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Effect of individually controlled personalized ventilation on cross-contamination due to respiratory activities

机译：单独控制个性化通气对呼吸活动引起的交叉污染的影响

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While personalized ventilation (PV) has been integrated to enhance inhaled air quality, some studies showed that it can contribute to contaminants? transport indoors. This work investigates the effect of the individual preferences of PV users on potential cross-contamination in an office. Two occupants were using PV, sitting either face to face or back to face (i.e. in tandem). One of the occupants was infecting the office space through two respiratory activities: coughing and breathing. The PV flowrate control ranged between 0 and 13 l/s, ensuring thermal comfort. A 3-D computational fluid dynamics model was developed and experimentally validated in a climatic chamber equipped with one thermal manikin representing the infected person and a heated dummy representing the healthy person. The cross-contamination was assessed using the inhaled intake fraction (iF) index, which is the ratio of the contaminants? mass inhaled by the healthy person to that exhaled by the infected person. It was found that minimal exposure levels were reached when the infected person used low PV (in the range of 0?4 l/s) for the tandem seating and high PV(in the range of 9?13 l/s) for the face-to-face seating. Furthermore, the average iF for face-to-face seating was 31% lower than that of tandem seating for coughing and 86% for breathing for all possible PV ventilation cases.
机译：虽然个性化通风（PV）已经整合以增强吸入空气质量，但有些研究表明它可以促成污染物？运输室内。这项工作调查PV用户的个人喜好对潜在的交叉污染，在办公室的作用。两个居住者使用PV，任一面坐着面或背面向表面（即串联）。其中的居住者通过两个呼吸道感染活动的办公空间：咳嗽和呼吸。该PV流量控制范围在0和13的L / S，以确保热舒适性。 A 3-d计算流体动力学模型的开发和在装备有一个热人体模型表示感染者和表示健康人加热的虚设气候室实验验证。所述交叉污染是使用吸入吸入率（IF）指数，这是污染物的比率评估？质量吸入由健康的人，通过感染者呼出。已经发现，最小曝光水平时被感染的人使用的低PV（在0〜4 l的范围内/ S）达到了串联座位和高PV（在9〜13 l的范围内/ S）为面-to-面的座位。此外，平均如果面到面的座位为31％比串列座位的降低为咳嗽和呼吸对于所有可能的PV通风情况下86％。

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