for the VELO evaporator Oscar Augusto on behalf of the VELO Upgrade Cooling Group CERNCNPq attached to Liverpool 1 3 10 16 Power dissipation and pressure flow 04 gs per ID: 785574
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Slide1
Pressure drop measurementsfor the VELO evaporator
Oscar Augusto on behalf of the VELO Upgrade Cooling Group
CERN/CNPq attached to Liverpool
1
3
/
10
/16
Slide2Power dissipation
and
pressure
(flow = 0.4 g/s per microchannel)
13/10/16
Oscar Augusto
2
,
,,,
Power in microchannel A + power in microchannel B
A
B
Accumulator
Pump
Microchannel
TRACI
at
(4krpm)
Slide3Flow by DP characterization
Characterization -20C
DP (bar)
Flow (g/s)
Characterization -20C
0W,
5W,
30W,
40W,
50W,30W -25C (2015)0W -25C (2015)Power dissipation onmicrochannelsDP (bar)Flow (g/s)13/10/16Oscar Augusto3
Min
barMax
bar
Characterization for -20[°C]
Slide4413/10/16
Oscar Augusto
0W,
-25
[°C]
(2016)
5W,
-25 [°C]
(2016)30W,
-25 [°C] (2016)40W, -25 [°C] (2016)30W -25 [°C] (2015)0W -25 [°C] (2015)Power dissipation on microchannelsFlow by DP characterizationCharacterization for -25[°C]
Min
bar
Max
bar
Slide55
13/10/16
Oscar Augusto
0W,
-25 [°C] (2016)
5W,
-25 [°C]
(2016)
30W, -25
[°C] (2016)40W, -25 [°C] (2016)30W -25 [°C] (2015)0W -25 [°C] (2015)Power dissipation on microchannelsFlow by DP characterizationCharacterization for -25[°C]Max
bar for a flow
of 0.6 g/s
Slide6613/10/16
Oscar Augusto
Requirements for
microchannels
Characterization for -25[°C]
Parameter/measure
Unit
Velo
Plant thermal performances
MicrochannelAccu Tmin °C-30Accu Tmax [°C]°C15CO2 T @ exit of the detector evaporator*°C
-28
Stability°C
0.1 °C over a period of one hour
Cool down speed limits (up and down)
°C/min1
Detector expected performances
Max detector T when running @ lowest
Accu T°C
-20
Geometrical constraints
Detector cooling loops
#
26x2
Parallel loops (each one of the 2 half-detectors)
#
26
notes
a bypass is also provided in the isolation vacuum to guarantee constant flow
At the moment, calculations give a pressure drop of 0.2 bar for the transfer lines, with some margin and the junction box, we can assume we never go beyond 0.5 bar, i.e. 1.5 C @ -30 C accumulator T. We make a worst case assumption of a loss of 2 degrees in the transfer line based in Paola’s calculations.
The detector must be guaranteed protection from thermal shocks
Slide7713/10/16
Oscar Augusto
Requirements for
microchannels
Per detector cooling circuit on aged detector taking data at high
lumi
, low temperature
Unit
VELO Microchannels
Max power – HLLT (MAX)W40 W (typical 30 W)Max flow - HLLT @ -30g/s0.6Max Dp - HLLT@ -30bar10.8Min power – HLLT (MAX)W
2
Min flow - HLLT @ -30g/s
0.4
Min Dp - HLLT@ -30
bar
3.9
There should be
a small difference in the flow per module since
the power dissipation is going to
be different (TBC)
Values obtained
at
and
Small
power dissipation in
standby mode. During shutdown periods the detector must be maintained below -20 degrees with power completely off
The
flow might be blocked by the safety system
Highest power dissipation
close to the p-p iteraction region
Transfer lines cooling plant to junction box
#
1
Transfer lines junction box to detector
#
1 outlet + 1 inlet per side
Manifolding
#26 modules per side
Slide8813/10/16
Oscar Augusto
Requirements for
microchannels
40 W per module ( typical 30 W )
0.6g/s per module +
one by-pass per side to cooldown the distribution lines (0.6 g/s each) -> (52+2)*0.6
This
includes the module and the capillaries until the distribution lines
Per detector cooling circuit on new detector during warm commissioning (if needed) Max power @ 15 CWwarm commissioning not expected
Max flow @ 15 C
g/s
Max Dp
@ 15 Cmbar
Power/Flow/pressure drop: full detector summary
Max detector power @ -30
kW1.04 per side; total 2.08 kW
Max total detector flow @ -30
g/s
32.4 (52 mods + 2 bypasses)
Max detector Dp
@ -30 (including capillaries/orifices)bar
10.8 bar
Slide9913/10/16
Oscar Augusto
Plan B: Fluidic characterization
0.8mm pipes and 2x 0.1mm TPG
Total thickness 1.00-1.04mm27 x 49 mm susbrate sizeDesigned to represent half of the full microchannel wafer
Four tiny orifices (4x0.13mm) define the flow and the initial CO2 evaporation point
Designed to represent flow characteristics similar to micro-channel wafers.
