1 20130116 PS Ventilatio n Run mode results E Da Riva S E Wojnarska 2 20130116 Boundary conditions assumptions Air recirculation system RVS and fresh air system ID: 313408
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Slide1
E. Da Riva, S. E. Wojnarska
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2013-01-16
PS Ventilatio
n
-
Run
mode results -Slide2
E. Da Riva, S. E. Wojnarska
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2013-01-16
Boundary conditions / assumptions:
Air recirculation
system
(RVS)
and fresh air system (
FAVS) are working.
T
he
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
m
3
h
-1
at
Technical
Rooms
inlets
, 5000 m
3
h
-1
at the center of the
ring
RVS: 40000
m
3
h
-1
at TR1 and TR2, 30000
m
3
h
-1
other TRs.
Same pressure at all the air outlets.
Tunnels leaks not taken into account.
Buoyancy and heat transfer neglected.Slide3
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Conventions
“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.
Nominal flow rates
+
+
+
+Slide4
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Inlet layouts
Standard
Magnet-15
Straight-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.Slide5
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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/sSlide6
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Galleries flow rates
Nominal flow rates were expected to be:
+2750 m
3h-1 at big galleries (g1, g3, g5,g7)
-
1500
m
3
h
-1 at 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-1 vs ~0.05 m s-1 )Slide7
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2013-01-16
Velocity profile z=2 and z=3
Standard
Straight-15
Magnet-15Slide8
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Velocity profile r12
Standard
Straight-15
Magnet-15Slide9
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Pathlines „Standard”
FAVS
RVS
R12
R4Slide10
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Pathlines „Straight-15”
FAVS
RVS
R12
R4Slide11
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2013-01-16
Pathlines „Magnet-15”
FAVS
RVS
R12
R4Slide12
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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)Slide13
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END