DEERNS BRINGS CONCEPTS TO LIFE

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Deerns Green Datacenters

A leading financial services provider relied on Deerns to design its twin datacenters. The development is characterized by the combination of a TIER III+ requirement, power density of 3,500 W/m2 (325 W/sqf) and a strong focus on energy efficiency and sustainability. Deerns successfully integrated these, leading to a 22 MVA datacenter that Gartner reviewed as “best in class” and “does not identify substantial improvement opportunities”.

Given the requirements, the design process was a constant search for synergy, or at least balancing, between greening the datacenter and top-end datacenter performance. The most significant energy consumption measures incorporated in the design are:• highly efficient hot and cold aisle separation• application of cold/heat storage to enlarge the use of

free cooling• collection of rainwater and re-use for the datacenter

cooling towers• governing of the datacenter by “lights out” principle, which

will reduce energy consumption of lighting and other ancillary systems

• re-using of heat from datacenter for heating of office complex• green roof to minimize solar gain through roof.

Figure 1: Storing the over capacity of free cooling during winter or nights, significantly increases the use of free cooling and so reduces the energy consumption of the datacenter

The result is astonishing: The datacenter has a PUE of 1.26, with 2.0 being the existing average and 1.5 being the current best practice as used by the industry in the Netherlands. This generates a huge saving on operational expenditures with the reduction in energy costs alone accounting yearly for approximately 5,000,000 Euro. The additional investments hence pay for themselves in less then a year.

Next Generation Green DatacenterWith a PUE as low as 1.26, the conventional cooling concept has been stretched to its limit in terms of energy efficiency. Thus, the next step is to rethink the cooling needs of a datacenter and how to best satisfy those needs. With this goal in mind, Deerns’ datacenter specialists have developed the GC-DC© concept (Green Cooling for DataCenters), an innovative and intelligent new combination of existing, proven technologies. It is, however, a different and especially much more efficient way of ‘getting the heat outside’.

Due to the much more direct transfer of the heat developed in the computer racks to the outdoor air, free cooling can be used for a much greater part of the year. When the outdoor temperature becomes too high (greater than ca. 21°C / 70°F 1), the system is aided by a compression cooling unit located outside the computer room. The overall system is built in modular compart-ments, ‘cooling cells’, which are totally independent of one another, so full cooling system failures are no longer possible and no water-bearing systems for cooling are located in the computer room: better availability and reliability through simplicity. Because of the modular nature of the system, investment costs for the entire cooling infrastructure can be postponed in line with the growth of energy demand during the operational phase: pay-as-you-grow.

Deerns Green Datacenters

Deerns designs a breakthrough datacenter with a PUE of 1.26The project combines state of the art technology, innovative concepts and top-end datacenter performance,

and Gartner reviews the datacenter as ‘Best in Class’. However, Deerns has already designed the next generation

datacenter with a PUE of 1.15, or less.

1 Assuming a cold aisle temperature of 25 °C / 77 °F

Table 1: Financial information on the GC-DC© concept

In summary, the GC-DC© concept features:• a PUE of 1.15 and 100% free cooling up to 21°C / 70°F 1;• improved reliability and availability, no possibilities for total

cooling system failure;• a completely modular cooling system, for improved

phasing of the investment;• a simpler system with easier maintenance and

operation.

Thus, a company that operates a green datacenter based on the GC-DC© concept has a major competitive advantage due to lower operational expenditures, even without taking into consideration the

Deerns Green Datacenters

Conclusion

In recent years, a reduction of about 60% of cooling energy consumption has been achieved by Deerns through tuning the system design with respect to energy consumption and by incorporating add-on features as an aquifer for increased energy efficiency. Today, a reduction of 80% of cooling energy consumption is possible with the Deerns’ GC-DC© concept. For tomorrow, Deerns is already developing the next step…

associated benefits from a social and environmental perspective. The improved phasing of the investment is a valuable asset, especially given the present uncertainties with project finance and sales projections. Basically, GC-DC© makes a “greener datacenter” the best value proposition for any datacenter host.

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Deerns has developed datacenters for: - Universities - Financial enterprises- Telecom enterprises- Hospitals

Deerns Green Datacenters

PUE 1.5

PUE 1.26

Tuning Green through Total Cost of Ownership:1 System for Free Cooling / Minimal Energy Consumption

2 Components for Minimal Energy Consumption

Improve Greenness through ‘Add-ons’:1 Using Cyclic Nature of Outside Air Temperatures

2 Aquifer Storage or Surface Water

Perfectly Green Cooling for Datacenters:1 Direct Free Air-to-Air Cooling

2 Innovative Combination of Proven Technologies

3 Full Modular Design

PUE 1.15

Three Steps to Perfectly Green

Deerns consulting engineersFleminglaan 10P.O Box 12112280 CE RijswijkT +31 (0)88 374 00 00F +31 (0)88 374 00 10www.deerns.com

Amsterdam T +31 (0)88 374 02 40Eindhoven T +31 (0)88 374 02 20Groningen T +31 (0)88 374 02 00 Maastricht T +31 (0)88 374 02 10Nijmegen T +31 (0)88 374 02 30

Deerns group bvKeulen T +49 221 57 41 201Berlijn T +49 30 69 81 81 91Barcelona T +34 676 333 424Phoenix (Az) T +1 602 343 18 23Dubai T +971 43 41 80 80

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