ventilation principle for the drive beam tunnel
DESCRIPTION
CLIC WORKSHOP - 2008. VENTILATION PRINCIPLE FOR THE DRIVE BEAM TUNNEL. M Nonis – EN/CV – 28/7/2009 Already presented by C. Martel/ J Inigo Golfin on15 th October 2008. CLIC WORKSHOP - 2008. Agenda. - PowerPoint PPT PresentationTRANSCRIPT
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