EcoCooling CLOUDCOOLERS - internal Direct Evaporative and Free Cooling solutions for data centres

The use of electricity in the IT sector has both financial and environmental significance. Many data centres consume as much electricity in their cooling systems as in their servers. This has both cost and power availability implications. It is believed the IT sector has a bigger carbon footprint than air travel and consumes over 5% of the developed world’s electricity. Many operators want to reduce their impact on the environment by consuming less energy and the new CloudCooler range is a simple, efficient alternative to refrigeration.

An EcoCooling direct evapoative cooling system can reduce your IT or data centre cooling costs by up to 90%, comply with ASHRAE 9.9 and produce a PUE (Power Usage Effectiveness) of under 1.1.

How systems operate in Data Centres

In very cold climates such as the Nordics and Arctic circle, where ambient temperatures never exceed 25C, fresh air can be used all year round to cool a data centre. This is called free cooling and CloudCooling ECV range is designed specifically to exploit these climates to achieve world-class levels of efficiency without the need for supplementary cooling.  However, in warmer conditions, or when IT equipment requires cooler inlet temperatures,  free cooling alone cannot meet the required internal conditions, supplementary cooling is required on the hotter days. ECT CloudCoolers incorporate direct evaporative cooling into the unit as an energy efficient and reliable alternative to refrigeration for data centre cooling.

The CREC® control system dynamically controls airflow, hot air recirculation and evaporative cooling based on the ambient conditions, systems can be controlled using both humidity and temperature parameters. These modes maximise the Coolers’ efficiency and performance and are tuned during the commissioning process for individual facilities:

  • Ventilation: Energy efficient fans move fresh air through the area being cooled and transport heat away.

  • Attemperation/Recirculation: During colder weather, the CREC® control system automatically mixes hot recirculated air with cold external air to supply air at a predefined set-point temperature.

  • Evaporative Cooling: During hot weather, air is moved over a wetted CELdek® cooling pad. The air temperature is reduced as the water evaporates. Temperature compliance can be achieved with no need for mechanical refrigeration.

In ECV CloudCooler systems there are no evaporative cooling media, therefore, there are two different types of operation, ventilation and attemperation.


Example layout out ECT 10800 CloudCoolers - Colocation facility with filter wall

Example layout out ECT 10800 CloudCoolers - Colocation facility with filter wall


When fresh air is used in a data centre there can be a risk of either particulate or gaseous contamination.  The quality of the air in the locality of the data centre can affect the feasibility of the use of fresh air. It is now normal to fit filtration to a minimum of EU4/G4 standards. EcoCooling would usually advise dual filtration for IT installations.  Air intake filtration (pre-filter jackets) is designed to eliminate potential contamination from external air. In addition cartridge filters can be used in either ducting or as replacement ceiling tiles to filter the recirculated air.

EC Fans – Efficient Airflow through your Data Centre

Electronically commutated (EC) fans are driven by a micro-controller instead of a traditional AC motor. The technology provides the following advantages:

  • Increased speed control: EC technology enables continuous adjustment of the fan speed to meet the cooling demands of the data centre. EcoCooling control systems are designed to take advantage of the energy savings which can be gained by reducing fan speeds.

  • Low power usage at partial loads: The effect of fan speed on power drain is governed by a cubed relationship, meaning that at approximately half the speed the fan will be using an eighth of the electricity. Operating the EcoCooling system at half speed reduces the fan energy use by over 85%.

Colocation facility equipped with modular ECT 108000 CloudCooler

Colocation facility equipped with modular ECT 108000 CloudCooler

Free Cooling

Free cooling is an economical method of using low external air temperatures to reduce the amount of additional cooling required. When the ambient external temperature is below the desired supply set point the CREC® system will run in ventilation and attemperation mode. On warmer days of the year, evaporative cooling is used to cool the supply air. EcoCooling CREC® control systems and CloudCoolers (direct evaporative cooling) can exploit the full free cooling envelope.

The number of exploitable free cooling days is dependent on your location and desired supply temperature;

  • Cooler climates provide more free cooling potential.

  • Higher supply temperatures increase the available number of free cooling days.

Cooling in the Nordics and The Arctic Circle

Colder locations, such as the Nordics (see Hydro66 case study), where there are conditions for free cooling and an abundance of low-carbon hydropower, are becoming more popular for data centre operators and builders. The key advantages are low-cost cooling, power, practically unlimited renewable generation capacity and grid infrastructure to support large data centres. The CloudCooler Nordic Grade range has been specifically developed by in-house engineers to accommodate Nordic data centre requirements including the very low temperatures which can result in low humidity environments.

ASHRAE – Achieving Compliance

The internationally accepted environmental standards for running data centres are contained in the ASHRAE TC 9.9 guidelines.  Temperature, humidity and contamination levels are all identified as important factors when designing a fresh air or evaporative cooling system for a server room or data centre. EcoCooling CREC control solutions optimise the cooling efficiency and provide ASHRAE acceptable conditions for the majority of the time. Visit the ASHRAE website here.

EcoCooling – Innovators in cooling efficiency

EcoCooling is credited with revolutionising the control systems required to use direct evaporative cooling in IT environments. The R&D department drives to incorporate the latest energy efficient technologies into all product ranges, ensuring our clients have some of the most innovative ventilation and cooling systems in the world. This focus on innovation has also resulted in EcoCooling holding a number of patents for fresh air technologies.  For more information on controls options see here.

The benefits of using an EcoCooling CloudCooler system

  • Experienced innovators in fresh air solutions and controls

  • Free solution consultancy and design assistance

  • Modular systems can reduce capital cost

  • Advanced control systems

  • Patented products and controls

  • Internal and external product ranges

  • UK manufacturers – Critical spares all ex-stock

  • Worldwide remote commissioning service

  • Qualify for Salix funding

Not sure about your requirements?  Our team of application engineers can provide analysis for your location to advise on the right equipment for your supply temperature requirements.  Contact us at