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PS Ventilatio n - Smoke extraction -

PS Ventilatio n - Smoke extraction -. Air inlets. Boundary conditions / assumptions:. Only SEVS system Extraction in TR3-TR8, 30 000 m³/h each Air inlets in the galleries corresponding to TR1 and T2

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PS Ventilatio n - Smoke extraction -

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  1. PS Ventilation - Smoke extraction - 2013-02-28

  2. Air inlets Boundary conditions / assumptions: • Only SEVS system • Extraction in TR3-TR8, 30 000 m³/h each • Air inlets in the galleries corresponding to TR1 and T2 • Three cases: With 25 000 m³/h injection in the center, without and with open doors in the center (area 2,5m²) Smokeextractors Center 2013-02-28

  3. Boundary conditions / assumptions: • Extraction: velocity ~5m/s, area 1,7m² (velocity inlets) • Inlets: TR1: 3,0m X 3,4 m; TR2: 3,0 m X 3,4 m (pressure inlets), central – velocity inlet (1,3m X 0,55m) or pressure inlet 1,25m X 2,0m • Tunnel leak tight 2013-02-28

  4. Results 2013-02-28

  5. Conventions + + + + • “r45” means flow rate in the tunnel between the technical room 4 and 5. • Flow rate in tunnels (r12, r23, etc.) is positive when counter-clockwise. • Flow rate in galleries is positive when moving radially from the ring center to the outside. 2013-02-28

  6. Velocity in the tunnel (m/s) With air injection in the center Normal 0.12 0.09 0.14 0.54 0.44 0.46 0.14 0.35 0.33 0.1 0.11 0.3 0.33 0.84 0.86 0.96 0.11 0.05 0.28 0.34 0.3 0.17 0.19 0.16 0.28 0.36 0.08 With doors open in the center 0.33 0.38 1.57 1.24 1.4 1.42 1.59 0.52 0.49 0.49 0.03 1.4 1.19 1.35 1.19 0.66 0.8 0.66 2.67 3.04 2.62 1.07 1.22 1.06 0.15 0.15 0.17 2013-02-28

  7. Velocity in the tunnel in old simulation with small in_TR2 Normal With air injection in the center 0.07 0.05 0.43 0.56 0.35 0.2 0.16 0.33 0.01 0.015 0.99 0.85 0.38 0.35 0.3 0.07 0.11 0.29 0.43 0.33 0.79 0.7 0.76 0.68 0.76 0.14 1.38 1.19 0.74 0.87 3.43 3.96 1.14 1.3 0.23 0.27 2013-02-28

  8. Air flow rates in the tunnel 2013-02-28

  9. Air flow rates in the galleries • Even galleries have smaller cross section • The flow rate values are taken in the center of the gallery (50 meter from the center of the ring) 2013-02-28

  10. Velocity in the galleries 2013-02-28

  11. Normal With doors open in the center With air injection in the center 2013-02-28

  12. Conclusions Conclusions and suggestions: • Central inlet reduces air going from the ring to the galleries • Doors open in the center reduces air going from the ring to the galleries even better than air injection • There is no need to instal the fan to inject the air in the center. Opening the doors (2,5m²) will protect the central room from the smoke from the tunnel • With doors open in the center, in the tunnel lower velocity • Flushing of smoke will be the worst in r56 due to very low flow rate • Openings can significantly change the results – they should be taken into account • Efficiency of smoke extraction depends on the position of the fire • With air injection in the center/doors in the center, less air is taken from two main inlets 2013-02-28

  13. END 2013-02-28

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