44. . Heat recovery operation principleHeat recovery operation principle
The heat recovery system ensures continuous replacement of used air with fresh, clean air. Heat recovery takes place in the
exchanger, where the supplied air receives part of heat and humidity from extracted air (mainly from kitchen, bathroom etc.).
Therefore fresh air which continuously flows into the interior (living room, children’s rooms, guest bedroom, office etc.) is
thermally optimized. The fresh air is also filtered before it is supplied. To prevent dust buildup on fan blades the extracted air is
filtered as well. The two air streams are separated so that fresh and used air do not mix.
An automatic bypass enabling after-cooling during summer months (in the night mode) is integrated in the heat recovery unit. As
heat recovery is not desirable during summer the bypass channel directs extracted air outside of the exchanger and thus
prevents cooler night air from being heated up by the warm extracted air.
Figure 2 – Heat recovery principle
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