Some Approach on CPU Cooling

1
Some Approach on CPU Cooling
By Yizhong Wang
2
Outline

• Motivation
• Microfluidic Heat Sink
• Nanofluid
• Summary

3
Motivation
4
Motivation
Intel Dual Core Xeon
Model Clock Speed Power SpeedPower ratio MHz/W
5140 2.33 GHz 65 W
5150 2.66 GHz 65 W 41.0
5160 3.00 GHz 80 W 37.5
7120M 3.00 GHz 95 W 31.6
7130M 3.20 GHz 150 W
7140M 3.40 GHz 150 W
7150N 3.50 GHz 150 W 23.3

5
Motivation
Passive Heat Sink Cooler (Fin) Fan -gt Forced
Convection

6
Motivation
Water Cooling in Industry Water Intake for
Nuclear Power Plant Cooling

7
Microfluidic Heat Sink
Air Water
Specific Heat Capacity J/(g.K) 1.012 4.1813
Density g/L 1.2 1000
Thermal Conductivity W/(m.K) 0.025 0.6

8
Microfluidic Heat Sink

9
Microfluidic Heat Sink

10
Microfluidic Heat Sink
Channel L27mm, W100um, Spacing40um H50um,
64 Channels

11
Microfluidic Heat Sink
Average Speed 1.537 m/s 1.662 m/s 1.791 m/s 1.923 m/s 2.057 m/s 2.194 m/s 2.333 m/s 2.474 m/s 2.617 m/s
Flow Rate cm3/s 0.4917 0.5319 0.5732 0.6153 0.6588 0.7021 0.7466 0.7918 0.8374
Pressure Change 100K Pa 100K Pa 100K Pa 100K Pa 100K Pa 100K Pa 100K Pa 100K Pa 100K Pa
Re 204 238 277 319 365 416 470 529 591
Heat Transfer Q (W) 61 78 96 116 137 161 187 215 245
Outlet Temperature 55 60 65 70 75 80 85 90 95
12
Microfluidic Heat Sink
13
Nanofluid
14
Nanofluid
15
Nanofluid
16
Nanofluid
17
Nanofluid
18
Discussion and Summary

• Air Cooling reaching it limit
• Water (liquid) cooling will be the next
  generation
• Nanofluid have great potential in cooling
• Particle Deposition
• Evaporation and Refill