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首页> 外文期刊>Science and Technology for the Built Environment >Wearable personal exhaust ventilation: Improved indoor air quality and reduced exposure to air exhaled from a sick doctor
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Wearable personal exhaust ventilation: Improved indoor air quality and reduced exposure to air exhaled from a sick doctor

机译：可穿戴的个人排气通风系统：改善室内空气质量并减少生病医生呼出的空气的暴露

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Exposure reduction to exhaled air from a sick doctor wearing a personal exhaust unit incorporated in a headset-microphone was studied. Experiments were performed in a full-scale test room furnished as a double-bed hospital room with overhead ventilation at 3, 6, and 12 air changes per hour. Room air temperature was 22 degrees C. A breathing thermal manikin with a body size and shape similar to the body of an average Scandinavian woman was used to mimic a sick doctor. The manikin was equipped with artificial lungs with a realistic breathing cycle (2.5-sec inhalation, 2.5-sec exhalation, and 1-sec pause) and a tidal flow rate of 6 L/min. A second thermal manikin and heated dummy were used to resemble lying patients. Exhaled air by the doctor was mixed with tracer gas to mimic pathogens. The wearable personal exhaust unit was positioned frontally by the mouth of the doctor at three distances: 0.02, 0.04, and 0.06m. It was operated at 0.25 or 0.50 L/s under mixing background ventilation at three air changes per hour. The effect of the wearable exhaust unit geometry by modifying the exhaust surface, as well as the posture of the doctor, standing or seated, was also studied. The use of the wearable personal exhaust resulted in cleaner air in the room compared to mixing alone at 12 air changes per hour, reducing the exposure of the two patients. The nozzle geometry and posture of the doctor affected the indoor exposure to exhaled air. The high potential to capture exhaled air makes the device efficient against airborne pathogens in densely occupied spaces.
机译：研究了佩戴带耳机麦克风的个人排气装置的生病医生暴露于呼出空气中的暴露量减少。在配备有双人床医院病房的大型试验室中进行实验，每小时以3、6和12个换气量进行顶置通风。室温为22摄氏度。使用人体模型和形状类似于普通斯堪的纳维亚妇女身体的呼吸热人体模型来模仿生病的医生。人体模型配备了具有真实呼吸循环（吸入2.5秒，呼气2.5秒和暂停1秒）的人造肺，潮气流速为6 L / min。第二个暖体假人和加热的假人被用来模仿躺着的病人。医生呼出的空气与示踪气体混合以模仿病原体。可穿戴的个人排气装置在医生的嘴前定位在三个距离处：0.02、0.04和0.06m。它在混合背景通风下每小时以0.25或0.50 L / s的速度运转，每小时换气3次。还研究了可穿戴排气单元的几何形状对排气表面的影响，以及医生站立或坐着时的姿势所产生的影响。与每小时以12次换气单独进行混合相比，可穿戴式个人排气装置的使用使房间内的空气更加清洁，从而减少了两名患者的暴露。医生的喷嘴几何形状和姿势会影响室内暴露于呼出空气中。捕获呼出空气的高潜力使该设备对密集空间中的空气传播病原体有效。

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