DOUBLE WHEEL CONCEPT

In regions with high air temperature and humidity or buildings with dry cooling systems (chilled beams, chilled ceilings), the supply air needs to be cooled and dehumidified. Traditionally air dehumidification has been done by cooling the air to condense the humidity from the air and reheating it to the requested air temperature.

Compared to traditional systems the Double Wheel Concept is cooling, dehumidifying and reheating the supply air more energy effective.

The Double Wheel Concept comprises the following components and functions:

  1. OM sorption rotor: The OM rotor dehumidifies and cools warm outside air very efficiently.
  2. Cooling coil: Outside air is further dehumidified by the cooling coil until the preferred temperature is reached.
  3. OT Condensation rotor: The condensation rotors warms the air to the required supply air temperature.
  4. At the same time, exhaust air is cooled which means the OM rotor works more efficiently.

The Östberg Double Wheel Concept saves up to 60% of the total cooling capacity, remove the need of reheating and requires lower investment and running costs compared to traditional systems. As rule of thumb, the additional cost of the sensible wheel can be saved in the lower investment compared to traditional system components, coils, chillers, cold and hot water piping installation, pumps, valves, controls and electric power supply costs. Accurate total investment costs analyze of the complete installation will show major savings in initial costs. Both cooling and heating energy savings will be additional profit of the investment.