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- W583800293 abstract "Since ventilation efficiency in a room is not always uniformly distributed, an index for measuring ventilation efficiency at a concerned point or in a concerned domain is required. To evaluate a local flow field and contaminant distribution, Visitation Frequency (VF, : the times for contaminant to return back to the objective domain) and Purging Flow Rate (PFR, : the air flow rate for defining the domain averaged concentration) are introduced. In this research, VF, Tp (the average time of contaminant staying in the objective domain) and PFR of occupied zone and breathing region in a 2D model room are analyzed through the CFD (Computational Fluid Dynamics) based on the standard k-ε model, in which the prediction results is validated by the precise model experiment. Then, the property of VF, Tp and PFR are analyzed with the various of boundary conditions (1) inlet and outlet position, (2) partitions in occupied space, (3) temperature difference, (4) inlet velocity . In the cases where the exhaust opening is set directly under the supply opening, PFR of occupied zone exceeds 1. It means that those ventilation systems distribute fresh air efficiently to the occupied zone." @default.
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- W583800293 date "2000-01-01" @default.
- W583800293 modified "2023-10-14" @default.
- W583800293 title "STUDY OF VISITATION FREQUENCY AND PURGING FLOW RATE BASED ON AVERAGED CONTAMINANT DISTRIBUTION : Study on evaluation of ventilation effectiveness of occupied space in room" @default.
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- W583800293 doi "https://doi.org/10.3130/aija.65.31_1" @default.
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