Indirect Adiabatic and Evaporative Data Centre Cooling

Developed in response to the broadening of the

ASHRAE recommended server inlet temperature

envelope in 2008, Excool represents the most

advanced technology of its kind.

Unique in its approach Excool is able to cool data

centres with year round full or partial free cooling.

Mechanical cooling is only required to top-up the

partial cooling element only when the outdoor

temperature is excessively high.

The successful initial application of the technology

and first of its kind in the UK in 2011 has been

followed by installations by leading global DC

providers and end users.

The system uses outdoor air to indirectly

cool the indoor air supply removing the data

centre heat via a specially designed PVC heat

exchanger. Heat transfer is achieved with-

out the outdoor air entering the building.

Therefore outdoor hazards such as fire, air

pollution and salt aerosol are kept out of the

building.

Excool ServicesOur range of services include:

■ Maintenance

■ Remote Monitoring

■ Recording and evaluation

of consumption values

■ Device optimisation

■ Own test laboratory for factory

acceptance tests and product

development

Hot return air from data hall

Cool outdoor air

Excool have optimised air to air heat exchanger technology

specifically for the application of adiabatic and evaporative

cooling in data centres.

Excool’s unique heat exchanger is manufactured from a

composite material which unlike the more commonly used

aluminium, makes it resistant to corrosion, more robust and

leak tight.

The Excool adiabatic and evaporative cooling system has been

developed specifically for the product and is highly efficient

both in terms of its ability to saturate the outdoor air fully and

in its water use. Supply air temperature is controlled by a

modulating outdoor air volume, water use and, when required,

mechanical cooling.

How it works

Winter OperationAir returning from the data hall is drawn through

the heat exchanger by ECDC plug fans. Cool

outdoor air is drawn through a second air path in

the heat exchanger by additional ECDC plug fans.

Summer OperationMoisture is added to the hot outdoor air which

has the effect of lowering the air temperature

temperature. A typical UK peak summer day

may have a dry bulb of 35∞C with a wet bulb

temperature of 21∞C. By fully saturating the air the

dry bulb temperature can be reduced to 21∞C. This

reduced temperature air is then used as a cooling

medium to remove the heat from the data centre.

Optional DX ModuleIn more challenging environments it may be

necessary to ‘top-up’ the cooling capacity with

a partial DX supplementary cooling section.

This is an integrated module and is designed to

supplement the heat exchangers. It is sized as a

small percentage of the overall cooling load.

Data Centre

Heat ExchangerAdiabatic

Ambient air

Datercentre Return and Supply air

Compressor

Heat ExchangerAdiabatic

Ambient air

Datercentre Return and Supply air

Data Centre

Heat ExchangerAmbient air

Datercentre Return and Supply air

Data Centre

Reduced Electrical InfrastructureThe reduction in the dependency on mechanical

cooling has a major impact on the size and cost of

the electrical infrastructure. When considering

the lower capacity requirement of the electrical to

mechanical power loads, the plant, equipment and

machinery power infrastructure is reduced.

■ Diesel generator

■ Diesel storage

■ Transformer

■ Electrical distribution

■ Switchgear etc

Based on 1MW IT load, N+1 resilience and ASHRAE Recommended temperature envelope.

Cooling Only PUETypical cooling only pPUE for a 1MW data hall in

London based on 24∞C supply, 36∞C return, 75%

average annualised demand and N+1 resilience

would be 1.04.

This is calculated by analysing the systems energy

requirements for every one of 8670 hours of

temperature data for the typical reference year

for London Heathrow published by ASHRAE. It

assumes the average load throughout the year is at

75% and that all units including the standby unit are

operational.

Water TreatmentThe system is complete with on board water

treatment. A clean potable water supply is

required for normal operation and maintenance

intervals. The units have an automatic drain down

and purge cycle to ensure all areas of potential

bacterial growth are removed. The system also

employs cartridge based biological filters and scale

inhibiting system.

Total Input Power (kW)500

375

250

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Compact and LightweightThe technologically advanced design and use of

high grade materials results in an industry leading

unit size and weight. Typical footprint and weight

per kW of cooling output are;

■ 28kW per m2 footprint

■ <3.5kn/m2 per unit without water storage

■ <7.5kn/m2 typically including integrated

water storage tank.

The Excool product uses high quality components

and materials to ensure long term reliability and

resistance to corrosion. The product is provided

with a lifetime warranty against corrosion.

Stainless steel framework and support structures

are used throughout the unit. Outer panels are a

composite of PVC and aluminium.

The air movement is achieved using high efficiency

ECDC fan and motor assemblies and the system

pumps use robust stainless steel internal

components for long life.

■ Main base frame – Stainless steel

■ Outer panel framework – Aluminium pentapost

■ Main external panels – painted aluminium outer

skin with composite inner skin

■ Internal panels – Stainless steel

■ Heat exchanger outer frame – Stainless Steel

■ Heat exchanger support frame – Stainless steel

■ Drip tray – stainless steel

■ Heat Exchanger – Composite material medium

to remove the heat from the data centre.

High Quality Construction – Lifetime anti Corrosion Warranty

24 hr water Store

Typically 800mm High

On Board Bacterial Control

Water flows through tank

Typical less than 7.5kn/m2 combined load

Integrated Water Storage

Witness Testing and Validation

Excool has committed significant

financial resource to enable clients to

see the product operating in simulate

environmental conditions.

Equipment manufactured for specific

projects can be fully witness tested

under full heat and temperature loads

at site based ambient conditions

to validate thermal and acoustic

performance.

The test facility is located

at the company’s UK

headquarters in the West

Midlands.

2009 Test Lab I opened Working prototype

2010 On-going R & D Breakthrough in HEAT EXCHANGER technology

2012 Excool installed on 6MW data centre in The Netherlands

2013 New test Lab II opened Excool awarded contracts for on-going 46MW data centres

2014 Excool installed in data centres totalling in excess of 100MW plus installations in Norway and Sweden BRILL award from the Uptime Institute using Excool’s cooling technology New 600KW 400m² customer demo test facility opened

2014 Profile Park achieves Tier III Certification using Excool technology, the only compressor free indirect adiabatic cooled data centre in the World to achieve this

2015 Excool installed in Docklands 5.4MW multi-storey/ 7 floor building

2015 First installation in Germany

2015 Excool GmbH wins at the ECO Internet Awards 2015 under the Data Centre / Hosting / Housing category

2016 Excool expands its market into South America

2016 Excool win ‘Cooling Entrepreneurial Company of the year award’ by Frost & Sullivan

2014 LONDON2 achieves Tier III Design Certification of Design Documents using Excool technology

October 2014 Creation of Excool GmbH

November 2014 Launch of Excool Space

2011 Excool installed on 9MW data centre

Contact us

Excool Ltd Cooper House, Corbett Business Park, Shaw Lane, Stoke Prior, Bromsgrove, Worcestershire B60 4EAt +44 (0) 1527 492750 e info@excool.com w www.excool.com