5/18/2023 0 Comments Breathing zone airflow![]() The results can be used for developing methods to control the long-term and low-contaminant concentration exposures.īreathing zone computational fluid dynamics computer simulated person re-inhalation rate transient breathing cycle. The outdoor airflow rate required in the breathing zone (Vbz) of the occupiable space or spaces in a zone shall be determined in accordance with Equation. By analyzing unsteady inhalation and exhalation airflow characteristics via a CSP with a respiratory system, we also estimated the direct re-inhalation rate of the exhaled air. We present the probabilistic size of the breathing zone for various postures and breathing conditions. We used steady-state computational fluid dynamics (CFD) and a computationally simulated person (CSP). This assumption is reasonable considering that the ventilation time scale of human respiration is sufficiently short compared to the ventilation time scale of a room. Assuming the steady formation of the breathing zone, we propose a procedure for quantitatively identifying a breathing zone formed in front of a human face in the transient condition. (Equation 4-1) where: 403.3.1.1.1.2 Zone Air Distribution Effectiveness The zone air distribution effectiveness ( Ez) shall be determined using Table 403.3.1.1.1.2. The impact of the direction of the personalized flow on the. The outdoor airflow rate required in the breathing zone ( Vbz) of the occupiable space or spaces in a zone shall be determined in accordance with Equation 4-1. The breathing zone of an individual indoors is usually defined as a finite region steadily formed in front of a face. Personalized ventilation aims for supplying clean air to the breathing zone of each occupant.
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