Award winning Excool units made possible by state of the art test facility

Exool Ltd provides low energy cooling solutions to the data centre market utilising energy efficient Adiabatic and Evaporative cooling of the outdoor air to cool the indoor air indirectly via plate heat exchangers.

We have designed, developed and improved this technology in a purpose built test centre in our West Midlands Headquarters.

Data centres are required for nearly all of the operations we take for granted in modern life across the world; such as surfing the worldwide web, communications, banking and continues to be one of the fastest growth sectors in the construction industry.  The move to cloud computing is accelerating that growth even further.  Cooling represents almost half of the energy consumed in legacy data centres and the need to improve this situation is a pressing one.

Our 400m² test facility allows clients, consultants and data centre operators to witness performance tests of the Excool units in real life conditions (as detailed below) with airflow parameters of upto 100,000m³/h.

The latest technology, such as fully variable heat loads, temperature and humidity sensing equipment, large capacity data logger/taker, energy & water usage monitoring systems are utilised.

This allows Excool units to be thoroughly tested in real life conditions across the world such as external ambient conditions ranging from 0°C upto +50°C dry bulb & +30°C wet bulb; Internal heat loads of upto 600kw simulating a working data centre.

All the sensing & monitoring equipment are of the highest specification; with sensing equipment being Class A & ASHRAE approved, providing real time feedback of accuracy to 100th of a degree. This equipment is periodically test & calibrated to ensure the results are true and accurate.

After 5 years of testings Excool can confidently quote low pPUE’s of 1.025 in many locations across the world. ‘pPUE = (Cooling input power + IT power ) ÷ IT power’.

Heat Exchange

The Excool cooling system has the most effective, efficient and lowest energy process currently available to cool data centres.

In the colder winter months, the system relies on sensible heat exchange typically above 70% overall efficiency, however as the ambient temperature increases to typically 20?C water is introduced into the process increasing overall efficiency in excess of 90%.

The first stage of water introduction follows an adiabatic path along the wet bulb line on a psychometric chart using a closely controlled atomising technique enabling relative humidity approaching 100% to be achieved.

The second stage utilises a highly effective evaporative technique.  The heat exchanger plates are “charged” with water on the ambient side to achieve heat exchange in an effective 2mm spacing between the heat exchange surfaces.  The water is held onto the heat exchange surface during this charging process and the cooling effect transfers from air to air to an effective air to water process.  To evaporate water requires a relative exceptionally high energy source which in this application is provided by the air returning from the data centre. 

Overall, relatively small amounts of water evaporation provides an exceptional cooling effect all harnessed within the Excool heat exchanger, which is manufactured from a composite material, which unlike the more commonly used aluminium, makes it resistant to corrosion, more robust and leak tight and able to be ”charged” with water.

Using Evaporative & Adiabatic cooled outdoor air as a cooling medium without introducing this into the data hall eliminates the dependency on mechanical cooling in thousands of global locations. 

In more extreme environments there is a significant reduction in mechanical cooling relative to traditional systems.

The reduction in compressor dependency leads to further capital expenditure savings in the electrical and BMS infrastructure costs. 

Major savings in the costs of generators, transformers, switchgear, diesel storage, BMS and other associated items can be realised.  Alternatively the ‘stranded’ power normally reserved for the cooling system can be released for additional IT.  In most cases this can add 25% to the IT power available.

Excool excel on location for large datacentre projects

After 2 years of research and development, Excool have provided equipment for several multi MW data centres.

What our customers are saying:

“Excool scored highest in our market evaluation of low energy cooling technologies for our new Data Centre. Cooling our data centre in a safe way without using compressors would have been unthinkable a few years ago. This technology helps to set ITB-Datacenter apart and gives us a unique advantage in the market.” - Niels Hensen (Owner), ITB-Kwadraat

“For a large part of the year that [air cooling] process is sufficient.  At certain times of the year when it gets warmer, we spray additional water onto the face of the heating system.  There is a lot less complexity – it is a very simple cooling process.  It also means significantly reduced energy consumption” – Gary Boyd, Rackspace’s Senior Director of Data Centre Project Engineering

“The Excool indirect adiabatic cooling solution represents a very exciting evolution in data centre low energy cooling technology.  The system, whilst novel in its means of integration, comprises tried and tested system building blocks extant across a broad range of cooling technologies” – Robert Bath – Director Engineering


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