Controlled residential ventilation - Yes or No?!

Hello Perlenmann,

nice that you are looking forward to your new system. Of course, I wish that everything works to your satisfaction. I myself do not claim that such a system is useless. I just point out that there are also people who find a ventilation system unpleasant. My physiotherapist, for example. He regularly tells me that he constantly feels a slight draft and therefore only runs the system on the lowest setting. I myself also react extremely sensitively to drafts. Totally unpleasant for me. By the way, I also cannot tolerate an air conditioner in the car. If the thing has been running for half an hour in summer, I afterwards have a severe sinus infection. But in the last discussion, it ultimately concerned whether a building equipped with [WDVS] is more susceptible to mold than a building without [WDVS]. And there I am of the opinion that this can indeed be the case with incorrect ventilation (although I see no difference between an equally well-insulated house without [WDVS]) but on the other hand, mold formation can also possibly be prevented, as a now warmer exterior wall deprives mold of the basis it needs. With wall insulation in combination with new windows, the windows are probably still the coldest point. If the moisture settles somewhere due to missing ventilation, then probably there. But on this topic you find so many different opinions and theses that in the end you become completely unsettled.

Regards

Hello, we have now decided to build a house after all. Somehow the idea of not being so dependent on the oil industry was important, so at the moment we are researching all over the place, my husband has fixated on controlled residential ventilation with heat recovery. In summer, an acquaintance gave me a lecture about it and explained something about overpressure generation and headaches. My husband has now found out that decentralized ventilation causes this.

And is decentralized ventilation actually so much worse than centralized ventilation?

Would this be the answer to this question? However, my logic tells me that both systems somehow have to create some kind of negative pressure. Do I have a logical knot there? Best regards

Hello,

...we have now decided to build a house after all. Somehow the idea was important, not to be so dependent on the oil industry, ...

You can make yourself completely independent of this.

.... In the summer, an acquaintance gave me a lecture on this and explained something about overpressure generation and headaches.

What training does this acquaintance have? He certainly does not seem to be an expert!

.... Would that be the answer to this question?

No!

.... Do I have a logical knot there?

Yes. The most advantageous solution is the last one shown in the picture. This achieves the most effective ventilation. The middle one is an alternative often chosen for cost reasons. In a single-family house still quite acceptable/justifiable. Both can be designed as overpressure, equal pressure or underpressure systems, the latter with exhaust air volume flow surplus. The pressures are a few Pa and are hardly perceptible by the human body. Anyone who claims otherwise is a storyteller! Sensibly, however for other reasons, you should choose an equal pressure system. A knowledgeable consultant who accompanies the construction project and also takes over the planning of the building services (heating, hot water, ventilation) should be able to provide sufficient information here. Without this person, you run the risk of falling for pure sales arguments.
Decentralized ventilation is actually only used when it comes to individual rooms.

Best regards.

Thank you very much!

No, he was not a professional. Neither am I. It was basically just a stream of words about what he himself recorded from his building planner and then also distorted over time in my probably incorrect way of remembering.
At least we now enter a conversation with the construction company more knowledgeably, at least regarding this ventilation system.

I am now further educating myself about passive houses in general...

It is really madness in Germany. On the one hand, the Energy Saving Ordinance aims to save as much energy as possible, but on the other hand, people live in hermetically sealed bunkers and then blow the energy out the window. We decided against a controlled residential ventilation system and instead equipped 4 windows with ventilation functions. I am curious to see how it goes.

Hi,
which ones do you have and how is it working? What is your opinion on it?
Can you also say something about the costs?

Regards
MaHaus

Hello,


Rather rarely....


To avoid water vapor condensation in multi-layer components, the thermal resistance to heat transfer should increase from the inside to the outside (insulation layer outside) and the vapor diffusion resistances should decrease. These conditions are, for example, met in wall constructions such as: interior plaster, sand-lime brick, solid bricks, mineral wool, air layer, facade panel (wall with ventilated facade). If the wall remains damp, which is especially important to consider in new constructions, then water behind a waterproof or water-repellent outer layer, as can be the case with the thermal skin, can barely escape by diffusion and the masonry will be damaged over a long period of time.[1]

[Source 1] Kur, Friedrich; Wohngifte, Handbuch für gesundes Bauen und Einrichtungen

...snip...
Hi,
how do you do that with internal insulation?
We have a half-timbered house that is to be insulated on the inside.

Thanks for information and tips.

Regards
MaHaus