Energy optimisation
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Energy Optimisation. Wayne Salter HEPiX Spring Meeting in Bologna. Energy Optimisation. Why should we worry about it? Environment – to be ‘Green’ Feel good factor Image of lab… Reduce costs Extend the capacities of existing infrastructure

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Energy Optimisation

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Energy optimisation

Energy Optimisation

Wayne Salter

HEPiX Spring Meeting in Bologna


Energy optimisation1

Energy Optimisation

  • Why should we worry about it?

    • Environment – to be ‘Green’

      • Feel good factor

      • Image of lab…

    • Reduce costs

    • Extend the capacities of existing infrastructure

      • More computing power with same electrical/cooling infrastructure…

HEPiX Spring Meeting 2013 @ Bologna - 2


Pue or not

PUE or not?

  • Lot being made of energy saving in industry with push to be ‘Green’ whatever that should mean and emphasis on the PUE as a measurement

    • PUE perhaps not the best measure

      • What is it? Lots of different interpretations

      • How should it be measured? Annual measurement not instantaneous

      • Does not take into account efficiency improvements at the server level

      • Does not take into account potential reuse of heat

  • However, there are many areas which can be addressed and they don’t all impact the PUE

HEPiX Spring Meeting 2013 @ Bologna - 3


Potential approaches i

Potential approaches - I

  • Computer hardware

    • Newer equipment

    • Better disks

    • Processors

    • Higher efficiency PSUs

    • Custom hardware (removing all unneeded components) e.g. Open Compute Initiative

  • Cooling infrastructure

    • Free cooling (low temperature ambient air, evaporating water, or a large thermal reservoir)

    • Variable speed motors

    • Dynamic matching of cooling to actual needs

HEPiX Spring Meeting 2013 @ Bologna - 4


Potential approaches ii

Potential approaches - II

  • Electrical infrastructure

    • More modern equipment

    • UPS and generators? Only use if really necessary …

    • High voltage to as close to the servers as possible

    • Reduce number of conversion steps

  • Computer room optimization

    • Hot/cold aisles (good separation of hot and cold air flows)

    • Use of blanking plates

    • Improve cold air distribution and remove leaks (use of CFD can identify not only hot spots but also over cooled areas). Just enough cold air and uniform – depending on whether layout is homogeneous or not

    • AHUs vs. CRAC vs. in-line vs. water-cooled racks (active and passive)

    • DC distribution

    • Higher inlet temperature (gain more from free cooling)

      • Downside – less time to react if cooling is lost

HEPiX Spring Meeting 2013 @ Bologna - 5


Potential approaches iii

Potential approaches - III

  • Operations

    • Powering down

    • Capping and load profiling

  • Recuperation and re-use of heat

    • For heating offices or other

    • However, temperature is usually too low and needs to be raised

HEPiX Spring Meeting 2013 @ Bologna - 6


More extreme

More extreme

  • Changing location

    • Better free cooling options

      • Weather and/or environment (rivers/lakes/fjords)

    • Lower electrical costs

      • Not really energy saving directly (indirect)

    • Renewable energies

      • Still not zero environmental impact

HEPiX Spring Meeting 2013 @ Bologna - 7


How to proceed

How to Proceed?

  • Dedicated track on measures adopted at the different sites?

  • Working group to share experience and advice on what measures could be taken by specific sites?


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