Metro Barcellona
Natural Ventilation in a Barcelona metro station: the isovolumes represent the different concentrations of stale air (Red is 85-100% and finally Black is 5-20%). The transient lasts 1.5 hours (real time). The stale air is first diluted and then eventually disappears, substituted by fresh air coming from the train tunnels (0.5 m/s) and from above the ground through the station entrances.
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