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
bernie schrieb:
We don’t have an enthalpy heat exchanger in our central controlled ventilation system, and currently (at 0°C (32°F) outside temperature) the humidity in the living-dining area is 47%. So I can’t really complain.I can hardly believe that! We have 10 plants ranging from 30cm (12 inches) to 2m (6.5 feet) tall. We cook regularly, and four people live here.Either you don’t have air exchange or you have an energy recovery ventilator (ERV).
B
boxandroof2 Jan 2020 21:11Hygrometers also measure differently.. Don’t rely on just one.
We produce relatively little moisture, I think, and have 45-55% humidity with heat recovery. That’s already too low for me; I’m sensitive to it.
We produce relatively little moisture, I think, and have 45-55% humidity with heat recovery. That’s already too low for me; I’m sensitive to it.
RFR schrieb:
We recently had 19% humidity in the living room...
Apparently, Helios ceiling units cannot be retrofitted... :-( Do you have such a device? There are relevant parts available for purchase online. I wanted to check first if I actually miss the component before deciding to buy a replacement.
bernie schrieb:
We do not have an enthalpy heat exchanger in our central controlled residential ventilation system and currently (at 0°C (32°F) outside temperature) have 47% humidity in the living-dining area. So, I can’t complain.It’s similar for us.
Humidity always between 45 and 60%.
Just central controlled residential ventilation without any additional features.
It is then obvious that the controlled ventilation system is either not turned on or the air exchange rate is set significantly lower than the required 0.5/h. Alternatively, you might actually have an enthalpy exchanger and not be aware of it.
Outside, there are about 5g of water per cubic meter, inside at 50% humidity about 10g. If the system processes around 5000 m³ per day, it would have to evaporate approximately 25 liters of water.
This is very unrealistic.
Outside, there are about 5g of water per cubic meter, inside at 50% humidity about 10g. If the system processes around 5000 m³ per day, it would have to evaporate approximately 25 liters of water.
This is very unrealistic.
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