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Air Conditioning and Computer Centre Power Efficiency The Reality

Air Conditioning and Computer Centre Power Efficiency The Reality. Christophe Martel Tony Cass. Data Centre Cooling Options. Outside Air Cooled Air Central distribution Local distribution Very local distribution Direct Water Cooling. Basic Housekeeping is essential!.

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Air Conditioning and Computer Centre Power Efficiency The Reality

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  1. Air ConditioningandComputer Centre Power EfficiencyThe Reality Christophe MartelTony Cass

  2. Data Centre Cooling Options • Outside Air • Cooled Air • Central distribution • Local distribution • Very local distribution • Direct Water Cooling

  3. Basic Housekeeping is essential! Nice background for a ballerina... A muchbetter design. ... and a nice way to preheat the inlet airfor the servers behind!

  4. Basic Housekeeping is essential! Mind the gaps!

  5. Basic Housekeeping is essential! Hot is cool! Nb of hours / year Classical free cooling Extra Free cooling COOLING OutdoorTemperature [°C] Indoor conditions from 20°C to 27°C But not too hot: Vendors now accept that their systems will run at higher temperatures, but there are reports that server energy efficiency starts to drop above a certain temperature.

  6. High densitystartsat6KW/rack Typical rack Typical room 30% of the area for racks Basic data Standard air velocity: max 0.25 m/s Temperature in/out IT : 8°C Area equivalence: 1 rack front side = 3.33 floortiles 0 < low density < 2kW/m2 < high density Central air cooling < 2kW/m2 < Local air cooling

  7. Reducing air speed Cold aisle closed False floor. False ceiling for return air. Cold aisle closed. Hot aisle open.

  8. Reducing air speed Wall side or peripheral air distribution No false floor. False ceiling for return air. Cold aisle open. Hot aisle closed.

  9. How do you make cold air? • Via heat exchange with something else which rejects heat to the environment • something else is usually water • Heat wheel is one alternative • But closer in spirit to complete fresh air cooling: supplemental cold air generation will be required if peak temperatures approach the desired set point for machine room temperature.

  10. How do you make cold water? COOLING PRODUCTION COOLING DISTRIBUTION Pipes Pumps Air handling units Air cooled chillers Horizontal / vertical Screw or Compressor type dry coolers Pipes Pumps Water cooled chillers Water cooled rack Towers In row cooling Absorption type

  11. OptimisingChilled Water Generation • Fans, pipes: size optimisation -> pressure drop of the system • Fan/pumpmotors: • Preferably variable speed drive (30%); if not then Eff1 class(10%) • High efficiencyexchangers • Filterselection and period maintenance • Regulation optimisation via significantindicators • And, mostimportantly, the chillers…

  12. AnnualElectricityConsumption Efficient Data Centre — PUE=1.3

  13. Take time for chiller selection • Eurovent Certification certifies the performance ratings of air-conditioning and refrigeration products according to European and international standards. Energy efficiency Ratio (EER)Ratio of the cooling capacity to the power input of the unit. European Seasonal Energy efficiency Ratio (ESEER)ESEER = A.EER100% + B.EER75% + C.EER50% + D.EER25% • Recent Chiller Optimisations • Free cooling option for air cooled chiller • Oversizing with variable speed drives (EER up to 10!) • Adiabatic coolers • Smartcools systems • EER between 3.16 to 3.63 (delta 15%) • ESEER between 3.86 to 4.31 (delta 20%)

  14. Chiller size selection Data centers are easy to design compare to other buildings! Typical building Data Centre Cooling power installed +15% Cooling Power [kW] Chiller 3 Cooling power installed +30% Chiller 2 Classical Cooling Power demand Chiller 1 Time [Days]

  15. Conclusion • Optimise... • ... everywhere!

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