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PS Ventilatio n - Run mode results -

PS Ventilatio n - Run mode results -. Boundary conditions / assumptions:. Air recirculation system (RVS) and fresh air system ( FAVS) are working.

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PS Ventilatio n - Run mode results -

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  1. PS Ventilation - Run mode results - 2013-01-16

  2. Boundary conditions / assumptions: • Air recirculation system (RVS) and fresh air system (FAVS) are working. • The inlet and outlet surfaces for the RVS will be set at two couples of 0.1 m wide continuous rings placed on the floor (at the sides of the magnet) and at the ceiling • Air flow rates: FAVS: 4000 m3h-1atTechnical Rooms inlets, 5000 m3 h-1 at the center of the ringRVS: 40000 m3 h-1at TR1 and TR2, 30000 m3 h-1other TRs. • Same pressure at all the air outlets. • Tunnels leaks not taken into account. • Buoyancy and heat transfer neglected. 2013-01-16

  3. Conventions Nominal flow rates + + + + • “r45” means flow rate in the tunnel between the technical room 4 and 5. • Flow rate in tunnels (r12, r23, etc.) is positive when counter-clockwise. • Flow rate in galleries is positive when moving radially from the ring center to the outside. 2013-01-16

  4. Inlet layouts Standard Straight-15 Magnet-15 • Flow perpendicular to the inlet. • Perpendicular flow in the left-half of the inlet. • Flow oriented 15° to the right in the right-half. • Flow oriented 15° to the left in the left-half. • Flow oriented 15° to the right in the right-half. • Flow directed downwards in order to impinge the bottom of the magnet. 2013-01-16

  5. Tunnels flow rates • Nominal case: ideally, the air at inlets is expected to evenly split 50% right and 50% left. • With the “Standard” inflow layout, air impinges the wall in front of the inlet, and a swirling counter-current flow occurs. • With the „Straight – 15” the flow is split but still more is going to counter-clock direction. • Only with the “Magnet-15” layout, the air coming from the technical rooms splits to the left and the right. • Volume average velocity Magnitude: Standart – 0,1184 m/s, Straight-15 – 0,1115 m/s, Magnet-15 – 0,1066 m/s 2013-01-16

  6. Galleries flow rates • Nominal flow rates were expected to be: • +2750 m3h-1 at big galleries (g1, g3, g5,g7) • - 1500 m3h-1at small galleries (g2, g4, g6,g8) • CFD results are very different from nominal case and seem to be very sensitive on the inlet layout. • Important to keep an high average velocity in all the galleries in order to extract the activated air. • Globally, the “magnet-15” layout displays the highest average velocity in the galleries (~0.09 m s-1vs ~0.05 m s-1 ) 2013-01-16

  7. Velocity profile z=2 and z=3 Standard Straight-15 Magnet-15 2013-01-16

  8. Velocity profile r12 Standard Straight-15 Magnet-15 2013-01-16

  9. Pathlines „Standard” FAVS RVS R12 R4 2013-01-16

  10. Pathlines „Straight-15” FAVS RVS R12 R4 2013-01-16

  11. Pathlines „Magnet-15” FAVS RVS R12 R4 2013-01-16

  12. Conclusions • „Standard” model is still counter clock wise • The closest to the nominal one is the „Magnet – 15” model • Low velocities in the galleries (the best with Magnet – 15) 2013-01-16

  13. END 2013-01-16

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