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VENTILATION PRINCIPLE FOR THE DRIVE BEAM TUNNEL

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.

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VENTILATION PRINCIPLE FOR THE DRIVE BEAM TUNNEL

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  1. CLIC WORKSHOP - 2008 VENTILATION PRINCIPLEFOR THE DRIVE BEAM TUNNEL M Nonis – EN/CV – 28/7/2009 Already presented by C. Martel/ J Inigo Golfin on15th October 2008

  2. CLIC WORKSHOP - 2008 Agenda • Ventilation functions- Heat dissipation levels- HVAC principles - Tunnel section- Safety considerations - Equipment issues

  3. CLIC WORKSHOP - 2008 Tunnel ventilation functions • 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.

  4. CLIC WORKSHOP - 2008 Heat dissipation in the air Drive Beam sector = 250 kW UTRA cavern = 200 kW Loop = 90 kW 200 kW 90 kW 250 kW Heat dissipation in the Loops & UTRA: 290 kW / DB sector 1450 kW between two shafts Heat dissipation in the tunnel: 250 kW / DB sector 1250 kW between two shafts

  5. CLIC WORKSHOP - 2008 Loop 90 kW Local cooling production UTRA 200 kW

  6. CLIC WORKSHOP - 2008 Tunnel Air flow rate considerations Tunnel section = 20 m2 DB sector volume =17 000 m2 Inter shaft volume = 90 000 m3 Hypothesis: Delta Temperature (Extraction – Supply) = 28 – 18 = 10°C Air flow rate Air duct section Heat dissipation in the tunnel Air duct Diameter 250 kW 1250 kW 500 kW 75 000 m3/h 370 000 m3/h 150 000 m3/h 1.73 m2 8.56 m2 3.3 m2 1.48 m 3.3 m 2 m DB sector Input data Intershafts Intershafts* Limit To be Optimised …

  7. CLIC WORKSHOP - 2008 Air handling from the surface Air supply Extraction Air supply Extraction

  8. CLIC WORKSHOP - 2008 Semi transversal principle Extraction Air supply Extraction Air supply NEXT SHAFT POINT SHAFT POINT Optimisation of the air flow rate Low air speed in the tunnel Optimisation of the gradient temperature Reversible and redundant operation possible Energy recovery possible, recycling of air

  9. CLIC WORKSHOP - 2008 Semi transversal principle Extraction Air supply Extraction Air supply Possible fire resistance sectors with two emergency exits per sector NEXT SHAFT POINT SHAFT POINT 1 Smoke extraction trap per sector 1 supply and extraction grille per 30 mtrs.

  10. CLIC WORKSHOP - 2008 Safety considerations Extraction Air supply Extraction Air supply SHAFT POINT • 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.

  11. CLIC WORKSHOP - 2008 Tunnel section principle

  12. CLIC WORKSHOP - 2008 Not standard industrial fans High pressure fansAdapted products Not standard equipment

  13. CLIC WORKSHOP - 2008 Extraction unit Special design:Fan in specific concrete section Concrete air ductsDirect driven fans (no belts)Fan in specific concrete section Concrete sound attenuation Supply unit

  14. CLIC WORKSHOP - 2008 Lower maintenance needSealedFire resistantModulatedCompressed air control Smoke extraction trap Supply/ extraction grille

  15. CLIC WORKSHOP - 2008 Conclusions • 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

  16. CLIC WORKSHOP - 2008 Longitudinal principle Extraction Air supply NEXT SHAFT POINT SHAFT POINT Large air flow rate High speed Temperature gradient Base: 150 000 m3/h 1250 kW Delta T°C = 24 = (41-17) Air speed = 2 m/s

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