Stay cool
Current in, heat out
What comes in a current, must then go out as heat, according to a rule of thumb. Different factors must therefore be taken into account when planning the air conditioning for the computer centre: in addition to room size, current draw, redundancy and thermodynamics, the energy efficiency plays a growing role. The DMRZ relies on a cold-water pump circuit system (5,000-litre reservoir in the cellar) as well as forced cooling with Stulz Cyber-Air precision air-condition systems. In the cold months external air is fed in for cooling. As the external temperature sinks, the load for the compressors in the air-conditioning systems also sinks. Intelligent standby management reduces this load even further. It distributes the stored reserve capacities equally to all systems which then run in the partial load range and thus very economically. Further savings potentials are provided by the fans in the CyberAir air-conditioning systems. Just like their big “colleagues” on the roof, they are also powered by electronically controlled EC direct current motors and deliver precisely the air flow that is used. Not less, but also no more. They adapt without variation to all power requirements and run very efficiently in the partial load range.
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