Rotorsystems are used for recover the heat energy contained in the exhaust air of ventilation systems. The supply air is fed through one half of the continuously rotating rotor, while the exhaust air is fed in counter-flow through the other half of the rotor. The flow channels are divided with supply air and exhaust air flowing in opposite directions, whereby the warmer air flow gives off energy to the rotating heat storing mass.
In the other half of the rotor the cooler air flow meets the warm heat storing mass. Due to the temperature difference a heat transfer takes place from the heat storing mass to the air flow. The cold supply air is steadily warmed as it flows through the heat storing mass. In the other half of the rotor there is a constant heat dissipation by the exhaust air flow to the heat storing mass. Energy savings of up to 90 % are possible.
In the example shown above the supply air is heated from - 15 °C to + 15 °C by the recovery of the heat energy contained in the exhaust air. By this functional principle rotorsystems are also suited for cooling during the summer. For cooling during the summer the process is reversed.