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 ConditioningandComputer Centre Power EfficiencyThe Reality
Christophe MartelTony Cass
Nice background for a ballerina...
... and a nice way to preheat the inlet airfor the servers behind!
Mind the gaps!
Hot is cool!
Nb of hours
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.
30% of the area
Standard air velocity: max 0.25 m/s
Temperature in/out IT : 8°C
1 rack front side = 3.33 floortiles
0 < low density < 2kW/m2 < high density
Central air cooling < 2kW/m2 < Local air cooling
Cold aisle closed
False floor. False ceiling for return air.
Cold aisle closed. Hot aisle open.
Wall side or peripheral air distribution
No false floor. False ceiling for return air.
Cold aisle open. Hot aisle closed.
Air handling units
Air cooled chillers
Horizontal / vertical
Screw or Compressor
Water cooled chillers
Water cooled rack
In row cooling
Efficient Data Centre — PUE=1.3
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%
Chiller size selection
Data centers are easy to design compare to other buildings!