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LHCb-VELO evaporatorCoBra Calculation and
feed through ideas.
18 February 2015
Bart Verlaat 1
Micro channel numbers
2
Cobra simulation of according previous slide
3
0 0.5 1 1.5 2 2.5 3-40
-35
-30
-25
-20
-15
Velo Upgrade temperature and pressure profile.MF=0.43 g/s, Tsp=-30ºC, Q
app=33 W, Q
env=0 W, x
end=0.25 dP=6.2 bar
Branch length (m)
Tem
pera
ture
(ºC
)
1 23 4 5
1x, D
=0.8
mm
19x,
D=0
.06m
m
19x,
D=0
.15m
m
1x, D
=1.5
mm
¯T
ur R
e=41
75
v
=0.8
m/s
¯T
ur R
e=41
75
v
=0.8
m/s
¯T
ur R
e=41
75
v
=0.8
m/s
¯T
ur R
e=41
75
v
=0.8
m/s
¯T
ur R
e=41
75
v
=0.8
m/s
¯B
ub x
=0.0
9
¯In
t x=
0.25
¯In
t x=
0.25
¯In
t x=
0.25
¯In
t x=
0.25
¯In
t x=
0.25
13
15
17
19
21
23
Pre
ssur
e(B
ar)
T Structure (ºC)
T Tube wall (ºC)
Tsat Fluid (ºC)T Fluid (ºC)
P Fluid (Bar)
CoBra simulation with reduced flow
4
0 0.5 1 1.5 2 2.5 3-40
-38
-36
-34
-32
-30
-28
-26
-24
-22
-20
Velo Upgrade temperature and pressure profile.MF=0.22 g/s, Tsp=-30ºC, Q
app=33 W, Q
env=0 W, x
end=0.5 dP=2.83 bar
Branch length (m)
Tem
pera
ture
(ºC
)
1 23 4 5
1x, D
=0.8
mm
19x,
D=0
.06m
m
19x,
D=0
.15m
m
1x, D
=1.5
mm
¯La
m R
e=20
96
v
=0.4
m/s
¯La
m R
e=20
96
v
=0.4
m/s
¯La
m R
e=20
96
v
=0.4
m/s
¯La
m R
e=20
96
v
=0.4
m/s
¯La
m R
e=20
96
v
=0.4
m/s
¯A
nnu
x=0
.2
¯S
W x
=0.5
¯S
W x
=0.5
¯S
W x
=0.5
¯S
W x
=0.5
¯S
W x
=0.5
11
12
13
14
15
16
17
18
19
20
21
Pre
ssur
e(B
ar)
T Structure (ºC)
T Tube wall (ºC)
Tsat Fluid (ºC)T Fluid (ºC)
P Fluid (Bar)
Flow more reduced……
5
0 0.5 1 1.5 2 2.5 3-40
-38
-36
-34
-32
-30
-28
-26
-24
-22
-20
Velo Upgrade temperature and pressure profile.MF=0.14 g/s, Tsp=-30ºC, Q
app=33 W, Q
env=0 W, x
end=0.75 dP=2.45 bar
Branch length (m)
Tem
pera
ture
(ºC
)
1 23 4 5
1x, D
=0.8
mm
19x,
D=0
.06m
m
19x,
D=0
.15m
m
1x, D
=1.5
mm
¯La
m R
e=13
98
v
=0.2
7 m
/s
¯La
m R
e=13
98
v
=0.2
7 m
/s
¯La
m R
e=13
98
v
=0.2
7 m
/s
¯La
m R
e=13
98
v
=0.2
7 m
/s
¯La
m R
e=13
98
v
=0.2
7 m
/s
¯S
W x
=0.3
1
¯S
W x
=0.7
5
¯S
W x
=0.7
5
¯S
W x
=0.7
5
¯S
W x
=0.7
5
¯S
W x
=0.7
5
10
11
12
13
14
15
16
17
18
19
20
Pre
ssur
e(B
ar)
T Structure (ºC)
T Tube wall (ºC)
Tsat Fluid (ºC)T Fluid (ºC)
P Fluid (Bar)
A reduced flow until X=0.9 => Dryout
6• Interesting the model does not show dry-out• Also very interesting: The pressure drop does not depend on flow!! I’ve never seen that….• Model must be crazy for microchannels, Test, test, test!!!
