Air conditioning and computer centre power efficiency the reality
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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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Air conditioning and computer centre power efficiency the reality

Air ConditioningandComputer Centre Power EfficiencyThe Reality

Christophe MartelTony Cass


Data centre cooling options

Data Centre Cooling Options

  • Outside Air

  • Cooled Air

    • Central distribution

    • Local distribution

    • Very local distribution

  • Direct Water Cooling


Basic housekeeping is essential

Basic Housekeeping is essential!

Nice background for a ballerina...

A muchbetter

design.

... and a nice way to preheat the inlet airfor the servers behind!


Basic housekeeping is essential1

Basic Housekeeping is essential!

Mind the gaps!


Basic housekeeping is essential2

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.


High density starts at 6kw rack

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


Reducing air speed

Reducing air speed

Cold aisle closed

False floor. False ceiling for return air.

Cold aisle closed. Hot aisle open.


Reducing air speed1

Reducing air speed

Wall side or peripheral air distribution

No false floor. False ceiling for return air.

Cold aisle open. Hot aisle closed.


How do you make cold air

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.


How do you make cold water

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


Optimising chilled water generation

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…


Annual electricity consumption

AnnualElectricityConsumption

Efficient Data Centre — PUE=1.3


Take time for chiller selection

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%)


Air conditioning and computer centre power efficiency the reality

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]


Conclusion

Conclusion

  • Optimise...

  • ... everywhere!


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