DCN August 2016 - Page 28

cooling KEEP IT FLOWING To help improve efficiency, data centre owners have turned to computational fluid dynamics (CFD) to model airflow in order to optimise cooling. While the science behind CFD makes it ideal for modelling data centres, it can quickly become outdated as workloads change. To solve this problem, Dave Wolfenden of Heatload explains why models must be verified and use real time data to stay valid. C FD is used in a wide variety of industries to understand fluid flows. Complex algorithms and analysis show how a fluid, in this case air, moves. This has made it important to industries such as aerospace and automotive as they look to improve aerodynamics. Racing teams at major motor races use CFD to see how effective the new parts are on a car in the early practice sessions. While those same parts will have already been modelled and tested in a wind tunnel, the real time race data is used to tune the models. CFD on its own is not enough. It is akin to creating a new aerodynamic part for a motor racing team then bolting it to the car hoping that it will deliver a race winning performance. While it may deliver some benefits they will be severely limited in scope. Worse still they are likely to lead to a range of other decisions that can even degrade the overall performance. Β  Use heat loads to test models One way to improve models is to )₯ΉΡΙ½‘Ս”‘•…Ё±½…‘́₯ΉΡΌΡ‘”‘…Ρ„)‘…±°ΡΌΝ₯΅Υ±…Ρ”Ρ‘”ΡεΑ”½˜έ½Ι­±½…(Θΰ()Ρ‘…Ё₯́•αΑ•Ρ•ΈQ‘₯́‘…Ρ„…Έ‰”)…ΑΡΥΙ•…ΉΡ‘•Έ…ΑΑ±₯•ΡΌΡ‘”)΅½‘•°ΡΌ₯‘•ΉΡ₯™δέ‘•Ι”₯Ё‰•₯ΉΜΡΌ)‘₯ٕɝ”™Ι½΄Ρ‘”…ΑΡΥΙ•‘…Ρ„ΈQΌ)ΝΡ…δέ₯Ρ Ρ‘”Ι…₯Ήœ…Ή…±½δ…‰½Ω”°)Ρ‘₯́₯́ё”•ΕΥ₯Ω…±•ΉΠ½˜ΥΝ₯Ήœ„)έ₯ΉΡΥΉΉ•°ΡΌΡ•ΝЁ…•Ι½‘εΉ…΅₯Œ)½΅Α½Ή•ΉΡ́‰•™½Ι”ΑΥΡΡ₯ΉœΡ‘•΄½Έ„)Ι…”…ΘΈ)Q‘”ΥΝ”½˜‘•…Ё±½…‘́₯́Ή½Ρ‘₯Ήœ)Ή•άΈΈ₯ΉΙ•…Ν₯ΉœΉΥ΅‰•Θ½˜)½΅Α…Ή₯•Μ…±Ι•…‘δΥΝ”Ρ‘•΄ΡΌΡ•ΝΠ)Ρ‘”₯Ή₯Ρ₯…°‘•Ν₯Έ½˜Ρ‘”‘…Ρ„‘…±°Έ)Q‘”ΑΙ½‰±•΄₯́ё…Ёё•δ…Ι”Ή½Π)ΥΉ₯Ω•ΙΝ…±±δΥΝ•Ή½Θ…Ι”Ρ‘•δΙ•Υ±…Ι±δ)ΥΝ•‘ΥΙ₯ΉœΙ•™ΥΙ‰₯Ν‘΅•ΉΠΈQ‘₯́₯Μ)έ‘•Ι”Ν½΅”‘…Ρ„•ΉΡΙ”‘•Ν₯Ή•ΙΜ)…Ι”΅₯ΝΝ₯ΉœΡ‘”Α½₯ΉΠΈ%Ё₯́Ή½Π©ΥΝΠ)…‰½ΥЁё”‘•…Ё±½…‘́م±₯‘…Ρ₯ΉœΡ‘•₯Θ)‘•Ν₯ΉΜ…Ή΅½‘•±Μ°‰ΥЁΑΙ½Ω₯‘₯Ήœ„)‰•Ρѕȁ‰…Ν•±₯Ή”…Ή±₯‰Ι…Ι䁽˜‘•Ν₯ΉΜ)Ρ‘…Ё…ΈΝΑ••ΥΐΡ‘”‘•Ν₯Έ½˜)™ΥΡΥΙ”‘…Ρ„•ΉΡΙ•ΜΈ()!•…Ё…Ή½½±₯Ήœ…Ι”‘₯Ι•Ρ±δ)Ι•±…Ρ•ΡΌέ½Ι­±½…)9Ό΅…Ρѕȁ‘½ά•™™₯₯•ΉΠΡ‘”‘•Ν₯Έ)΅½‘•°…ΑΑ•…Ί…Ή‘½άέ•±°₯Ё‘…Μ)Α•Ι™½Ι΅•ΥΉ‘•ΘΡ•ΝЁ½Ή‘₯Ρ₯½ΉΜ)₯Ё₯́½Ή±δέ‘•ΈΙ•…°έ½Ι­±½…‘́…Ι”)…ΑΑ±₯•Ρ‘…Ё₯Ё…Έ‰”ΡΙΥ±δΩ…±₯‘…Ρ•Έ)Q‘₯́Ι•…ѕ́„Ν₯Ή₯™₯…ΉΠ‘…±±•Ή”()™½Θ‘•Ν₯Ή•ΙΜΈ!…Ι‘έ…Ι”°Ν½™Ρέ…Ι”)…Ήέ½Ι­±½…‘́‘…Ή”½Ω•ΘΡ‘”±₯™”)½˜„‘…Ρ„‘…±°ΈQ‘₯́΅•…ΉΜΡ‘…Ё„)΅½‘•°…Έ‰”½ΥΡ‘…Ρ•‰•™½Ι”…Ήδ)‘…Ι‘έ…Ι”‘…́‰••Έ₯ΉΝΡ…±±•Έ]‘•Έ)‘…Ι‘έ…Ι”‘…Ή•Μ₯Ё₯́Α½ΝΝ₯‰±”ΡΌ)₯΅Α½ΙЁё”Ρ•‘Ή₯…°‘…Ρ„™Ι½΄Ρ‘”)Ω•Ή‘½ΘΡΌΥΑ‘…Ρ”„΅½‘•°…ΉΡ‘₯́έ₯±°)‘•±ΐ₯΅ΑΙ½Ω”Ρ‘”΅½‘•°…ΉΡ‘”έ…δ)Ρ‘”‘…Ρ„•ΉΡΙ”₯́½Ή™₯ΥΙ•ΈQ‘”)‰₯•ΘΑΙ½‰±•΄₯́ͽ™Ρέ…Ι”…ΉΡ‘”)ΥΉ‘•Ι±ε₯Ήœέ½Ι­±½…‘ΜΈ)Έ•α…΅Α±”½˜Ρ‘”ΑΙ½‰±•΄₯Μ)Ρ‘”₯ΉΡΙ½‘ՍΡ₯½Έ½˜Ω₯ΙΡΥ…±₯Ν…Ρ₯½ΈΈ)]½Ι­±½…‘́‘…Ή•™Ι½΄‰•₯Ήœ)½ΉΡ…₯Ή•½ΈΝ•ΙΩ•ΊѼΙΥΉΉ₯Ήœ)…Ήεέ‘•Ι”₯ΈΡ‘”‘…Ρ„•ΉΡΙ”ΈQ‘₯Μ)Ι•…Ρ•Ρ‘”½ΑΑ½ΙΡΥΉ₯ΡδΡΌ΅½Ω”‘₯ )‘•…Ё±½…‘́Ѽ…Ι•…́ݑ•Ι”Ρ‘•Ι”έ…Μ)…‘•ΕΥ…Ρ”½½±₯ΉœΈ 䁅ΥΡ½΅…Ρ₯ΉœΡ‘”)ΑΙ½•Ν́₯Ё΅•…ΉΠΡ‘…Ёݽɭ±½…‘́ݕɔ)ΑΙ₯½Ι₯Ρ₯Ν•™½ΘΙ•Ν½Υɍ•ΜΙ…Ρ‘•ΘΡ‘…Έ)‘•…Ё±½…‰…±…Ή₯ΉœΈ)I•ΡΥΙΉ₯ΉœΡΌΡ‘”΅½Ρ½ΘΙ…₯Ήœ)…Ή…±½δ°Ρ‘₯́₯́ё”•ΕΥ₯Ω…±•ΉΠ)½˜Ρ•ΝΡ₯ΉœΡ‘”…•Ι½‘εΉ…΅₯Œ)½΅Α½Ή•ΉΡ́½ΈΡ‘”…ȁ‘ΥΙ₯Ήœ„)Ρ•ΝЁ͕ΝΝ₯½ΈΈ%Ё‘•±₯Ω•Ί…ΥΙ…Ρ”)‘…Ρ„…́Ѽ‘½άΡ‘”½΅Α½Ή•ΉΡΜ)έ½Ι¬ΥΉ‘•ΘΙ•…°½Ή‘₯Ρ₯½ΉΜέ‘₯ )•Ή…‰±•Μ‘•Ν₯Ή•ΊѼ™ΥΙΡ‘•Θ)₯΅ΑΙ½Ω”Ρ‘•₯ȁ΅½‘•±ΜΈ((