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Stick computers in oil

Stick computers in oil. Spring 2009 Engr 45. By, Sergy Pretetsky & Jeff Hitchcock. Why computers need cooling. Greater conductivity at low temperatures Avoid critical failure Overheating= over stressing components. Common Computer cooling. Air cooled heatsinks Water cooling

nicole-cochran
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Stick computers in oil

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  1. Stick computers in oil Spring 2009 Engr 45 By, Sergy Pretetsky & Jeff Hitchcock

  2. Why computers need cooling • Greater conductivity at low temperatures • Avoid critical failure • Overheating= over stressing components

  3. Common Computer cooling • Air cooled heatsinks • Water cooling • Peltier cooling • Phase change cooling • Liquid nitrogen & Dry ice and acetone

  4. Thermal properties(water vs. air) • Volumetric Heat capacity (Jcm-3K-1) • Water - 4.186 • Air - 0.001297 • Thermal conductivity (W/(m·K)) • Water - 0.6 • Air - 0.025 • Heat Transfer Coefficients • Water – 500-10,000 W/(m2K) • Air – 10-100 W/(m2K)

  5. Thermal properties(water vs. oil) • Volumetric Heat capacity (Jcm-3K-1) • Water - 4.186 • Oil - ~2 (FAR more than air) • Thermal conductivity (W/(m·K)) • Water - 0.6 • Oil - .15 (60 times more than air) • Heat Transfer Coefficients • Water – 500-10,000 W/(m2K) • Oil – ?

  6. The complete set up

  7. The Tub

  8. The Oil The Computer submerged

  9. The Overclocking test

  10. Thermal paste test

  11. ResultsLong term test • Processing remained the same • Problems • Plastics • Heat retention in oil

  12. ResultsOverclocking Test • With oil • no additional performance • Old computer • possibly maxed out components • If we had new computer, could have pushed it further

  13. ResultsThermal Paste test • Out of 3 popular thermal pastes • 1 was dissolved away • 2 were unaffected • @ RT • Possibly more degrading at running temps

  14. Conclusion • With an old computer • Didn’t help boost performance • Didn’t cause failure What to do next time • Use a radiator to cool the oil • Keep power supply separate

  15. Sources • http://en.wikipedia.org/wiki/Specific_heat_capacity • http://en.wikipedia.org/wiki/Heat_transfer_coefficient • http://www.medwelljournals.com/fulltext/jeas/2006/495-499.pdf • http://www.mobil.com/USA-English/Lubes/PDS/glxxenpvlmomobil1_truck_suv_5w-30.pdf • http://www.engineeringtoolbox.com/thermal-conductivity-d_429.html

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