0 0.5 1 1.5 2 2.5 3-50
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
Velo Upgrade temperature and pressure profile.MF=0.12 g/s, Tsp=-30ºC, Q
app=33 W, Q
env=0 W, x
end=0.89 dP=2.53 bar
Branch length (m)
Tem
pera
ture
(ºC
)
1 23 4 5
1x, D
=0.8
mm
19x,
D=0
.06m
m
19x,
D=0
.15m
m
1x, D
=1.5
mm
¯La
m R
e=11
74
v
=0.2
2 m
/s
¯La
m R
e=11
74
v
=0.2
2 m
/s
¯La
m R
e=11
74
v
=0.2
2 m
/s
¯La
m R
e=11
74
v
=0.2
2 m
/s
¯La
m R
e=11
74
v
=0.2
2 m
/s
¯S
W x
=0.3
7
¯S
W x
=0.8
9
¯S
W x
=0.8
9
¯S
W x
=0.8
9
¯S
W x
=0.8
9
¯S
W x
=0.8
9
10
11
12
13
14
15
16
17
18
19
20
Pre
ssur
e(B
ar)
T Structure (ºC)
T Tube wall (ºC)
Tsat Fluid (ºC)T Fluid (ºC)
P Fluid (Bar)
Reduced power.
7
0 0.5 1 1.5 2 2.5 3-35
-34
-33
-32
-31
-30
-29
-28
-27
-26
-25
Velo Upgrade temperature and pressure profile.MF=86.8 mg/s, Tsp=-30ºC, Q
app=16.5 W, Q
env=0 W, x
end=0.63 dP=1.2 bar
Branch length (m)
Tem
pera
ture
(ºC
)
1 23 4 5
1x, D
=0.8
mm
19x,
D=0
.06m
m
19x,
D=0
.15m
m
1x, D
=1.5
mm
¯La
m R
e=84
0
v
=0.1
6 m
/s
¯La
m R
e=84
0
v
=0.1
6 m
/s
¯La
m R
e=84
0
v
=0.1
6 m
/s
¯La
m R
e=84
0
v
=0.1
6 m
/s
¯La
m R
e=84
0
v
=0.1
6 m
/s
¯S
W x
=0.2
7
¯S
W x
=0.6
3
¯S
W x
=0.6
3
¯S
W x
=0.6
3
¯S
W x
=0.6
3
¯S
W x
=0.6
3
10
11
12
13
14
15
16
17
18
19
20
Pre
ssur
e(B
ar)
T Structure (ºC)
T Tube wall (ºC)
Tsat Fluid (ºC)T Fluid (ºC)
P Fluid (Bar)
Evaporator with connections outside vacuum
8
Connectors outside vacuum
Vacuum connector
Rolled up during handling
Insulation Vacuum
Cooling feed through
9
• 2x 1/8” VCR Gland (D=1/4”)• 1/8” VCR glands without nuts are very
small and fit both through a 14mm hole (10mm would even work)
• A split nut ala IBL can be installed after insertion
Hole diameter 14mm
Braze connection (Cold)
O ring connection (Warn)
1/8” VCR with splitnut
10
D=1/4” (6.35mm)
1/8” VCR with split nutAtlas-IBL cooling line
Cooling feed through and manifold vacuum box
11
Outlet manifoldVelo secondary vacuum
Inlet manifold
Cooling insulation vacuum
Flexible connections
VCR Split nut
Connection details outside vacuum (inside a tertiary vacuum box).
