Thermal simulation of the Inner System local supports Rafael Coelho - - PowerPoint PPT Presentation

Thermal simulation of the Inner System local supports

09/04/2019 Rafael Coelho Lopes de Sa

Introduction

• Last time we presented a preliminary study of the thermal

simulation of the Inner System local supports.

• The mesh at the time was done as small as possible, basically

limited by the computer where the simulation was being run.

• A new CAD server with multiple cores was installed at UMass

for this simulation, allowing to further reduce the mesh and greatly reducing the time per simulation in AnSys.

• We improved the mesh to element sizes of 700μm for layer 1

and 400μm for layer 0. This allows for a more detailed meshing of the periphery of the FE chip, for instance.

• The result does change significantly from the last

presentation.

• Maybe even more detailed meshing study is called for.

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248 250 252 254 256 258 260 262 0.5 1 1.5 2 2.5

R0/1-1 ring sensor max temp

mesh element size max delta T (arb conditions)

Reminder

• We are following close this presentation:

– https://indico.cern.ch/event/834964/contributions/3499224/attachments/ 1881668/3114616/ThermalAnalysis_InputFEA_DAF_VR15.pdf

• We will try to provide information following the format suggested in this

presentation.

• We do not do everything that is in that presentation yet, but we chose to use

this simulation to study the design aspects.

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Thermal conductivities

4 Item Material Thermal Conductivity (W/ mK) Notes Tube Titanium 16.4 150μm wall thickness 1.5mm ID for layer 0 2.0mm ID for layer 1 & CR Tube-foam adhesive Loaded epoxy 4 50μm thickness Foam High cond graphite foam 20 Facing Prepreg 600 (in plane), 2.2 (across) 150μm thickness Loading adhesive S4445 1.3 75% coverage, 100μm thickness FE chip, sensor Silicon Temperature dependent

Silicon property and module dimensions

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Modules taken directly from AT2-IP-EP-0009 v4 Layer 0 modules Layer 1 modules

What do we simulate?

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3+2 quad modules (middle quad) 5 3D modules (middle triplet) 3+2 3D module single triplet (can’t test failure modes yet)

In more details

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This has been suppressed Calculated on average with Thome’s model (should be cross checked by differential CoBra simulation)

Average HTC (from Thome’s model)

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Local Support Number of modules/ unit Number of units Power (W) ID (mm) Length (cm) Mass flow (g/s) vap quality HTC (kW/ m2K) Final average vapor quality Coupled Ring R0 3 6 62 2.0000 28 3.15 0.26 11.7 0.34 Coupled Ring R1 4 20 252 2.0000 63 3.15 0.01 14.0 0.26 R0 inter 3 10 104 1.5000 46 1.04 0.01 11.9 0.32 R1 outer 4 20 252 2.0000 63 2.52 0.01 14.0 0.32 L0 stave 3 8 83 1.5000 48 0.83 0.01 10.1 0.32 L1 stave 4 12 152 2.0000 48 1.52 0.01 12.1 0.32

Sensor dissipation

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For the simulation we use V=Vbias and the local T. tsensor can be read from the previous slides

Heat flux

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We add another 0.08 W/cm² for services in layer 1, and 0.1 W/ cm² for services in layer 0.

Results R0/1-1

11 R0/1-1 ring Scenarios Bending radius 1 2 3 4e 4i 5e 5i 9.5 263.26 263.27 271.67 273.91 276.22 282.48 285.36 10 255.37 259.95 266.54 270.33 269.32 277.24 276.28 10.5 258.14 262.55 269.02 273.24 270.77 280.07 277.08 11 261.69 265.99 272.45 285.9 281.66 284.26 280.66 minimum 10.3 10.1 10.2 10.0 10.2 10.0 10.2 256.0 260.6 267.2 269.9 267.2 269.9 268.8 DT 17.8 22.5 29.0 31.7 29.0 31.7 30.6

Graphs

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250 255 260 265 270 275 280 285 290 9.4 9.6 9.8 10 10.2 10.4 10.6 10.8 11 11.2

Scenarios

1 2 3 4e 4i 5e 5i

• Poly. (1)
• Poly. (2)
• Poly. (3)
• Poly. (4e)
• Poly. (4i)
• Poly. (5e)
• Poly. (5i)

Tube bending radius Max sensor temperature

Results R0/1-0

13 R0/1-0 ring Scenarios Bending radius 1 2 4 247.69 251.04 4.5 245.42 248.4 5 250.24 250.26 minimum 4.41 4.54 245.3 248.4 DT 7.2 10.2

Graphs

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245 246 247 248 249 250 251 252 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5

Scenario

1 2

• Poly. (1)
• Poly. (2)

Max sensor temperature Tube bending radius

Results L0

15 L0 stave Scenarios 1 2 3 4 5 1.32 248.46 252.65 258.48 262.71 267.72 1.06 246.93 250.64 255.81 259.81 264.38 0.8 248.34 249.23 253.66 257.39 261.46 0.54 250.53 249.02 252.79 256.31 259.89 0.28 254.31 252.19 255.16 259.02 262.43 minimum 1.04 0.76 0.65 0.64 0.59 247.4 249.1 253.3 256.9 260.7 DT 9.2 10.9 15.1 18.8 22.5

Distance from the edge with periphery to tube center (currently 0.8cm)

Graphs

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245 250 255 260 265 270 0.2 0.4 0.6 0.8 1 1.2 1.4

Scenarios

1 2 3 4 5

• Poly. (1)
• Poly. (2)
• Poly. (3)
• Poly. (4)
• Poly. (5)

Position of the tube wrt to edge with periphery Max sensor temperature

Still to do

• Understand mesh features, specially for rings
• Study failure cases for R0/1-0
• Study L1 and R0inter.
• Study current densities on sensors from temperature gradient
• Study runway using this simulation

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The End