Danfoss The innovative key to efficiency in mega datacenter Application guide

Case story | Danfoss Turbocor Compressors

The innovative key
to efficiency

in mega datacenter

Barclays Project Dart.

50%

reduction in energy
consumption and
CO2 emissions.

A Danfoss partner recently carried out a “mega” data centre
cooling project on behalf of Barclays for its award-winning
Project Dart.

The innovative cooling solution harnesses the outstanding
energysaving capabilities of 12 Turbomiser chillers, with an
ice-making system providing cooling back-up and exceptional
resiliency, plus Liquid Pressure. Amplication (LPA) delivers free
cooling for high energy eciency.

The key project details are:

• A 30,000 m² “mega” data centre

• Requiring 16.8 MW of cooling

• Main objectives: ultra-resilient, to ensure security and continuity
of operation, and low Power Usage Eectiveness (PUE)

Key issues and challenges

There was a desire to move away from traditional free cooling,
due to its reliance on glycol as a secondary cooling medium,
with all the issues of additional expense and control this brings
up. Secondly, noise was a critical consideration, since the site
was close to a residential area, with bedrooms as close as 50m.
Therefore, the solution had to minimise noise and vibration
intrusion to the surroundings.

turbocor.danfoss.com

The key design requirements were:

• 19°C return / 13°C chilled water

• 40°C air on ice making

Solution

The solution involves the use of 12 x 1.4 MW chillers on an N +2
arrangement. The design included integral primary pumping
through the chillers to a low-loss header arrangement, with valves
in the low-loss header to create a two-chiller ice-making loop. A
secondary pumped circuit served the data halls, via buer vessels
and the ice tanks as necessary.

Innovation

• The system is equipped with a Low Pressure Amplication (LPA)
system that delivers high-ambient eciency and low-ambient
refrigerant based free-cooling

• It uses “hybrid mode” LPA and condensing control strategies to
ensure optimum eciency all year round

• Series evaporators and inverter-driven duty and standby pumps
for maximum eciency, with four refrigerant circuits and integral
bypasses for resilience

• Integrated acoustic pack for ease of maintenance, longevity
and eciency

• Integral dual electrical supplies and controls UPS

Danfoss

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All trademarks in this material are proper

Carbon reduction: comparative usage and savings

Using the standard DEFRA conversion factors for company reporting of equivalent tonnes
of CO2, Turbomiser with LPA and hybrid control will save over 554 tonnes per year of CO2
compared to a standard chiller solution.

Compared to a traditional free-cooling chiller solution, the Turbomiser with LPA and
hybrid control will save 194 tonnes of CO2.

Summary of benets

• Energy and carbon – a near 50% reduction in energy and carbon dioxide

• Running costs – at 9p / kWH, Turbomiser would save over £91,000 per year compared
to a standard chiller, and over £32,000 compared to a traditional free-cooling machine

• Reliability – one moving part, no vibration and no oil management components to
go wrong

• Reduced servicing – see Reliability above

• Noise – no vibration means low noise; high rpm means easy attenuation of any noise
that is made; no screw compressor “whine” at part load

• Compactness – lightweight chillers means lightweight structures

• Exceptional resilience

Project Dart
Exceptional energy eciency and
outstanding resilience.

Danfoss Turbocor® Compressor

The compressor has just one moving
part, operates without vibration and
has no oil management components
to go wrong.

Total annual equivalent CO2 [kg]

1,400,000

1,200,000

1,000,000

800,000

600,000

400,000

200,000

701,975 kg

0

Turbomiser chiller

with LPA

896,080 kg

Typical

free-cooling chiller

Turbocor Compressors Inc · 1769 E. Paul Dirac Drive · Tallahassee, FL 32310 · USA

[e-mail] · turbocor.danfoss.com · Phone [phone]

oss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice.

his also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specications already agreed.

ty of the respective companies. Danfoss and the Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.

FRCC.PB.044.A1.02_Sept. 2014 © Copyright Danfoss Commercial Compressors

1,256,307 kg

Typical

standard chiller