ᐅ Central ventilation system – is humidity recovery necessary?
Created on: 30 Dec 2019 16:17
L
ludwig88sta
Hello everyone,
for our planned single-family house with 2 floors and a basement, we have decided on a central ventilation system for all rooms with heat recovery within the thermal envelope. The brand and model are not yet determined.
I have read here on the forum a few times about an additional moisture recovery feature (MRF?), since otherwise the indoor air tends to become too dry (of course, the ventilation system also removes the moisture that naturally occurs in the room, which usually makes the air feel comfortable). I wanted to ask if anyone can confirm these issues and whether this is more common in timber frame houses or also occurs in brick houses?
Did you install additional moisture recovery in your ventilation system? How much extra cost does it involve? I assume there are also additional maintenance costs because it involves another motor and related components.
Best regards
ludwig88sta
for our planned single-family house with 2 floors and a basement, we have decided on a central ventilation system for all rooms with heat recovery within the thermal envelope. The brand and model are not yet determined.
I have read here on the forum a few times about an additional moisture recovery feature (MRF?), since otherwise the indoor air tends to become too dry (of course, the ventilation system also removes the moisture that naturally occurs in the room, which usually makes the air feel comfortable). I wanted to ask if anyone can confirm these issues and whether this is more common in timber frame houses or also occurs in brick houses?
Did you install additional moisture recovery in your ventilation system? How much extra cost does it involve? I assume there are also additional maintenance costs because it involves another motor and related components.
Best regards
ludwig88sta
ludwig88sta schrieb:
because different construction methods handle moisture in the room differently afterward!? Brick tends to absorb moisture and then release it again after some time, unlike timber frame construction with vapor barriers in the walls, and even the interior plaster can influence the moisture levels in the room (keyword: moisture-regulating clay plaster) Let go of the idea that liters of water are stored there. If you consistently produce more moisture inside the house than you can ventilate out and there’s also a troublesome cold bridge somewhere, mold will eventually start to form. With clay plaster, maybe just a couple of days later.
D
Daniel-Sp30 Dec 2019 21:53Especially since modern wall assemblies in timber frame construction often do without vapor barriers. And the material the wall is made of ultimately doesn’t matter if the walls are later painted with water-based paint.
But generally, if using mechanical ventilation with heat recovery, then with an enthalpy exchanger.
But generally, if using mechanical ventilation with heat recovery, then with an enthalpy exchanger.
We have two heat exchangers that are replaced in October and April. Initially, the system (Helios) was purchased with heat exchangers without an FRG; after the first winter, we bought heat exchangers with FRG. On average, we have 50-55% humidity in the house. Solid construction with calcium silicate brick plus ETICS (External Thermal Insulation Composite System)
ludwig88sta schrieb:
Thanks. However, the enthalpy exchanger also seems to be controversial!? Marketing nonsense from someone who doesn’t offer an enthalpy exchanger?
You can calculate how much water needs to be evaporated to get above 70% here; that would require a large commercial kitchen and a greenhouse...
We also have a Helios system with an enthalpy exchanger and achieve 45-50%.
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