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- W624199432 abstract "In this research, in order to evaluate a local ventilation effectiveness, Visitation Frequency (VF; time for contaminant to return back to an objective domain), Tp (average time of contaminant staying in an objective domain) and Purging Flow Rate (PFR; air flow rate for defining domain averaged concentration) are introduced. VF, Tp and PFR of a local domain in the model room are analyzed by particle tracing method based on LES (Large Eddy Simulation). To examine the value of VF, Tp and PFR, 3 kinds of objective domains are set up in the model room (1500(x)×300(y)×1000(z) mm) ; (1) occupant space (1/2 volume of model room), (2) 1/4 volume of occupant space, (3) 1/9 volume of occupant space (Breathing zone). The relative position of the particle generating point and the objective domain (volume) in the model room are changed and the property of VF, Tp and PFR are analyzed. VF and its standard deviation become largest value in the case where the particle generating point is located at the center of the model room, comparing to other cases. It means that the particles generated at the center of the model room, are transported only by turbulent motion and are not likely to be smoothly exhausted from the room. Tp becomes low in the case where particles are generated near the inlet, the outlet or the floor, since the particle generated from these points are transported by the flow in the same stream lines. For cases where particle are generated at the center of the model room, the value of Tp becomes high, due to the closed re-circulation. In PFR analysis, when the local domain becomes smaller, PFR becomes higher for all cases. When particles are generated near the inlet or the outlet, PFR is always bigger than 1.0 in this study." @default.
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- W624199432 date "2000-01-01" @default.
- W624199432 modified "2023-09-27" @default.
- W624199432 title "ANALYSIS OF VISITATION FREQUENCY AND PURGING FLOW RATE THROUGH PARTICLE TRACKING METHOD : Study on evaluation of ventilation effectiveness of occupied space in room" @default.
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- W624199432 doi "https://doi.org/10.3130/aija.65.41" @default.
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