E. Da Riva, S. E. Wojnarska 12013-04-17

PS Ventilation- Smoke extraction -

E. Da Riva, S. E. Wojnarska 22013-04-17

Boundary conditions / assumptions: Only SEVS system Extraction in TR3-TR8, 30 000 m³/h each Air inlets in the galleries corresponding to TR1 and TR2 Case with open doors in the center (area 2,5m²) Two scenarios – only extractor 3 is working and only extractors 3 and 4 are working

Air inlets

Smoke extractors

Center

E. Da Riva, S. E. Wojnarska 32013-04-17

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

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Results

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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.

+

+

+

+

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Velocity in the tunnel (m/s)Extractors 3 + 4Extractor 3

0.070.21

0.11

0.12

0.11

0.11

0.13

0.26

0.11

0.04

0.44

0.23

0.12

0.050.06

0.005

0.006

0.03 0.130.43

0.24

0.27

0.23

0.23

0.14

0.51

0.23

0.07

0.87

0.46

0.21

0.14 0.130.007

0.007

0.06

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Air flow rates in the tunnel

r12 r23 r34 r45 r56 r67 r78 r81

-40000

-30000

-20000

-10000

0

10000

20000

30000Exctractor 3Extractor 3+4Series3

Air

Flow

Rat

e [m

3/h]

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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)

gallery1 gallery2 gallery3 gallery4 gallery5 gallery6 gallery7 gallery8

-2000

-1000

0

1000

2000

3000

4000

5000Exctractor 3Extractor 3+4Series3

Air

Flo

w R

ate

[m3/

h]

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Velocity in the galleries

gallery1 gallery2 gallery3 gallery4 gallery5 gallery6 gallery7 gallery80.0000

0.0500

0.1000

0.1500

0.2000

0.2500

0.3000

0.3500

0.4000

0.4500

0.5000Exctractor 3Extractor 3+4Series3

Air

Vel

ocity

[m/s

]

2013-04-17 10E. Da Riva, S. E. Wojnarska

Extractors 3 + 4Extractor 3

kg/sin_air_cent 2,76

in_tr1 11,43in_tr2 6,23

m/sin_air_cent 0,9

in_tr1 0,91 in_tr2 0,5

kg/sin_air_cent 1,34

in_tr1 5,73in_tr2 3,13

m/sin_air_cent 0,44

in_tr1 0,46in_tr2 0,25

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Simulations are done with an opening in the central room – this solution was found as the best for the flow in the galleries

The results are as expected: the air is going from both inlets and goes to the right and to the left to finally reach te extractors

The air flow in some galleries (especially 6 and 7) is really low – it is even hard to jugde in which direction the air will go

Velocities in the tunnel are higher when two extractors are working

Conclusions

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END