Outside the UK
Wilo CronoLine-IL pumps
Google has set the long-term goal of using only renewable energies to meet the energy requirement for its data centres and is making great efforts to increase the energy efficiency in its data centres, especially for the energy-intensive cooling of the servers.
Google chose Hamina, Finland, for its newest data centre. The decisive factor was not the electricity price, but the low average temperature of 2°C and the location’s proximity to the Finnish sea. The server cooling is done using cold seawater, saving energy in the process.
Wilo CronoLine-IL pumps play a crucial role in making a main node on the global data highway economically and eco-friendly.
22% of energy consumption in data centres is attributed to the cooling. Water cooling through use of natural resources, as in Hamina, is therefore a vital strategy for improving efficiency. In addition, efficiency criteria are also set high for the pumps used to convey cooling water in the data centre, as can be seen from the Wilo pumps “CronoLine-IL” used there.
The CronoLine-IL glanded pumps are installed horizontally as in-line pumps in the piping systems. The pipe sizes of the cooling circuits range from DN 150 to DN 200. The impellers of the pumps have been designed to suit this and they have a nominal diameter of 320 or 270mm. The specific impeller geometry and a flow-optimised coating play a part in the high overall efficiency. The hydraulic efficiency of the CronoLine-IL with connection nominal diameter DN 150 is over 80%, and the hydraulic efficiency of that with DN 200 is more than 70%. The motor efficiency is at 94%. As a result, a motor nominal power of between 30 and 37kW is sufficient to pump the volumes required for meeting the cooling loads. Additional energy savings are achieved by the consumption-based pump speed control through a frequency converter.
The housing and impeller of the CronoLine-IL series of pumps used in the Google data centre are made of wear-resistant cast iron with flake or spheroidal graphite. To further reduce the pumps’ life cycle costs, the pump lantern is made using a patented design. The design ensures specific removal of the relatively large amounts of condensate formed on the pump housing when a pump is conveying a cold medium at high ambient temperatures. This protects the pumps from typical corrosion damage. In addition, highly wear-resistant mechanical seals made of graphite, silicon carbide, EPDM and stainless steel allow for long maintenance intervals.