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- W2904606438 abstract "Ventilation configurations greatly influence indoor airflow and pollutant dispersion. This work aims to investigate the effect of vent inlet size (indicated as size ratio D/L, inlet vent length to the cubic root of the room volume) on ventilation performance. A dimensionless time scale ratio (proportional to Ri/α, Richardson number Ri, mass flux ratio α) was proposed to represent ventilation performance assessment. Both methods of experiment and simulation were employed. Studies were conducted for five configurations with various inlet sizes (i.e. D/L ratios equal to 0.2, 0.4, 0.6, 0.8 and 1) under three different air change rates per hour (ACHs; 4, 10 and 16). When keeping the same ACH, the smaller the inlet size (0.2 to 0.6), the larger the inlet ventilation rate. The larger the ACH, the smaller the average CO2 concentration at the outlet, but not within the occupied zone (for D/L ratios of 0.8 and 1, CO2 concentration firstly decreased with ACH of 10 and then increased with ACH of 16). The results demonstrated that Ri/α is smaller for cases with a small size ratio (with the critical value below 10−3) than with larger ones, showing a better pollutant removal performance. These findings can facilitate and improve the initial design for building ventilation." @default.
- W2904606438 created "2018-12-22" @default.
- W2904606438 creator A5000260708 @default.
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- W2904606438 date "2018-12-06" @default.
- W2904606438 modified "2023-10-04" @default.
- W2904606438 title "Ventilation inlets design based on ventilation performance assessment using a dimensionless time scale" @default.
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- W2904606438 doi "https://doi.org/10.1177/1420326x18815321" @default.
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