TPG
Carbon
fiber
Slide101013/10/16
Oscar Augusto
Plan B: Fluidic characterization
0 W (TRACI
)
22 W (TRACI
)
Min DP 1.7 bar
Max DP 6.7 bar
Min DP 1.7 bar
Max DP 5.6 bar
Slide111113/10/16
Oscar Augusto
Plan B: Fluidic characterization
Parameter/measure
Unit
Velo
Plant thermal performances
Plan B
Accu Tmin °C-35Accu Tmax [°C]°C15CO2 T @ exit of the detector evaporator*°C-33
Per detector cooling circuit on aged detector taking data at high
lumi, low temperature
UnitVELO Plan B
Max flow - HLLT @ -35
g/s0.8
Max
Dp - HLLT@ -35bar
6.7
Min flow - HLLT @ -35
g/s0.4
Min
Dp - HLLT@ -35
bar
1.7
Parameters that are different for Plan B
Max total detector flow @ -35
g/s
43.2 (52 mods + 2 bypasses)
Slide12Conclusion13/10/16Oscar Augusto
12
Slide13Conclusion13/10/16Oscar Augusto
13
Slide14BACKUP
Slide15Flow measurement
Two microchannels
In parallel
Metering
Valve
(
Bypass
)
Closed Valve(Open/close valve - Safety system)Open/Close Valve(Safety system)Bypass open the most possible to
ensure 7 bar over the pump at 4krpm
Bypass Flow
Microchannels Flow
P,T
P,T
The flow through
the by pass is characterized before the
measurements for each temperature set in TRACI
Flowmeter
Pressure
and temperature probes
Total Flow
Total flow =
Bypass FlowPump
speed fixed for the measurements (4krpm)
13/10/16Oscar Augusto
15
Microchannels Flow = 0 g/s
Slide16Flow measurement
Two microchannels
In parallel
Metering
Valve
(
Bypass
)
Closed Valve(Open/close valve - Safety system)Open/Close Valve(Safety system)Bypass Flow
Microchannels Flow
P,T
P,T
Flowmeter
Pressure
and temperature probes
Total Flow
Bypass
open
the
most
possible
to ensure 7 bar over the pump at 4krpm
The flow through the
by pass is characterized before
the measurements for each temperature
set in TRACI13/10/16
Oscar Augusto16Pump speed fixed for
the measurements (4krpm)
Slide17Bypass calibration (TRACI
and 4krpm)
p0 = 0.734639
p1 = 0.374266
p2 = -0.43201
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Oscar Augusto
17
Slide18Two microchannels in parallel (minimal design)
27.2 mm
41.7 mm
27.6 mm
1/8” (ID 1.397 mm)
1/16” (ID 0.5715 mm)
1140 mm
889 mm
Split
Input
1/16” (ID 0.8763 mm)
Output
Split
* 2x320 mm 1/16 “ to the connector in
the module
(Microchannels – Input + output)
M
M
M
41.7 mm
27.6 mm
27.2 mm
CO2GAS
Safety volume between the valves
3/8” (ID 6.223 mm)
1/2” (ID 9.398 mm)
VCR connector 1/8” (~5mm)
CO2 input
CO2 output
Flow
Safety valves (pneumatic)
Flow
Flow
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Oscar Augusto
18
Slide19A
Microchannels A and B
A
B
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Oscar Augusto
19
Slide20Inlet Asics Heaters temperature
(
IAH
)
Outlet Asics Heaters temperature
(
OAH)
Microchannel Outlet temperature (
MCout
)Connector temperature (Con)Temperature probes on the microchannel
Flow
12 ASIC heat mockups
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Oscar Augusto20