Unique features of HYAC hybrid air coolers

Read on and watch the animations below to learn more about the unique design features that set Alfa Laval HYAC hybrid air coolers apart.



Combined wet and dry bulb cooling for minimized water consumption

Alfa Laval HybridCool technology makes it possible to combine a traditional air cooler with a WSAC, allowing operators to choose operating mode depending on ambient temperatures in order to save water. During the cooler months of the year, the system can operate in dry mode to save water, and during the hot months wet operation can be engaged to ensure a low outlet temperature.



By combining the two technologies the overall efficiency of the system is high, system size is small and both power and water consumption are kept to a minimum.

Watch the below animations to learn more.

HYAC Single Zone hybrid air cooler

HYAC Dual Zone hybrid air cooler



Maximum cooling efficiency and lowest possible outlet temperature



WetSurface technology offers several distinct benefits:

  • A WSAC cooling system is compact and has low power consumption thanks to its high cooling efficiency.
  • The process medium output temperature is as low as possible thanks to the single approach to the wet bulb temperature.


Watch the above animation to see how the WetSurface technology works.

Wet surface air coolers vs traditional air-cooled heat exchangers

Unlike traditional air-cooled heat exchangers, the tube bundles in a WSAC are sprayed with water and use evaporative cooling to reject the heat from the process medium. This results in superior cooling and a WSAC is both significantly smaller, has a lower power consumption and lower output temperature than an air cooler.

Since the tube bundles are sprayed directly with cooling water, a WSAC system has a single approach to the wet bulb temperature, meaning the process medium output temperature is as low as possible. A WSAC system is capable of cooling the process medium to a temperature just 2.7°C (5°F) above the surrounding wet bulb temperature.

Wet surface air coolers vs cooling towers

A cooling tower/heat exchanger system, on the other hand, has two approaches to the wet bulb temperature due to the intermediate cooling water loop. This means the process medium output temperature will always be higher and an extra chiller stage is required to achieve the same results as with a WSAC.

The cooling water spray and air travel in the same direction (co-current draft), which creates a uniform water film on the tubes that minimizes corrosion.



Un WSAC peut fonctionner avec de l'eau recyclée de moins bonne qualité comme de l'eau de purge.


Grâce à l'espacement entre les tubes, à la conception des buses et à l'absence de remplissage de la tour de refroidissement, un WSAC peut fonctionner avec de l'eau de moins bonne qualité, par exemple l'eau de purge d'une tour de refroidissement, les eaux usées traitées ou l'eau de mer.

Un WSAC fonctionne avec des cycles de concentration beaucoup plus élevés qu'une tour de refroidissement. Le cycle de concentration habituel d'un WSAC peut aller jusqu'à 6 alors qu'une tour de refroidissement peut atteindre jusqu'à 3 avant que le colmatage de l'échangeur thermique ne pose problème.

La flexibilité des sources d'eau et le cycle de concentration habituel élevé réduisent considérablement la consommation d'eau et les coûts associés, faisant du WSAC un choix idéal pour les régions où l'eau est onéreuse.


Watch the above animation to see how the FlexWater technology works.


Watch this video to learn more about how you can minimize life cycle cost while maximizing cooling performance with FlexWater.