Update on UT cooling specifications and status of activities

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LHCb CO2 cooling . meeting. 20/5/2015. Simone . Coelli. For the Milano UT . group. INFN . milano. 1. Istituto Nazionale . di Fisica Nucleare. Sezione di . Milano. TRACI v.1. 2. TRACI v1. Unit . received. ID: 791182 Download

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Update on UT cooling specifications and status of activities




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Presentations text content in Update on UT cooling specifications and status of activities

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

Slide2

TRACI 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

Slide3

Cooling 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

)

Slide4

Test 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

Slide5

Titanium 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

Slide6

Heating 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

Slide7

Back-up slides

7

Slide8

1 - 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

Slide9

UT 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

Slide10

10

COOLING SPECIFICATIONS

DUMMY STAVESunder study construction

following asap

20W

heaters

20W

heaters

8 W

heaters

titanium

pipe

Real

geometry

Slide11

11DUMMY STAVESModel under

study

Trying

to simulate in the dummyreal stave thermal behaviourUsing «

equivalent» thermal

conditionsI will shoe detils next mechanical-cooling meeting

Slide12

12

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

Slide13

13

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


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