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Energy Optimisation

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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  1. Energy Optimisation Wayne Salter HEPiX Spring Meeting in Bologna

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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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