Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China; Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8540, Japan.
Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto 615-8540, Japan.
Sci Total Environ. 2022 Apr 10;816:151527. doi: 10.1016/j.scitotenv.2021.151527. Epub 2021 Nov 9.
Aerosols in indoor air have various adverse effects on human health. Considering the use of forced ventilation and fan mixing (individually and in combination), the variation in charge number and their effects on aerosol transmission in confined spaces were explored in this study with the distinction of particle sources. In the case of sources originating from the external space, natural penetration acquires a greater number of negative charges. Forced ventilation of a confined space acts on the fate of particles in the neighboring confined space, while the internal fan has a negligible effect on both the number concentration and charge number of particles in the exterior. The combination of forced ventilation and fan mixing increases charge numbers, altering the lifetime of particles in the external regional environment by deposition or adsorption, particularly for neutralized particles. In the case of sources originating from the interior area, application of an internal fan weakens the ventilation effect from forced ventilation, resulting in internal particle loss by depositing on internal surfaces due to electrostatic charge, increasing the potential risk of resuspension. Additionally, source origin is associated with particle fate, and the charge generated under the action of external forces contributes to the transmission pathways and the fate of the particles in the air. This study investigates the transmission pathways and the fate of aerosols from the perspective of charge number, hopefully contributing to an in-depth understanding of the transmission mechanisms of toxic substances in confined spaces with aerosols as carriers.
室内空气中的气溶胶对人体健康有各种不利影响。考虑到强制通风和风扇混合（单独使用和组合使用）的使用，本研究区分了粒子源，探讨了电荷量的变化及其对封闭空间中气溶胶传播的影响。对于来自外部空间的源，自然渗透获得更多的负电荷。强制通风作用于相邻封闭空间中粒子的命运，而内部风扇对外部空间中粒子的数浓度和电荷数几乎没有影响。强制通风和风扇混合的组合增加了电荷数量，通过沉积或吸附改变了外部区域环境中粒子的寿命，特别是对于中和的粒子。对于来自内部区域的源，内部风扇的应用削弱了强制通风的通风效果，导致由于静电荷而在内表面上沉积的内部粒子损失，增加了再悬浮的潜在风险。此外，源的起源与粒子的命运有关，外力作用下产生的电荷有助于空气中粒子的传播途径和命运。本研究从电荷数量的角度探讨了气溶胶的传播途径和命运，希望有助于深入了解以气溶胶为载体的封闭空间中有毒物质的传播机制。
