How to supply a high-performance computer centre with CO2-neutral cooling energyFirst biomethan-refrigeration supply for companies belonging to the e-Plus group, Düsseldorf
The energy centre provides both cooling energy and – in the case of power failure – electricity with an N+1 redundancy. To cool the computer centre (cooling load approximately 2.5 MWth), there is always cooling energy available by means of free cooling, ultra-modern turbo-compressors or an absorption refrigerator with more than 6 MWth of overall performance. To power the absorption refrigerator, two large, biomethane-powered combined heat and power units that are capable of isolated operation are required for the turbo-compressors. The combined heat and power units are also needed for other important electricity consumers in the energy centre. A capacity of more than twice the required amount is available for both the supply and return of cooling energy. The specific cooling capacity is about 1,620 W/m².
High-security computer centre in accordance with TIER III/IV
The computer centre of the E-Plus Group is subject to the highest quality and availability requirements according to TIER III/IV. Having double supply channels for the production, distribution and utilisation of the cooling capacity as well as the highest standard possible (TIER IV) enables maintenance during operation and a guaranteed annual availability of 99.995%. Should the public utilities’ electricity network fail, complete N+1 redundancy is also available: two independent diesel-powered UPS systems supply the computer centre, while the energy centre can maintain refrigeration by drawing on the energy of at least one of the two biomethane combined heat and power units.
Security thanks to energy supply contracting
Despite the high availability requirements, the early integration of eCG as a contractor for E-Plus has not resulted in a need for any additional personnel or large investments. The long-term energy costs are easy to plan. Thanks to special incentive and premium-based arrangements in the contract, it is assured that the power station will be operated in a secure manner and that resources will be used consciously. Fault and error messages run simultaneously and redundantly to an automated control system and are accumulated directly in eCG, thereby enabling extremely quick reaction times.
CO2-neutral, highly efficient operation
The energy concept which has been realised shows foresight with regard to the possibilities of “Green IT”: on the one hand, combined heat and power units cover the complete electricity, heat and cooling requirements of the power station, while on the other, CO2-neutral biomethane is used as input energy for the combined heat and power units. The highly efficient combined heat and power enables more than 83% of the primary energy to be used. The latest turbo-compressors and a sophisticated optimisation system use the electrical energy that is available with a high degree of efficiency.
Self-produced biomethane provides planning security
Using renewable raw materials, an eCG-owned biogas plant in Giesen is producing biogas which is then dried, desulphurised and refined to biomethane in a processing plant. By feeding the biomethane into the public gas network, it can be extracted throughout the country and efficiently used – as is the case with E-Plus and its combined heat and power units. Were there to be an unanticipated expansion of the computer centre, long-term contracts with farmers and the high system capacity would provide ample planning security for the supply of renewable energy.
enercity Contracting GmbH (eCG)
Customer E-Plus Mobilfunk GmbH & Co.KG
Project Manager, Sales Representative (eCG)
Phone: +49 (0)511 430-1844
Fax: +49 (0) 511 941430-1844
Head of Data Center