Low Speed Ventilation®: where the laws of nature collaborate
  • Availability


    High availability, stable temperatures and stable humidity for the equipment
    More Information
  • Flexible


    Multi-positionable racks and IT hardware
    More Information
  • Comfort


    Robust and simple technique in a comfortable and safe work environment
    More Information


    Up to 20% economy on investment with new developments
    More Information
  • Modular


    On demand expandable cooling facility without primary process disturbance
    More Information
  • Energy


    Extremely low energy consumption in data centers that are completely or in start-up situation
    More Information
  • OPEX


    Up to 30% economy on maintenance costs for present state-of-the art data centers
    More Information

Category: LSV Method


The Low Speed Ventilation® design rules result in:

  • Extremely low energy consumption in Data Centers (PUE 1.07 possible),
  • Significant reduction of the Operational costs (up to 30%),
  • Lower initial investments (up to 10%),
  • Simple, stable and reliable climate control system,
  • Cooling equipment removed from white space,
  • Easier implementation of use of outside air,
  • Exclusion of ‘hot spots’ related to high air speeds,
  • Better working environment in white space.

Read more

Air corridor

The air corridor is the essential part in the Low Speed Ventilation solution. This corridor is situated alongside the data room. The air coolers are located in the corridor as part of the wall separating the corridor from either the data room or the space under the raised floor. In this corridor the air is prepared for entering the data room. Return air is mixed with outside air (if available), moistened ( if necessary), filtered and cooled (if necessary) . The space occupied by this corridor is on average the same as the combined space occupied by all the coolers in a conventional layout.

Alfa Laval Low Speed Ventilation air coolers
In close cooperation with our engineers, Alfa Laval air specialists have developed a dedicated air cooler range for the Low Speed Ventilation concept.
Alfa Laval Low Speed Ventilation air coolers are fully dedicated, heavy duty industrial air coolers that operate with low fan speeds, low air velocities and minimal pressure differences along the air flow trajectory.

The air cooler range is based on a flexible modular construction to fit all duties and Data Center lay-outs.

Optional outside air

The Low Speed Ventilation combines easily with the use of outside air for cooling. The corridor is the feature which lends itself for mixing, moistening and filtering the air and acts as a buffer to prevent any direct influence of outside conditions on the white space. Jazo vents are applied to let the air in and keep most of the pressure fluctuations out. The large cross sectional area used for the Low Speed Ventilation are ideal for filtering. A MERV 16 / F9 Quality is applicable without a significant pressure being necessary. The air resistance over the large filter surface is in the range of 20 – 40 Pa, resulting in low energy consumption and durability.


Low Speed Ventilation® can be provided with cold- as well as with hot containment, although due to the absence of pressure differences it’s more about the prevention of mixing and guiding the air. Leakage is not an issue at all.

Tiny airflow resistance

The pressure difference along the trajectory of the airflow in conventional modern Data Centers can be as high as a 1,000 Pa. In the approach of Low Speed Ventilation® it is possible to achieve a tiny airflow resistance of just 20 – 40 Pa, with the air filters taking the lion share.

Apart from the obvious positive effects on the energy consumption, the small load of the fans extends the expected lifetime of the fans significantly. Moreover, it leads to less noise, less maintenance and related costs and to a more robust performance.

Cooling water temperatures

The low air speed and the related dimensions of the cooling equipment leads to a more effective heat transfer. This results in overall higher working temperatures for the cooling water in the unit, on the cold side as well as on the hot side. This makes the free cooling easier and offer the possibility of either applying less free cooling equipment or expanding the temperature range in which free cooling is still applicable. Alternatively, in case of heat harvesting, the heat generated by the Data Center has more economic value.