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Optimising energy consumption


by Jon Martinez – controls project manager at Airedale. T 34


here are a few ways of optimising energy consumption in a data centre; one of which is to optimise the set points of your operating equipment.


For example, you can dynamically optimise the chilled water set point.


Rather than having it too low, at Airedale we have a calculation where we can optimise the chilled water operating set point to match what the system requires. This is opposed to, for example, fixing it at seven degrees and then for 90% of the year that being too cold and for the other remaining 10% of the year it being too warm. In addition, you are not exactly matching what the system requirements are.


So by monitoring everything and tying it all together, you can optimise that set point and save yourself a whole lot of energy, especially if you can raise the set point as high as possible and get as much free-cooling out of the system as possible.


For example, if you are operating your system at 17 degrees chilled water set point as opposed to the traditional 7-12 degrees operating set points, you will get more free-cooling for a higher percentage of the year.


Another way to optimise energy consumption in a data


centre would be to retrofit Electronically Commutated (EC) Fans to your air movement equipment. EC Fans are an easy win for energy saving. You can retrofit an EC fan and instantly save energy just by running the fans at the same speed and airflow.


However, you can then further complement that by incorporating a more intelligent controls strategy that ramps the fans up and down, based on temperature or demand, because the curve on the EC fans are more of an exponential type curve. So the lower down you are with your fan speed, the more energy savings you will make.


Another way to save energy is by installing a Building Management System (BMS) which will pick up a lot of information from the system. It automates a lot of the processes so you are not relying on manual adjustments all the time.


It also logs and records a lot of the end usage data, which allows the user to effectively target areas where energy is being wasted. If you have got a spike in energy at 2 o’clock in the morning and you have got a monitoring system in place that looks at the variables around it, you could target such areas and take action to reduce energy consumption accordingly.


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