Tracker Thermal Control System TTCS Progress at Sun Yat-sen University Feb. 1, 2006, CERN Geneva...

Tracker Thermal Control System

TTCS Progress TTCS Progress at Sun Yat-sen Universityat Sun Yat-sen University

Feb. 1, 2006, 　 CERN Geneva

Modeling: SS Lu, ZC Huang, DQ Mo, Y Chen EM test: TX Li, KH Guo, WJ Xiao, NQ Pei, XH Sun, ZW Pan, JF Ding, KL YuElectronics: JQ Ni, XH Jiang, D Zhang, ZX Wang, CP Tang,

GC Feng, YH Huang, Mechanics: XM Qi, XH Diao, GY Chen, SS Zheng

by ZH He

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OutlineOutline

• TTCS Power Budget Issue (SYSU/NLR)

• TTCS Test Bed (SYSU)

• TTCB Structure Analysis (SYSU)

• TTCE Status (SYSU/MIT/INFN)

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TTCS Power Budget IssuesTTCS Power Budget Issues

• TTCS power budget definition• 125W (with about 70W beyond TTCS power budget)

was needed to avoid CO2 from freezing in the coldest case, as simulation showed;

• Attempt to reduce this power is made by improving the temperature uniformity on the radiator;

• Current status– Almost no extra power is needed (for primary loop) but with

small margin;

– For a reasonable margin of 10K, about 25W extra power might be needed rarely.

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Model development tree Model development tree ZC HuangZC Huang

NLR V0.3

Fluid models

Combined model draft version 1.0

(cmdv1.0)

Cmdv1.1

TTCB conductive model

TTCB V0.0TTCB dv0.1

Reduced

NLR V0.0

TTCB dv0.2Detailed

Condenser/radiator conductive model

Rad v0.08HP/4nds/0nds



AMS overall modelTracker conductive

model

Tmmv2a

TTCB dv0.3Reduced

TTCB dv0.4Detailed

Cmdv1.2

Cmdv1.3

Modified rad v0.27HP/180nds/45nds

Contact conductance

Cmv1.0

Volume update

Acc model

PleanumTank

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General view of the loop for cmdv1.3General view of the loop for cmdv1.3 ZC Huang ZC Huang

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General view of the loop for cmv1.0 General view of the loop for cmv1.0 DC Mo & ZC HuangDC Mo & ZC Huang

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Main differenceMain difference

Version Cmdv1.3 Cmv1.0

Main descriptioncommon model of NLR and SYSU, draft

version1.2

Loop built by SYSU, but other thermal model are

the same as cmdv1.2

Volume Incorrect correct

Accumulator Boundary Tank, which has limit volume of 1.1 L.

Evaporator length

The top and bottom Evaporator have the

same length. For each, the feed line is

4.5m, the Evapor part is 9m, and return

line is 3.5m.

The top and bottom Evaporator have the different

length. For top, the feed line and the return

line are both 2.5m. For bottom, the feed line

and the return line are both 1.0m.

Evaporator

attached to the

tracker

Total length: 0.405m + 2.2 m + 0.405m +

2.5m + 0.324m + 1.4m + 0.324m +

1.45m = 9.0 m., which length in red is

the part attach to the tracker.

Total length: 2*3.14*0.405m + 2*3.14*0.405m +

2*3.14*0.324m + 2*3.14*0.324m = 9.0 m.

The total length both attach to the tracker.

That in red is the part attach to big ring, while

that in blue to the small ring.

Feed line and

return line in

Rad

The feed lines for both ram side and wake

side are the same, 4.45m. The return

lines for both ram side and wake side

are 4.5m. And there is 1.0m connect

the return line and joint point for each

side.

The feed line and return line for Ram side are

4.41m. For wake side, the feed line and return

are 2.01m.

Converge point

The Ram side , wake side and the tube

which connect Accumulator and loop

are converge in one point (Junc1 here).

The Ram side and wake side joint in one point

(Junc 80). From the point, there is a line 0.25m

long connects to the point (Junc 10 here)

where Acc. connects to the loop.

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b-75_0_0-15_cold for cmdv1.2 b-75_0_0-15_cold for cmdv1.2 (with AF=1.32732e-6m(with AF=1.32732e-6m2,2, di`=1.3mm) di`=1.3mm)

Ti tle

0.0008

0.00085

0.0009

0.00095

0.001

0.00105

0.0011

0.00115

0.94

1.32

1.69

2.07

2.44

2.82

3.19

3.57

3.94

4.32

4.69

5.07

5.44

5.82

6.19

6.57

6.94

7.32

7.69

8.07

8.44

8.82

9.19

9.57

9.94

10.3

Time

FR

top evapbottom evap

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b-75_0_0-15_cold for cmdv1.3b-75_0_0-15_cold for cmdv1.3(with di=2.6mm)(with di=2.6mm)

Ti tle

0.0008

0.00085

0.0009

0.00095

0.001

0.00105

0.94

1.32

1.69

2.07

2.44

2.82

3.19

3.57

3.94

4.32

4.69

5.07

5.44

5.82

6.19

6.57

6.94

7.32

7.69

8.07

8.44

8.82

9.19

9.57

9.94

10.3

Time

FR

top evapbottom evap

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Reverse the flow direction of the condensersReverse the flow direction of the condensers

Original flow direction Reversed flow direction

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Results of Reverse flow in two different Results of Reverse flow in two different models (primary loop)models (primary loop)

cases modelSetpoint

/kSubcooling

/K

liquid length/%

xl of

condenser

inlet

pressure drop/mbar

heaterRam Wake loop condenser

B+75-15-20-15 Cmv1.0 288 0~5.5 0~80 6~91 0.3~0.6 511~856 246~371 No

B+75-15_0-15 Cmv1.0 288 3.3~12.5 31~90 85~95 0.3~0.45 450~530 210~250 No

B+75-15_0-15 Cmdv1.3 288 0.6~13.0 0~91 78~93 0.33~0.49 498~644 272~390 No

B-75_0_0-15 Cmv1.0 258 10.6~11.6 ~92.6 ~92.6 ~0.32 700 32050W on

TTCB HX

B-75_0_0-15 Cmdv1.3 258 17.6~20. 94~96 93~96 0.16~0.23 437~620 233~312 40W

Flow rate=2g/s

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RAM condenser cold areaRAM condenser cold area

42 41 40 39 38 3743 3644 31 32 33 34 3545 3046 29 28 27 26 2547 2448 19 20 21 22 2349 1850 17 16 15 14 1351 1252 7 8 9 10 1153 654 5 4 3 2 1

42 41 40 39 38 3743 3644 31 32 33 34 3545 3046 29 28 27 26 2547 2448 19 20 21 22 2349 1850 17 16 15 14 1351 1252 7 8 9 10 1153 654 5 4 3 2 1

-55-55CC

-55-55CC

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Temperature along the condenser pipesTemperature along the condenser pipes

Cold case of B-75 0 0-15Original with 125WReversed with 40W (or less)

Hot case of B+75-15-20-15

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Reversed flow Reversed flow (with 40W)(with 40W)

T~20KT~20K

Original flow Original flow (with 125W)(with 125W)

T~40KT~40K

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T along the tracker lumps, top evaporatorT along the tracker lumps, top evaporator

evap

288.25

288.3

288.35

288.4

288.45

288.5

.TL13 L1005 L2002 .TL16 L3004 .TL18 L4004 .TL20

evap

Max dT=0.14K for hot case

evap

258.35258.4

258.45258.5

258.55258.6

258.65258.7

258.75

.TL13 L1005 L2002 .TL16 L3004 .TL18 L4004 .TL20

Ti me=14

Max dT=0.45K for cold case

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Temperature distribution of hybrids layersTemperature distribution of hybrids layers

Case: B-75_0_0-15_cold

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Temperature distribution of hybrids layers IITemperature distribution of hybrids layers II

Case: B+75-15_0-15_hot

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Average temperature of hybrid layersAverage temperature of hybrid layers

Hybrids 1 2 3 4 5 6 7 8

hot T/K 291.2 294.2 295.9 298.3 298.3 295.8 294.1 291.0

cold T/K 261.5 264.8 266.4 268.8 268.8 266.4 264.8 261.5

This meets the Requirement by Tracker

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Brief summary for uniformityBrief summary for uniformity

• Radiator is more uniform after reversing the

flow direction.

– Reduced heating power to avoid freezing

– No big effect to the hot case.

– Making the radiator working more efficiently

• More detail check is still needed for the models.

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TTCS Power Budget Issues Summary (I)TTCS Power Budget Issues Summary (I)

• Improving the temperature uniformity in the condensers and radiators, e.g., by reversing the flow direction of CO2 in the condenser, is very helpful for reducing the heating power to avoid CO2 from freezing in the condensers.

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TTCS Power Budget Issues Summary (II)TTCS Power Budget Issues Summary (II)

• TTCS power budget should be reconfigured. Suggestion:– Accumulator heater size should be reconfigured, (18W instead of

12.5W), in a price of a little less stable accumulator control;

– Or heat leak should be readjusted from the accumulator to the loop;

– A preheater is sized to 5W ;

– An anti-frozen heater of 40W is added, preferentially to the coldest point of the condenser.

• Tracker hybrid power budget shared by TTCS in some extreme cases is proposed.– Considering Tracker hybrids may fail, less than 144W from the Tracker

together with the present TTCS power budget is then not enough to avoid CO2 freezing.

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Next Actions for thermal simulationNext Actions for thermal simulation

• Providing a draft description of the model

before the Feb. 15th for model checking.

• Checking of fluid part. (Feb 15th)

• Checking of reducing the radiator. (Feb. 20th)

• Checking of post processing (Feb. 30th)

• Simulation for secondary loop (March 30th)

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TTCS Test BedTTCS Test Bed

• Loop is built up, waiting for main components

– Pump, Accumulator, Condenser, HX

• Leak test showed that less than 0.3 bar drop

for 24 hours at the pressure of 50 bars.

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An optical approach is under development An optical approach is under development for CO2 contact angle measurementfor CO2 contact angle measurement

CCD camera

Protection wall

Measurement of contact angle of CO2 on stainless steel surface.doc

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TTCB Structure AnalysisTTCB Structure Analysis

FEA meets safety requirement.TTCB_Structure Analysis_SYSU_I-deasV11_result_Jan2006.doc

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Tracker Thermal Control System TTCS Progress at Sun Yat-sen University Feb. 1, 2006, CERN Geneva...

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