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FEATURE DATA CENTRE MANANGEMENT


ECO MODE: IMPROVED EFFICIENCY, BUT HIGHER RISK By using this design approach, the PowerWAVE 9500DPA UPS, a racking solution with 500kVA capacity, achieves 96 per cent efficiency in normal operating mode. However, this UPS, like many others from various manufacturers, also offers an option for further energy efficiency, that is it can be operated in Eco mode to achieve efficiencies of 99 per cent or better. Eco mode in dual conversion online UPS systems is similar to the default operating mode in offline types, as shown in Figure 2. During normal operation, the critical load is powered from the bypass line; it is therefore subjected to the raw mains supply and all the transients, brownouts and other disturbances it may bring. Although some spike suppression and RF filtering may be provided, protection is not as effective as having the UPSs power conversion components in line between the raw mains and the critical load; no correction is applied to frequency, voltage or waveform variations. Another issue is that, if the mains


supply does fail, there will be a supply break during transfer to and from the inverter, although this is brief and typically of 2–10ms duration. Overall, for most data centres, cleanliness and


transformerless UPSs’ efficiency drops significantly at loads below 25 per cent. Known as Xtra VFI, this smart technique exploits the modular topology of UPSs like the PowerWAVE 9500DPA. When enabled, it automatically adjusts the number of active modules to meet changing load requirements. By being continuously and dynamically resized in this way, the UPS’s capacity can be kept more fully-loaded, and therefore optimally efficient in operation. Modules that are not needed are


Figure. 2


continuity of supply take the highest priority, so the Eco mode is used with caution if at all.


IMPROVING EFFICIENCY AT LOW LOADS There is a further method available for saving energy. It addresses the fact that


Figure. 3


switched to standby but remain in a state of readiness, primed to start up and transfer to active mode if the load increases. This mode of operation is particularly effective in mitigating the transformerless UPS’s above-mentioned loss of efficiency when loads drop below 25 per cent of the UPS’s full capacity. Another benefit is that Xtra VFI involves rotating the modules between active and standby, therefore extending the service life of the UPS. Fig.3 shows how the Xtra VFI operating


mode can enhance efficiency when running at a low load level for a PowerWAVE 9500DPA modular UPS system, with 10UPS modules (100kW) and total available capacity of 1MW.


Uninterruptible Power Supplies www.upspower.co.uk


CLOUDCOOLER: PLUG & PLAY SOLUTION FOR FRESH AIR COOLING T


he use of electricity in the IT sector has both financial and environmental


significance. Many data centres consume as much electricity in their cooling systems as in their servers. This has both cost and power availability implications. EcoCooling direct evaporative cooling and ventilation solutions can reduce cooling costs by up to 90 per cent when compared to traditional refrigeration. The new CloudCooler Range builds on EcoCooling’s 15 years’ experience to achieve unparalleled cooling efficiency. The plug & play modular cooling units are designed for rapid deployment and are widely considered to be one of the lowest ‘total cost of ownership'


EcoCooling


mixes air to deliver cooling at a setpoint temperature and an inbuilt humidification loop to achieve compliant conditions. With over 1,000 installations worldwide


solutions on the market. Operators have the option to combine ventilation (free cooling), evaporative (adiabatic) cooling and humidification to provide a simple cooling solution that is easy to install, maintain and operate. The CloudCooler unit automatically


www.cloudcooler.co.uk www.ecocooling.co.uk


including for BT, Hydro66, CGG, Cambridge University, 4D, Cap Gemini, EcoCooling’s cooling technology is said to be leading the way in maintaining cloud and colocation datacentres, as well as serving the emergence of crypto mining farms. The CloudCooler range is an all-in-one


solution for data centre cooling. Rapid deployment, plug & play set up, simplicity and low ‘total cost of ownership’; future proofing you and the environment.


T: 01284 810586


10 JUNE 2018 | ELECTRICAL ENGINEERING


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