FACILITIES power + cooling
#dcsukarticle
http://dcsuk.info/n/afkh
Efficient cooling is critical to energy management in UK data centres The UK data centre market is estimated to consume around 6.4 GW1
annually – roughly enough energy to power 6 million homes. Industry figures suggest that the next 12 months will see a 25% growth in investment within this sector2
.
of power
. While this contributes towards strong positive growth in the sector, hand-in-hand with this we will also see increased power consumption – with some industry figures suggesting this may be in excess of 25%3
I
f you consider the current power consumption in context with industry figures that show many data centres have a PUE of 2.0 or higher, it suggests a large proportion of this energy may be wasted due to inefficiencies. When you set this current state of play against the anticipated increase in power demand that 2012 is set to bring, it becomes clear the data centres need to take immediate steps to help reduce their PUE (power usage effectiveness) ratings and optimise the way in which they use power. But why should you turn to EC when looking at retrofit options?
EC efficiency “A primary consideration is that EC fans are inherently more efficient than AC. The core reason for this is the way in which they work. EC technology uses permanent magnets in the rotor hub combined with
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www.dcsuk.info I May 2012
on-board circuitry that precisely manages the commutation and only draws the requisite amount of power – as a result of the reduced losses within the motor they are up to 95% efficient. In contrast, AC motors need to induce a current in the rotor conductors to generate a secondary magnetic field in order to create rotation. This process creates losses and therefore leads to innate inefficiencies in the motor which means that they have to draw additional energy to compensate. In addition, these losses must dissipate somehow – creating additional heat, which puts further load on the wider cooling system.”
Holistic approach “Adopting EC technology means that data centre operators can take a more holistic approach to energy and system management. The additional heat created by using AC must be taken into account by
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