DOCUMENT & DATA MANAGEMENT
building automation, security technology and power supply solutions to meet the growing requirements for availability, protection and energy efficiencies.
FAILURE IS NOT
AN OPTION Redundancy, high system availability, security and energy efficiency are key elements for Citigroup. Processed data is stored in duplicate within the data centre and mirrored to other Citigroup data centres. In the building itself, a dual power feed, duplicate downstream medium and low voltage switchboards with duplicate switches, busbars and dual cooling technology ensure maximum redundancy.
If a power failure
were to occur, two independent uninterruptible power supply units and the emergency power supply would take over, ensuring continued power for at least 72 hours.
This means that the FDC meets the Tier IV standard awarded by the Uptime Institute for maximum redundancy and 99.995% availability.
PROTECTING YOUR ASSETS To guarantee the safety and security
of the building, assets and processed data, all the installed Siemens security and safety systems were aligned with Citigroup’s global safety and security requirements, as well as the facility for regular emergency evacuation and safety drills.
The building automation, security, fire safety and power supply solutions include: a Desigo™ building automation system; 1,600 Sinteso™ fire detectors; early fire detection via smoke extraction systems; fence sensors and cameras for the 1,300m perimeter fence; 150 internal and external CCTV cameras; an intrusion detection system with 168 door sensors; 150 Sivacon low- voltage switchboards; 104 NXAIR medium-voltage switchboards and 96 Sentron transfer control devices. Approximately 2.3km of busbars and 22km of medium-voltage cable were laid for the power supply.
The building was awarded Leadership in Energy and Environmental Design
www.tomorrowsfm.com “COLD AISLE
CONTAINMENT ALLOWS THE AIR COOLING THE
SERVERS THROUGH THE RAISED FLOOR TO BE DIRECTED IN A MORE TARGETED WAY.”
Other measures at the FDC include cold aisle containment, which allows the cold air cooling the servers through the raised floor to be directed in a more targeted way, thus reducing the air volume. In addition, the warm exhaust air from the server rooms, which has a heat of approximately 30°C, can be utilised for local heating through the use of heat pumps.
“Our motivation was to continuously save energy,” explained Norbert Heberer of Cofely Deutschland GmbH, the data centre’s operator. “Building automation allows us to individually control and continuously monitor the heating, ventilation and cooling technology that is so vital to us.”
“Citigroup has had success with free cooling, relying on cool outside air and the Desigo building automation system adjusts the cooling performance to meet the actual demand. In addition Citigroup has lowered the pressure of the cool air
(LEED) Platinum certification just one year after it opened, making it one of the most energy efficient data centres in the world. The Desigo building automation system from Siemens plays a central role in maintaining high energy efficiency and the standards of the LEED certification.
TURNING THE DATA
CENTRE GREEN Increasing energy efficiency of data centres is a top priority for the industry. The IT infrastructure of a data centre requires a great deal of energy, however, utilising intelligent lighting and cooling control can considerably lower energy consumption.
that exits from the raised floor and cools the server racks by 10 Pa.”
The FDC is designed for thirty years of operation. The systems are flexible and continue to grow along with the data centre’s requirements. The planned power capacity of the FDC was 5MW.
In
its current configuration, the data centre uses 5,000m² of its 10,000m² for server operations.
At the beginning of operations, the data centre used 900kW of electricity. Additional utilisation and occupancy has increased the electricity requirement to exceed 1MW. “One challenge was to continually adjust the power supply and cooling capacity to the demand, from the planned 5MW of total capacity to the actual starting load of 900 kW and then to the current level of about 1.5MW” comments Heberer.
“When operations started, we had a less efficient ration of consumed energy to server energy demand, giving us a Power Usage Effectiveness, PUE, of 2.8.” He adds.
Technicians analysed the complete electrical supply to adjust the power supply and cooling capacity. Siemens then worked in collaboration with the technicians to optimise the cooling control. “Now all the dependencies of free cooling, pumps and chillers operate together as a bundle and can be controlled as demand dictates,” explains Heberer. To adjust energy efficiency based on demand and lower the PUE value, lighting has been tied to access control so that lights turn on only when server rooms are occupied. In addition, air conditioning in the server rooms has been set to the optimal operating point so now less cooling capacity is needed. Air pressure in the cold aisle has also been lowered by 10Pa.
As a result of working closely with Siemens, the current PUE of the FDC is 1.5. Citigroup and Siemens continue to work in collaboration to exploit energy savings and further reduce the PUE.
www.buildingtechnologies.siemens.com TOMORROW’S FM | 35
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