ᐅ Ventilation with Mechanical Ventilation Systems

Hello

I can’t quite understand the whole discussion about open windows and controlled mechanical ventilation...
Okay, I don’t have any experience yet – I don’t really know how I will use it in practice – we are only just building *with controlled mechanical ventilation*...

When I think about how I will actually use the house, I always come to the conclusion that in summer I will probably keep the patio door open "permanently" – so the kids can play in the garden, so I can sit on the terrace and read a book, and so on.
But what does that have to do with wanting good, fresh, and above all pollen-free air in the bathrooms and bedrooms? 😕

At most, I have windows open in only one or two living spaces – in the rooms where I spend most of the day. Or do you all keep every window in the entire house open all day??

What is the downside if the controlled mechanical ventilation runs while a window is open? It’s just the electricity consumption...
If I calculate the electricity use per room and then think about how many rooms have windows open, the amount of pointless electricity use is actually quite small...
Unfortunately, a central controlled mechanical ventilation system can’t yet be controlled individually per room in a decentralized way... Maybe that will come someday...

Best regards
Micha 😎

Why can’t you close the door when you want to read on the terrace or the children are playing in the garden? You don’t run in and out every minute; if you do, you’ll just bring pollen, insects, and warm air into the house. At the same time, pollen is also drawn into all the exhaust rooms.

Regards,
Sebastian

haus1212 schrieb:
Sounds somehow dangerous if "mold" could develop inside the pipes? How high is the risk of mold in this case?

Risk of mold? It only exists with uninsulated fresh air or exhaust air ducts during winter, or with active cooling in a mechanical ventilation system with heat recovery during summer. However, I have never heard of this happening or known a case where it was actually a problem. Mold risk is mostly inside the building in winter if there is no ventilation system and windows are never opened! Don’t worry about mold with a mechanical ventilation system with heat recovery. That is probably the rarest problem associated with such systems!

Boergi schrieb:
Why can’t you close the door .......

Closing doors and windows during the day will naturally become a habit; otherwise, rooms in modern buildings can heat up significantly during hot summer periods. Once the heat is inside the building, it becomes difficult to lower the indoor temperature again.
With a controlled mechanical ventilation system, it is possible to specifically use the lowest outdoor temperatures, usually between 4 and 6 a.m., potentially at a higher ventilation rate. At midday, when outdoor temperatures are highest, the system can be turned off completely, possibly also using a summer bypass.
This assumes, however, that no noise is generated even at higher ventilation rates — which requires properly sized ducts. Many systems fail at this point.
Whether this approach is sufficient can only be determined beforehand with a cooling load calculation.

Best regards

Boergi schrieb:
Why can’t you close the door when you want to read on the terrace or the children are playing in the garden?

€uro schrieb:
Closing the doors and windows during the day will become almost automatic,

I agree – that will just happen naturally.
How I will do it myself? Feel free to ask me again in a year – then I will know :p

Best regards
Micha 😎

Hehe, I have to add my two cents as well. In summer (at least with the current temperatures), the doors and windows stay open most of the time. The controlled ventilation system is set to a minimum.
It may be that there are children who don’t want to go in and out every 5 minutes, but then you just leave the doors open anyway 😉