1. Comparison of 5 MW fires in UXC with different geometries Michael Plagge Physics Department Compact Muon Solenoid Experiment Group European Organization for Nuclear Research (CERN) Institute of Process Equipment and Environmental Engineering Department of Process Design and Safety Otto-von-Guericke-University Magdeburg, Germany May 10 2012

2. speedventilationfirecap modelopenbigclosedsmallonnormaldoublehalfoffbig Two geometries Five different scenarios >> 10 simulations to perform What kind of fire scenarios should we consider? Reminder: Small fire ≤ 1 MW, big fire ≥1 to 5 MW, (big 2 fire 10 MW) 2

3. Plug closed/open UXC79 UX cavern Shaft Plug closed Outlet on one side of the cavern (outflow only) 5 MW steady fire UXC80 UX cavern Shaft Plug open (outflow only) 5 MW steady fire 3

4. Temperature comparison at t=300 s Left: with plug sealing shaftRight: without plug, free outflow only Temperature plot in Kelvin. 300 K means 300 K and below, 800 K means 800 K and above. 4

5. Temperature comparison at t=600 s Left: with plug sealing shaftRight: without plug, free outflow only Temperature plot in Kelvin. 300 K means 300 K and below, 800 K means 800 K and above. 5

6. Temperature comparison at t=900 s Left: with plug sealing shaftRight: without plug, free outflow only Temperature plot in Kelvin. 300 K means 300 K and below, 800 K means 800 K and above. 6

7. Temperature comparison at t=1200 s Left: with plug sealing shaftRight: without plug, free outflow only Temperature plot in Kelvin. 300 K means 300 K and below, 800 K means 800 K and above. 7

8. Velocity magnitude comparison at t=600 s Left: with plug sealing shaftRight: without plug, free outflow only Velocity magnitude in m/s. Value 5 means 5 m/s and above. 8

9. Velocity magnitude comparison at t=1200 s Left: with plug sealing shaftRight: without plug, free outflow only Velocity magnitude in m/s. Value 5 means 5 m/s and above. 9

10. Pressure comparison at t=1200 s Left: with plug sealing shaftRight: without plug, free outflow only Pressure (dynamic+static) in Pa. Value 100600 Pa and below, 101400 Pa and above. 10

11. Plug open/additional inlet UXC80 UX cavern Shaft Plug open (outflow only) 5 MW steady fire UXC83 UX cavern Shaft Plug open (outflow only) Additional inletOutlet for in- and outflow 5 MW steady fire 11

12. Temperature comparison at t=900 s Left: with plug open Right: plug open and additional inletoutlet Temperature plot in Kelvin. 300 K means 300 K and below, 800 K means 800 K and above. 12

13. Temperature comparison at t=1200 s Left: with plug open Right: plug open and additional inletoutlet Temperature plot in Kelvin. 300 K means 300 K and below, 800 K means 800 K and above. 13

14. Velocity magnitude comparison at t=1200 s Left: with plug open Right: plug open and additional inletoutlet Velocity magnitude in m/s. Value 5 means 5 m/s and above. 14

15. Mass flow comparison 15

16. More “reality”: parametric fire curves From: Ingenieurmethoden des Brandschutzes (Fire safety engineering methods), 2. ed., 2009, also NFPA 92B 16

17. speedventilationfirecap modelopenbigclosedsmallonnormaldoublehalfoffbig Hopefully in three weeks… Reminder: Please don’t forget to worship the IT maintenance god for the “health” of the cluster… Next results on the 31 st May, so the cluster will… 17