VENTILATION PRINCIPLEFOR THE DRIVE BEAM

TUNNEL

M Nonis – EN/CV – 28/7/2009Already presented by C. Martel/ J Inigo Golfin on15th October

2008

CLIC WORKSHOP - 2008

Agenda

CLIC WORKSHOP - 2008

- Ventilation functions- Heat dissipation levels- HVAC principles - Tunnel section- Safety considerations - Equipment issues

- Fresh air for people and ventilation (obligation).- Requested ambient conditions (T°C and humidity).- Remove heat loads in air.- Prevent from any air stratification, condensation. - Purge before access.- Smoke or gas extraction (obligation).- Overpressure control linked to radiation (obligation).

- Safety of people, fire brigade access, fire fighting issues.

Tunnel ventilation functions

CLIC WORKSHOP - 2008

INJ ECTORLINACS

MAIN BEAMS

DRIVE BEAMS

5 3 1

PHASE 1

90 kW

250 kW

200 kW

Heat dissipation in the air

Heat dissipation in the tunnel:250 kW / DB sector1250 kW between two shafts

CLIC WORKSHOP - 2008

Drive Beam sector = 250 kWUTRA cavern = 200 kWLoop = 90 kW

Heat dissipation in the Loops & UTRA:290 kW / DB sector1450 kW between two shafts

CLIC WORKSHOP - 2008

200 kW

90 kW

UTRA

Loop

Local coolingproduction

Tunnel Air flow rate considerations

250 kW

1250 kW

500 kW

DB sector

Intershafts

Heat dissipationin the tunnel

75 000 m3/h

370 000 m3/h

150 000 m3/h

Air flow rate

1.73 m2

8.56 m2

3.3 m2

Air duct section

1.48 m

3.3 m

2 m

Air duct Diameter

Intershafts*

Hypothesis: Delta Temperature (Extraction – Supply) = 28 – 18 = 10°C

CLIC WORKSHOP - 2008

To be Optimised …

Tunnel section = 20 m2

DB sector volume =17 000 m2

Inter shaft volume = 90 000 m3

Input data

Limit

INJ ECTORLINACS

MAIN BEAMS

DRIVE BEAMS

5 3 1

PHASE 1

Air handling from the surface

CLIC WORKSHOP - 2008

Air supply

Extraction

Air supply

Extraction

Semi transversal principle

SHAFTPOINT

Extraction

Air supply

NEXTSHAFTPOINT

Extraction

Air supply

Optimisation of the air flow rateLow air speed in the tunnelOptimisation of the gradient temperatureReversible and redundant operation possibleEnergy recovery possible, recycling of air

CLIC WORKSHOP - 2008

CLIC WORKSHOP - 2008Semi transversal principle

SHAFTPOINT

Extraction

Air supply

NEXTSHAFTPOINT

Extraction

Air supply

Possible fire resistance sectors with two emergency exits per sector

1 Smoke extraction trap per sector 1 supply and extraction

grille per 30 mtrs.

Safety considerations

SHAFTPOINT

Extraction

Air supplyExtraction

Air supply

• Possible fire resistant sectors, with emergency exit.• Control of the pressure from both ends of a sector.• Control of the pressure (overpressure in safe area, and extraction in the

critical area).• Fire detection via cable compatible (sensibility with temperature increase)

to fire fighting via water mist.

CLIC WORKSHOP - 2008

Tunnel section principle

EXTRACTION AIR SUPPLY

INSTALLATIONCORRIDOR

TRANSFERTLINES

R= 2.5

CLIC WORKSHOP - 2008

CLIC WORKSHOP - 2008

Not standard industrial fans

High pressure fansAdapted products

Not standard equipment

CLIC WORKSHOP - 2008

Special design:Fan in specific concrete section Concrete air ductsDirect driven fans (no belts)Fan in specific concrete section Concrete sound attenuation

Extraction unit

Supply unit

CLIC WORKSHOP - 2008

Lower maintenance needSealed

Fire resistantModulated

Compressed air control

Smoke extraction trap

Supply/ extraction grille

CLIC WORKSHOP - 2008Conclusions

- Heat dissipation in tunnel air to optimize- Heat dissipations in Exp. caverns, linac to be defined ?- Air duct section to optimize- Integration of ventilation in the tunnel section to finalize HVAC criteria shall be specified for each structure:

• Detailed definition of the structure (fire volumes, partition, and shielding, plug on head of shaft)• Required ambient conditions: temperature and humidity• Radiation levels in the various areas• Description of accessible and non accessible areas• Detailed heat dissipation level in the air (when water cooling not possible)• Presence of gas, which gas ?• Other

Longitudinal principle

SHAFTPOINT

Air supplyNEXTSHAFTPOINT

Extraction

Large air flow rateHigh speedTemperature gradient

CLIC WORKSHOP - 2008

Base:150 000 m3/h1250 kWDelta T°C = 24 = (41-17)Air speed = 2 m/s