6. Conclusion

In a metro tunnel, the smoke ventilation system has a dual purpose: on the one hand, in normal operation, to ensure satisfactory air temperature and sanitary conditions in the tunnel, and on the other, in a fire situation, to limit the spread of smoke as far as possible. From a technical point of view, the principles governing the design and sizing of ventilation systems have been mastered. Design evolutions are nevertheless underway.

First of all, in a context of climate change, limiting summer air temperatures is becoming an increasingly important issue, and this must lead to reflection on the energy efficiency of systems in order to control operating costs.

In terms of fire-related issues, the risk at source is increasingly well controlled by ever more precise standards for rolling stock, which may pave the way for the adaptation of smoke...