached to the student desk surfaces. Tracer dispersion was measured through the use of monitors in 13 locations within the classroom, with eight monitors representing seated student locations, four monitors representing a standing instructor along the classroom front, and one monitor at the return vent in the ceiling. As expected, spacing strongly influenced concentration levels at desks adjacent to the source location. The use of dividers reduced overall student and instructor location tracer concentrations when compared to desks without dividers in most cases. Finally, the influence of air change differences on the results was noted with consistent trends. The experimental construct provides a systematic means for classroom testing that may be broadly applicable to various configurations of classrooms beyond the one tested.

Graphic abstract



中文翻译:

教室气溶胶扩散:课桌间距和隔板影响

在大学教室中使用 CO 2进行了气溶胶扩散研究示踪气体从三个源位置稳定释放,每次测试一个源位置。从单一源位置排放的示踪气体代表了从单个学生排放的潜在传染性气溶胶液滴,因此是一种检查一名生病学生对班级其他学生的影响的方法。在测试过程中调整了两个参数——课桌间距,包括展开和压缩配置,以及连接到学生课桌表面的三边透明隔板。示踪剂扩散是通过在教室内 13 个位置使用监视器测量的,其中 8 个监视器代表坐着的学生位置,4 个监视器代表教室前面的站立教师,1 个监视器位于天花板的回风口。正如预期的那样,间距极大地影响了靠近源位置的办公桌的集中度。在大多数情况下,与没有分隔器的课桌相比,分隔器的使用降低了学生和教师位置示踪剂的总体浓度。最后,注意到空气变化差异对结果的影响,趋势一致。实验结构为课堂测试提供了一种系统化的方法,可以广泛适用于测试之外的各种教室配置。

图形摘要

更新日期:2021-07-30
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