Adiabatic cooling

Adiabatic cooling (evaporative cooling) is a building block for ecologically and economically leading technology in air handling unit construction. Our HANSA Blue Line ASB+ is realized with a double cross-flow plate heat exchanger. The cooling of the outside air is up to more than 12K. Thus, the recommended temperature difference between outdoor and indoor temperature of 6K can be realized as a rule.


When cooling is required, the plate heat exchanger is sprayed with highly atomized water on the exhaust air side, and the exhaust air is cooled by adiabatic humidification of the air. This cooled exhaust air flows through the exchanger, thus transferring the cooling capacity from the exhaust air side of the plate heat exchanger to the outdoor / supply air flow. Due to the principle of indirect adiabatic cooling described above, the absolute humidity in the supply air is not increased.

The achievable cooling capacity is essentially a function of the outside and exhaust air temperature and the exhaust air humidity. Of course, the efficiency of the selected heat exchanger also plays a role. With our ASB+ system, spraying only one side of the double plate exchanger can achieve over 12K temperature reduction of the outside air temperature. And this with a simple design, low water consumption, with a robust system and without having to accept further pressure losses.

Advantages of the HANSA ASB system

  • The HANSA ASB system is rigidly mounted and therefore maintenance-free
  • The spray bar is arranged plane-parallel to the heat exchanger so that uniform wetting and thus evaporation takes place across the inlet cross-section
  • There is an optimized distribution of the water with low consumption
  • No circulating water, therefore no microbial growth
  • No additional pressure loss
  • We offer an "all-in-one" solution with independent, cost-effective control and cleaning equipment