Description
In most new metro and underground transit projects, Platform screen doors (PSD) are installed. This equipment significantly reduces the risk of people falling on to the tracks, either accidentally or for other reasons. However, these platform screen doors may be either full-height or partial height, see NF EN 17168 [1]. In case of a fire, it is tempting to think that full-height PSD will provide a better safety level by separating the track area from the station area, preventing the smoke arising from a fire in one location from spreading to the other location. By working on a typical station configuration with a central track, two lateral platforms, a mezzanine and a ticket room level, this paper compares, using CFD, two smoke removal strategies: one with full-height PSD and the second one with partial height PSD. In order to compare safety levels, we will consider the temperature at height 2m at platform level and the absence of smoke at the mezzanine level. It is shown that in these two configurations, in order to reach the same level of safety, the volume flow to be extracted and the number of ventilation systems (number of fans, ducts, etc.) are much higher with full-height platform screen doors. This has an impact in terms of cost and carbon balance, for a similar safety level.
