VENTILATION PRINCIPLE FOR THE DRIVE BEAM TUNNEL CERN TS/CV Wednesday 9 th July 2008 CLIC.
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Transcript of VENTILATION PRINCIPLE FOR THE DRIVE BEAM TUNNEL CERN TS/CV Wednesday 9 th July 2008 CLIC.
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VENTILATION PRINCIPLEFOR THE DRIVE BEAM
TUNNEL
CERN TS/CVWednesday 9th July 2008
CLIC
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CERN TS/CVWednesday 9th July 2008
- Fresh air for people and ventilation (obligation).- Constant ambient conditions (T°C and humidity).- Remove heat dissipation in air.- Prevent from any air stratification. - Prevent from any condensation.- Purge before access.- Smoke or gas extraction (obligation).- Overpressure control linked to radiation (obligation). - Safety of people, fire brigade access, fire fighting.
CLIC
Tunnel ventilation functions
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CLIC
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
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INJ ECTORLINACS
MAIN BEAMS
DRIVE BEAMS
5 3 1
PHASE 1
90 kW
250 kW
200 kW
CLIC
Heat dissipation
Heat dissipation in the tunnel:250 kW / DB sector1250 kW between two shafts
Corresponding air flow:Delta T°C = 28-18 = 10 °C370 000 m3/h -> 5 vol/h
To be Optimised …
Tunnel section = 16 m2
DB sector volume =14 000 m2
Inter shaft volume = 70 000 m3
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CLIC
Air flow rate considerations
250 kW
1250 kW
470 kW
Tunnel section = 16 m2
DB sector volume =14 000 m2
Inter shaft volume = 70 000 m3
DB sector
Intershafts
Heat dissipationin the tunnel
75 000 m3/h
370 000 m3/h
140 000 m3/h
Air flow rate
1.73 m2
8.56 m2
3.25 m2
Air duct section
1.48 m
3.3 m
2.03 m
Air duct Diameter
Intershafts*
Delta T°C = 28 – 18 = 10°C
* Correct ratio compared to the treated volume
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INJ ECTORLINACS
MAIN BEAMS
DRIVE BEAMS
5 3 1
PHASE 1
CLIC
Air handling principle
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CLIC
Longitudinal principle
SHAFTPOINT
Air supplyNEXTSHAFTPOINT
Extraction
Big air flow rateHigh speedTemperature gradient
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CLIC
Semi transversal principle
SHAFTPOINT
Extraction
Air supply
NEXTSHAFTPOINT
Extraction
Air supply
Small air flow rateLow speedNo gradient temperature
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CLIC
Semi transversal principle
SHAFTPOINT
Extraction
Air supply
NEXTSHAFTPOINT
Extraction
Air supply
Small air flow rateLow speedNo gradient temperature
![Page 10: VENTILATION PRINCIPLE FOR THE DRIVE BEAM TUNNEL CERN TS/CV Wednesday 9 th July 2008 CLIC.](https://reader035.fdocuments.us/reader035/viewer/2022062401/5a4d1b897f8b9ab0599bdb9f/html5/thumbnails/10.jpg)
CLIC
Semi transversal principle
SHAFTPOINT
Extraction
Air supplyExtraction
Air supply
Emergency exit
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CLICAdvantagesof this semi-transversalventilation- Energy recovering point to point- Safety sections possible, smoke extraction- No gradient temperature- Low air speed
AIR SPEED CALCULATION Base tunnel section : 12 m2
Long. Transv. (300 m sectors, 10 grilles/sector)
75 000 m3/h 1.74 m/s 0.01 m/s140 000 m3/h 3.24 m/s 0.019 m/s 370 000 m3/h 30.8 m/s 0.05 m/s
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CLIC
Ø 2.03 m 3.25 m2
Air supply
Extraction
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TREATED FRESH AIRSUPPLY
90 000 m3/harea=2,2 m2
EXTRACTEDAIR EXTRACTED
AIR
INSTALLATIONCORRIDOR
TRANSFERTLINES
CLIC
Tunnel section principles
EXTRACTION AIR SUPPLY
INSTALLATIONCORRIDOR
TRANSFERTLINES
R= 2.5