We have an enthalpy exchanger and clearly felt the difference over the holidays we spent with relatives (also a new building with controlled residential ventilation).
Thank you. However, the enthalpy exchanger also seems to be controversial!?
because enthalpy exchangers pose a problem. "The process of moisture recovery cannot be regulated. If a lot of moisture is produced in the house, it could become too humid," says Schnieders. In this case, for example, mold formation threatens if the moisture condenses on thermal bridges. Countermeasures can only be taken by drastically increasing air exchange or ventilating through the windows.
Schnieders recommends ventilation systems with moisture recovery only for large residential buildings with low occupancy. They could also make sense if the supply air is heated. In principle, you have to look closely: how many people occupy the building, how much moisture is produced. "It often turns out that moisture recovery is not necessary. Usually, it is sufficient to slightly reduce the air volume flow to keep the humidity in the living area within an appropriate range," says the passive house expert. He also points out that devices with moisture recovery have about a ten percent lower heat recovery rate. [\Quote]
Also annoying when there is a risk of bringing the mold risk back into the house through such an enthalpy exchanger, which was actually eliminated by the ventilation system.
I am not clear why the construction method affects the necessity of an enthalpy heat exchanger?
because the different construction methods handle moisture in the room differently afterwards!? Brick probably absorbs moisture more and releases it again after a while, in contrast to a timber frame construction with membranes in the wall, or even the interior plaster can definitely influence the moisture in the room (keyword moisture-regulating clay plaster)
It does not become too humid with the enthalpy exchanger. Otherwise, it would have to increase the humidity from 30% to 70% or more. There is not that much moisture present.
One should not expect double the percentage all at once from this. For us, it is about 10-15% more. But these are the crucial ones so that it does not become unpleasant.