LHCb CO2 cooling meeting 2052015 Simone Coelli For the Milano UT group INFN milano 1 Istituto Nazionale di Fisica Nucleare Sezione di Milano TRACI v1 2 TRACI v1 Unit received ID: 791182
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Slide1
Update on UT cooling specifications and status of activities
LHCb CO2 cooling
meeting20/5/2015
Simone CoelliFor the Milano UT groupINFN milano
1
Istituto Nazionale
di Fisica Nucleare
Sezione di
Milano
Slide2TRACI v.12
TRACI v1. Unit
received
in Milano
He
leak
check
in progress to
verify the integrity of the local box valves damaged during the transport
Damaged
valves
bypass control valve
And experiment flux valve
VCR fittings exposed!
Cold
box and
one
dummy
stave
(in progress) + TRACI v1
Slide3Cooling specification document
3
Comments
received
are
being
implemented
to release the revised doc in next days
UT
Power
distribution
Referring
to the 2PACL
operational
conditions
we’re
trying
to converge a
fix
the operative
conditions
fo the
detector,
checking
the
possible
effects
of
different
power
distribution
schemes
the
hypothesis
is
that
the
detector
1- can
be
cooled
2- the
power
can be
applied
until
full
power
without
causing
problems
in the
cooling
system
The detector
need
to start
cold
,
all
the
components
will
beat the minimum
coolant
temperature, i.e. -
30 °
C
Then
any
applied
power
can
change
local
temperatures
but
not
(
only
marginally
)
the
cooling
evaporation
temperature inside
the
channel
(
effect
of
power
has
to be
only
increase
the
oulet
evaporated
fraction
, with a
limit
of 50%, set medium
value
30% for
cooling
design
)
Slide4Test set up 4
Good
progress in the
system
construction
lines
and
sensor connection
Outlet line
inlet
line
Setting
pressure and T sensorCalibration of some sensors
will be done to have absolute
reference
8to
enter
in
t
he (P, T)
diagram
and
find
CO2
enthalpy
with
minimal
error
Plug for He
leak
rate (experiment test)
Safety pressure valve at 110 bar on both lines
Needle
valve with pressure
drop
measurement
Slide5Titanium to swagelok 1/8 glued +
stiffener5
Dummy
stave
with
attached
reworked
fittings
on the
Titanium snake pipe (dummy C central stave)
Glued
joint ARALDITE 2011Ti pipe –SS reworked dummy fittingtested without
stiffener up to 200 bar for several times
Slide6Heating system
6
Heaters
are
goig
to be
bought
..
pipe self-
heating (DC current) will be used as optional heating system
S.U. prototypes hare welcome tobe tested in the cooling system
UT box connection and
manifold
system
Proposal
of connection in progress
Starting
with 4 inlet+4 outlet per UT
half
box
With
internal
manifold
and
capillary
or
swagelok
flow
restrictor
(+
filter
)
One per stave (the smaller ID is 0,254 mm)6LV-4-VCR-6-DM—…010p to….100P
To be
tested
in
real
operation
condition
With
TRACI
A
document
note
will
be prepared with the details
Slide7Back-up slides
7
Slide81 - First step of this test will use a sigle stave dummy.
8
status of activities and plans for this year
PROTOTYPES that could be tested
TYPE C/B/A DUMMY STAVE
HAVING DIFFERENT SNAKE AND HEAT LOAD
S.U. DUMMYIES already tested at Syracuse Un. Using blow-out CO2 plant: SNAKE AND 2 STRAIGHT PIPES
UPWARD/DOWNWARD FLOW
2 STRAIGHT
PIPES DUMMY STAVE, IN CASE OF INTEREST,
COULD BE INVETIGATED UNDER DIFERENT CONNECTIONS
Slide9UT DETECTOR
one
half
box
UNDER INVESTIGATION
USING ONE LONG CAPILLARY/MINIPIPE THAT IS A DISTRIBUTED PRESSURE DROP CONNECTING EACH STAVE
PIPE
INLET; EXTERNAL MANIFOLD
DISTRIBUTED DELTAP
The
detector
coolant distribution system
goal is to give
the correct flow distribution
using
balanced pressure
drop in the circuit
=> THE DEGREE OF FREEDOM WE HAVE IN THE DESIGN IS IN THE
INLET COOLING LINES
(INTERNAL DIAM,
LENGTH
, ROUGHNESS)
This sketch is to satisfy the
“half panel” service
modularity
required
Slide1010
COOLING SPECIFICATIONS
DUMMY STAVESunder study construction
following asap
20W
heaters
20W
heaters
8 W
heaters
titanium
pipe
Real
geometry
Slide1111DUMMY STAVESModel under
study
Trying
to simulate in the dummyreal stave thermal behaviourUsing «
equivalent» thermal
conditionsI will shoe detils next mechanical-cooling meeting
Slide1212
THE PURE
CO2 SATURATION CURVE
CORRELATES TEMPERATURE AND PRESSURE (INSIDE THE EVAPORATION CHANNEL)
- 20 °C TO - 30 °
C COOLING FLUID OPER. TEMP.
=>
10 TO 20 bar COOLING FLUID
OPER. PRESSURE
SU
blow
-off test12-13 bar
Slide1313
H lv (liq.=>
vap
.) = 280 kJ/kgH lv (liq.=> vap.)
LATENT HEAT OF VAPORIZATION
FOR CO2FROM THE CO2 PRESSURE-HENTALPY DIAGRAM
10 TO 20 bar COOLING FLUID
OPER.
PRESSURE
RANGE
At 10 bar (- 40 °C) H lv= 320
kJ/kg