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DATA CENTRES
systems, for example, recover 60-70% of the bleed water, which can then be re-used as make-up water, while also collecting rain. Saving water also saves money - if 65% of the hr recycling system (the type that we use), up to £120,000 can be saved each year; an impressive payback on the £70,000 installation costs. There are also hybrid systems, which combine dry and evaporative cooling, often chosen for larger data centres. Although increases the risk of Legionella. Apart from water saving concerns, extra care should also be taken when it comes to water hygiene – water softening, for example, will help prevent scale.
Closed-loop evaporation Evaporative cooling can also be delivered through closed circuit systems. Unlike a cooling tower, where process water is used as the energy transfer medium and is open to the atmosphere, the coil inside a closed-
cascading over the tubes of the coil extracts heat from the process loop (via evaporation), with air forced across the coils to increase the transfer of heat. to dry coolers, blowdown of the basin water is reduced on a closed-loop system so water conservation is also improved.
time condition monitoring. Live readings of parameters that can be indicative of corrosive conditions (such as oxygen, pH, pressure, temperature and inhibitor levels) are taken every 15 minutes, alerting responsible parties to small changes before they become big problems. risk of expensive repairs and breakdown, monitoring in this way will also contribute to water conservation, by identifying leaks and – one of the most water wasting processes in a HVAC systems operation. After routine maintenance, for example, historically, a sample would have been taken
to check the inevitable disruption in system this disruption would be recognised, but if conditions returned to safe levels quickly, as is often the case in a well-managed system, no further action would be required. The results of the sample taken at a single point in time would no doubt cause concern and lead to
Best-practice for the future Modern data centres are being designed with the changing climate in mind, able to more easily cope with extreme temperatures at either end of the scale. Evaporative cooling systems – whether cooling towers, hybrid or so water recycling, reuse and where possible, condition monitoring, are key to ensuring unnecessary wastage.
Group company, a leading provider of water treatment solutions for commercial applications, including data centres.
www.gwtltd.com
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