The Marilyn green datacenter
Datacenters consume a lot of energy. Over and above computer servers, whose consumption can be optimised, the generation of heat caused by servers is significant. Current IT centres consume energy to produce cooling in order to limit room temperature.
The PUE (power usage effectiveness) ratio is used to determine the productivity of datacenters. The PUE is defined as: the global consumption of the site / consumption of IT equipment over 1 year of operation. Several actions are undertaken by market actors in order to reduce the PUE. In the Marilyn project, an innovative and efficient approach is proposed to provide solutions.
Marilyn is the first high-density environmentally friendly datacenter in France and an emblematic site of the Cité Descartes, the sustainable development centre of Grand Paris.
Optimised electrical consumption
In the average site in France today, the PUE is 2.5, according to recent studies. New projects today target ratios of 1.8, or even 1.6. A recent study undertaken in the USA demonstrates disparities in this ratio of between 1.34 and 3 for functioning datacentres.
The target electricity consumption set for the Marilyn datacenter is a target PUE (productivity) of 1.3. Therefore, the Marilyn concept is aiming for a very high energy output.
Several technological choices exist to reduce electricity consumption:
- Innovative “all air” architectural design to cool a high-density datacentre without producing chilled water
- Use of ambient air (“free-cooling”) 80% of the year
- Recycling heat generated by the machines used to heat offices
- Invoicing electricity consumption of each source for each client
Environmentally friendly choices on all levels
To reduce the datacentre’s overall carbon footprint, alternative solutions have been put in place:
- Refusal to use (lead) batteries for flywheel inverters
- Refusal to use copper for a fibre optic cabling on 100% of the site
- Implementing recycling of materials