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.

turbocor.danfoss.com

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. Amplification (LPA) delivers free cooling for high energy efficiency.

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 Effectiveness (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.

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 buffer vessels and the ice tanks as necessary.

Innovation

•The system is equipped with a Low Pressure Amplification (LPA) system that delivers high-ambient efficiency and low-ambient refrigerant based free-cooling

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

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

•Integrated acoustic pack for ease of maintenance, longevity and efficiency

•Integral dual electrical supplies and controls UPS

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 benefits

•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

Total annual equivalent CO2 [kg]

1,400,000

1,200,000								1,256,307 kg
1,000,000
800,000						896,080 kg
600,000				701,975 kg
400,000
200,000
0
				Turbomiser chiller		Typical		Typical
				with LPA		free-cooling chiller		standard chiller

Project Dart

Exceptional energy efficiency 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.

Danfoss Turbocor Compressors Inc · 1769 E. Paul Dirac Drive · Tallahassee, FL 32310 · USA [e-mail] · turbocor.danfoss.com · Phone [phone]

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FRCC.PB.044.A1.02_Sept. 2014

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