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Effects of ceiling fans on airborne transmission in an air-conditioned space

机译：天花板风扇对空调空间空气传输的影响

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摘要

Indoor airborne transmission largely depends on air distribution and ventilation. This study experimentally and numerically investigates steady-state aerosol transmission characteristics in a full-size room using a dedicated outdoor air system coupled with ceiling fans. Tracer gas was used to simulate the exhaled droplet nuclei from the infector, and a breathing thermal manikin was employed as a seated exposed person. Effects of air supply rates, ceiling fan speeds, source positions, and breathing modes of the exposed person on the aerosol transmission were studied. The increase of air change per hour from 4.5 to 5.6 and 7.5 reduced the averaged concentrations at sampling points by 18% and 38%, respectively. The ceiling fans generated local air movement and mixed air within the space, and a higher operating speed contributed to a more uniform concentration distribution. With better dispersion of the aerosols, the ceiling fan operation reduced the concentrations at the exposed person's breathing zone by more than 20%. The ceiling fans show the potential to reduce the cross-infection risk in an airconditioned space.
机译：室内空气传输主要取决于空气分配和通风。本研究通过与吊扇的专用室外空气系统进行了实验和数值研究了全尺寸空间中的稳态气溶胶传输特性。示踪剂气体用于模拟来自感染力的呼出的液滴核，并且呼吸热人体模型被用作坐着的暴露人。研究了空气供应率，吊扇速度，源位置和呼吸模式的空气供应率对气溶胶传输的影响。每小时从4.5到5.6和7.5的空气变化的增加将取样点的平均浓度降低18％和38％。天花板风扇在空间内产生局部空气运动和混合空气，并且更高的操作速度导致更均匀的浓度分布。随着气溶胶的更好分散，吊扇操作将暴露人的呼吸区的浓度降低了20％以上。天花板粉丝显示出减少空调空间中的交叉感染风险的可能性。

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  • 来源
    《Building and Environment》 |2021年第7期|107887.1-107887.12|共12页
  • 作者

    Li Wenxin; Chong Adrian; Hasama Takamasa; Xu Lei; Lasternas Bertrand; Tham Kwok Wai; Lam Khee Poh;

  • 作者单位

    Natl Univ Singapore Sch Design & Environm Dept Bldg 4 Architecture Dr Singapore 117566 Singapore;

    Natl Univ Singapore Sch Design & Environm Dept Bldg 4 Architecture Dr Singapore 117566 Singapore;

    Kajima Tech Res Inst Singapore Singapore Singapore;

    Natl Univ Singapore Sch Design & Environm Dept Bldg 4 Architecture Dr Singapore 117566 Singapore;

    Natl Univ Singapore Sch Design & Environm Dept Bldg 4 Architecture Dr Singapore 117566 Singapore;

    Natl Univ Singapore Sch Design & Environm Dept Bldg 4 Architecture Dr Singapore 117566 Singapore;

    Natl Univ Singapore Sch Design & Environm Dept Architecture Singapore Singapore;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Airborne transmission; Ceiling fan; Air distribution; CFD; Concentration; Infection risk;

    机译：空气传输;吊扇;空气分配;CFD;浓度;感染风险;

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