First Considerations on CLIC Cooling System

Ch. Martel, J. Inigo-Golfin

TS/CV

Clic – Primary Water Cooling

• Studies underway for determination of primary cooling source

– Upgrade of studies made in 2001-2002, according to Technical Note 3,

– Determination of overall cooling capacity based on latest information (Carlo Wyss, meetings 13th & 22nd 08/2007),

– Location and siting of cooling plants,

– Determination of preliminary piping section for integration purposes, based on assumed data (inlet temp. ΔT, ΔP and number of circuits – secondary, tertiary, etc.).

– Alternative scenarios already studied in 2001 well advanced. Different layouts (technical caverns, etc) according to technical solution chosen.

Clic – Secondary Water Cooling

• Secondary cooling (demin. water) studies underway

– However basic design information is still missing for some circuits (i.e. cooling of the beam absorbers, klystrons).

– Constraints on water speed in tunnel piping (vibration)?– Agreement on stabilised water requirements? – Assumption UTRB caverns are not necessary. Racks water cooled (600

kW). Tertiary circuits for beam dumps (1 MW). – Requirements so far not optimized w.r.t. piping and tunnel sections

(modules cooling). – Requirements could have severe impact on sizing of access shafts,

tunnels.

Clic – Other Services

• Compressed air?

• Discharge water system. Separation system (oil, sand)?

• Sprinkler or water-mist extinguishing/fire retardant systems in main linac tunnel?

• Idem in experimental/technical caverns?

Clic – HVAC Systems

HVAC possible functions:

• Fresh air and ventilation (obligation)• Overpressure control linked to radiation areas

(obligation)• Safety role: smoke extraction, overpressure, protected

areas, fire fighting, fire protection, purge (obligation)• Dehumidification• Constant ambient conditions: temperature and humidity• Air cooling• Gas extraction• Other

Clic – HVAC Systems

HVAC criteria shall be specified for each structure:

• Detailed definition of the structure (fire volumes, partition, and shielding, plug on head of shaft)

• Required ambient conditions: temperature and humidity• Radiation levels in the various areas• Description of accessible and non accessible areas• Heat dissipation levels in the air (when water cooling not

possible)• Presence of gas, which gas ?• Other

Experimental cavern ventilation

CLIC EXPERIMENTAL CAVERN CROSS SECTION CERN TS/CVVENTILATION PRINCIPLE

Indice A10.11.2007

A ir S upply

E x tra c tion

U A I E -5 1 8

U A E G -5 1 9

U A E G -5 2 0

6 0 0 0 m 3 /hs ta n d b y

G as E x tra c tion

M

U A P E -5 1 5

M

U A P E -5 1 6

U A I E -5 1 7

4 5 0 0 0 m 3 /h

4 5 0 0 0 m 3 /h

M

M

M

M

HEAT DISSIPATION ?

Standard ventilation functions: - fresh air, - air cooling, - emergency & smoke extraction, - gas mixture extraction

Typical LHC Tunnel ventilation

SD

SX

SU

SUH

SH

SUX

Le 25/01/2003

INDICECERN ORGANISATION EUROPEENNE POUR

LA RECHERCHE NUCLEAIRE

EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCHGENEVE

DESIGN W.DATIN

POINT 2 : LHC TUNNEL SUPPLY Principle schematic

LHCU.2299.1100.4

UAPT-204-SU2-1D

MM

MM

BLF

MRE

M

BT2BAE

BAE

M

MM

BAx

L

L

L

L

F

F

BTT

BT2

C

C

BTBBT2

E

E

BT2

E

E

MM

MM

BLF

MRE

MM

UVUM-015

MM

UVUM-015

MM

UVUM-015

MM

UVUM-015

MM

UVUM-015

US25

UL24

UJ24

UA23

PX24

PM25

UW25

UX25UJ23

RE22RA23

UL26UJ26

UA27

RA27

RB26

R21R22To Point 1

To Point 32

BT2

BLF

MRE

BAx BTT BTB BT2 BLF

MRE

CONTROLLED C.MARTEL

UIAA202

UIAO 202UICN201 UOWC

201

Available modes

VENTILATION MODES OF SECTORS 2-1 OR 2-3.2:

Air flow m3/h

Air handling unit

Reduced consumption mode

Accessible tunnel mode (shut down)

Not accessible tunnel mode (LHC run)

Emergency mode (fire or smoke)

9000 UAPT

18000 UAPT

36000 UAPT

64000 UAPT

UICN 201

IT-2795/ST/LHC

PA1D

MRM

PA1G

E

E

M

M

L

L

BT2

BT2

L

L

BTB

BT2

BT2

E

E

BT2

BT2

C

C

L

L

P

P

BTB

BTB

BTB

BTT

BTB

BTT

UAPT-203-SU2-1G

MM

MM

BLF

MRE

M

BT2 BAE

BAE

M

MM

BAx

L

L

L

L

F

F

BTT

BT2

C

C

BTBBT2

E

E

BT2

E

E

MM

MM

BLF

MREBT2

BLF

MRE

BAx BTT BTB BT2 BLF

MRE

MRM

E

E

M

M

L

L

BT2

BT2

L

L

BT2

BT2

E

E

BT2

BT2

C

C

L

L

P

P

BTB

BTB

BTB

BTT

BTB

BTT

Air flow rate according to the selected mode

Nominal airflow = 45000 m3/h

Air flow rate according to the selected mode

UICA206

UICA208

Nominal airflow = 45000 m3/h

UICA207

UICA204

UICA205

UICA202

UICA203

UICA201

7654321 1098 11 1312 14 15 1716 18 2019 21 22

7654321 1098 11 1312 14 15 1716 18 2019

7654321 1098 11 1312 14 15 1716 18 2019 21 22

7654321 1098 11 1312 14 15 1716 18 2019

P

P

0

0

BTA

BRT

BRR

BFY

BLF

MRE

BLF

MRE

BRT

BRR

BFY

MRM

MRM

BLFMRE

BTB BTA

D

D

P

P

0

0

BTB BTA

BTB BTA

Typical CERN LHC sectionLongitunal ventilation

New proposed tunnel sectionTransversal ventilation

TREATED FRESH AIRSUPPLY

90 000 m3/harea=2,2 m2

EXTRACTEDAIR

EXTRACTEDAIR

INSTALLATIONCORRIDOR

TRANSFERTLINES

New proposed tunnel section Transversal ventilation

TREATED FRESH AIRSUPPLY

90 000 m3/harea=2,2 m2

EXTRACTEDAIR

EXTRACTEDAIR

INSTALLATIONCORRIDOR

TRANSFERTLINES

- No ΔT along the tunnel- Better air cooling- Real smoke extraction- Smoke compartmentalization- Safe evacuation- Evolutive capacity

Compatible with new tunnel safety requirements throughout the world

Clic - Conclusions

• Refining of requirements necessary, first version of URD should be issued in the coming months with the main sizing parameters,

• Compromises in the design, in view of the very large numbers involved, not to be dismissed without careful consideration.

Typical CE Tunnel Section

Integration of required pipes

COOLING PIPE(Supply)

COOLING PIPE(Return)