EcoCooling Direct Evaporative and Free Cooling Data Centre Cooling Solutions

The uEcoCooling energy efficient data centre cooling - direct evaporative/adiabatic cooling modulesse 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.

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 EcoCooling systems operate in Data Centres

In very cold climates such as the Nordics and Arctic circle, where ambient temperatures never exceed 25°C, fresh air can be used all year round to cool a data centre. This is called free cooling and EcoCooling’s 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. EcoCooling uses direct evaporative cooling in their products and systems as an energy efficient and reliable alternative to refrigeration for data centre cooling

Standard external CREC® system: 60kW evaporative cooling module for data centres:

energy efficient data centre cooling

The EcoCooling CREC®  control system operates the EcoCoolers in different modes depending on the ambient conditions, systems can be controlled using both humidity and temperature parameters. These modes maximise the EcoCoolers’ 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.

N.b.  In ECV FreeCooling systems there are no evaporative cooling media, therefore, there are only 2 modes of operation, ventilation and attemperation.


CREC installation with filter walls and EC fansWhen 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.

Efficient EC Fans

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 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%.

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 can 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 EcoCoolers (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

Energy Efficicent cooling data centres - EcoCooling/Hydro66 Sweden

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 and power, and practically unlimited renewable generation capacity and grid infrastructure to support large data centres. EcoCooling’s Nordic 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.

Read the Hydro66 Swedish colocation data centre cooling case study.

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 solutions optimise the cooling efficiency and provide acceptable conditions for the majority of the time. Visit the ASHRAE website here.

Condition ASHRAE EcoCooling
Temperature While ASHRAE has an allowable range from 15-32°C, care should be taken running at high temperatures as server ventilation has been shown to increase its energy use at temperatures over 25°C. Systems can provide supply air temperatures below 25°C all year round in the UK and most of Europe.  Control systems provide close control (+/-1°C) and a large percentage of the year 16°C supply air temperature delivery is achievable.
Humidity The ASHRAE allowable range is between 20-80% relative humidity.  Low humidity can result in electrostatic discharge. High humidity, in combination with certain contaminants, can result in corrosion. CREC control systems can automatically transfer the cooling to 3rd party backup systems if the humidity levels exceed the pre-set parameters.
Contaminants EcoCooling products are based on direct fresh air cooling. It is strongly recommended that all IT cooling systems using direct evaporative cooling be designed with a minimum of G4/EU4 grade filtration at both the supply and recirculation points.
A range of filtration products up to F7/EU7 grade are available.

“It was never intended that the recommended envelope would be the absolute limits of inlet air temperature and humidity for IT equipment.” – ASHRAE 2011 Guidelines

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 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

Product Options:

Internal evaporatve cooler - energy efficient data centre coolingInternal Product Range (ECT): Compact and Flexible Solutions – The ECT range of coolers are designed to be installed internally. Multiple configuration options allow for air to be supplied either directly, through ductwork or raised floors.

  • Single box unit including the control system, supply fan, cooling system and dampers.
  • For complete peace of mind, a sophisticated leak detection and alarm system have been incorporated into all of our internal products.
  • Humidification: ECT units can be fitted with a humidification option to avoid low relative humidity non-compliance.

External WetBox Large - Efficient Data Centre Cooling - 60kW moduleExternal Product Range (ECP): Proven Technology and Results – With over 3000 installations worldwide, the ECP range of coolers can be installed externally or inside a plant room. The standard unit is down-flow, however, top and side discharge configurations are available.

  • Units can be placed externally or in a plant room
  • Modular Units mean expansion is cost-effective
  • Controlled by central touch-screen CREC control system
  • Units can be stacked for larger air flow requirements

ECV2200 FreeCoioler installtion - Data Centre CoolingFreeCooling (ECV): ECV units are designed to be installed internally. They comprise of fresh air free cooling systems with inbuilt filtration, dampers and controls, without the evaporative cooling element.

  • Free Cooling units can be used with backup AC
  • Uses the same CREC controller as standard CREC systems
  • Energy efficient inbuilt EC fans
  • Easy installation and maintenance
  • Bolt on cooling modules available

See the table below for our full range of evaoprative cooling and free cooling products and associated cooling capacities over different ∆T (Temperature gain in the room due to the IT equipment)  = Temperature of Extract Air – Temperature of Supply Air.

EcoCooling IT and Data Centre Cooling Products

EcoCooling presents CloudCooler

Choosing the right internal cooling

EcoCooling have developed modular, plug and play cooling units, designed with rapid deployment commercial strategies in mind, that can provide unparalleled cooling efficiency for data facilities. These units make up the new CloudCooler range. They use direct fresh air cooling which is widely considered the most efficient way to cool a data centre using air.  When the weather is cold outside, ambient air mixed with hot recirculated air is used to cool the data centre.  In hot weather or low humidity environements, evaporative cooling can be used to reduce the ambient temperature tor increase the humidity,

  • Our ECV CloudCooler is a our basic free cooling offering.  The ECV is is simple to install and maintain and has proven popular with mining facilities based in the Nordics, where ambient temperatures are very low and no supplementary cooling is required.  This is also available as a 3 Cooler Group racking system for ASIC cryptocurrency mining.
  • Our ECT CloudCooler contains an evaporative cooling and humidification loop. This has been used by facilities in central Europe and the UK who require supplementary cooling on the warmest days to avoid high supply temperatures.

EcoCooling’s inhouse design team can help you develop an installation scheme based on either GPU servers or ASIC miners in different configurations, depending on the business requirement at that time.  This means that the cooling system does not have to be changed if the client decides to repurpose their servers for different currencies or processing requirements (e.g. rendering/HPC).  For more details please contact us on

Advantages of the CloudCooler range:

  • Low total cost of ownership
  • Plug and play solution
  • Simple installation and maintenance
  • Remote support
  • Natural low energy ventilation based cooling
  • Supports rapid deployment

For more info on our internal data cooling range, visit

CloudCooler ecocooling