Control of ventilation systems in single-family houses

Hello,

is there a ventilation system with which the air volume of the rooms can be easily adjusted?

For our understanding, it makes little sense to continuously extract warm air in the bathroom when no one has been there. Therefore, we thought that the air volume could simply be reduced there and after showering, you press a button and then more air is extracted for 30 minutes.

Does anyone know manufacturers that have systems that enable something like this or does it not make sense?

We also want significantly different temperatures in the house, and the ventilation can only distribute one temperature. That would have to be the coldest, wouldn’t it?
Then, for example, we would extract 24°C warm air in the bathroom and then use heat recovery to warm the outside air to 16°C (temperature pantry). And then you would have to supply 8°C again in the bathroom via underfloor heating.
Therefore, it would make sense for us to extract little air there when it is not necessary.

I hope I was able to explain somewhat clearly what our concern is.

You currently have/are planning a central ventilation system, right?

Yes, so far we are planning a central system.

Okay sorry, I unfortunately can't help with that, we are planning a decentralized...

Not possible. Supply air and exhaust air must always have the same quantity, otherwise you create pressure differences. If you reduce the exhaust air in the bathroom, then you must, for example, reduce the supply air correspondingly in the bedrooms.

What works is not distributing the exhaust air volume according to square meters. In the bathroom, for example, we have the same exhaust air volume as in the utility room. The bathroom is twice as large. In the building services room, we have the most exhaust air and it is still the warmest room.

You cannot keep the pantry at 16 degrees and heat the adjacent room to 24 degrees. I would not install any supply air in the pantry at all.

You can reduce the temperature somewhat by adjusting the supply air volume. Instead of 30 cubic meters of supply air in the bedroom (= calculated amount you need to reach degree X), only 20 cubic meters of supply air come in and the underfloor heating is off.

Hello,

to make it short, you are worrying about problems that do not exist.

· The pantry is an exhaust air room, so the problem of 16-degree cold supply air does not arise.

· You will not achieve a temperature range of 16-24 degrees in the house anyway. Even our basement does not get colder than 18 degrees. If you want to store potatoes, you have to do that in the fridge. That’s just how it is in an insulated house.

· The heat energy transport through the ventilation system inside the house is relatively low; the air volumes are simply too small. The ventilation system moves only about 1/3 of the air volume of a kitchen exhaust hood. And that is distributed throughout the entire house!

· You can easily create temperatures in the house that differ by a few degrees. In our case, the bedrooms are just under 20, the bathroom 23, and the living room 22. And all with a constant supply air temperature. As I said, the heat quantities in the supply air are negligible compared to the heating capacity of the underfloor heating.

· The effort with any push buttons that increase the power temporarily can, in my opinion, be saved. Our system, for example, simply runs programmed faster for 2 hours in the morning, otherwise 24/7 constantly at level 1. That’s enough and it works. If you want something that sucks the shower steam out of the air in 3 minutes in the bathroom, you need something with the throughput of a kitchen exhaust hood… a controlled residential ventilation system has too low throughput to achieve that. Or you simply open the window for 2 minutes in the old-fashioned way.

· The only control that makes sense is a central option to switch off the system for 2-4 hours. That is when the system temporarily sucks in grill/fireplace/campfire/farmer spreading manure odors. No matter how cleverly you direct your intake, that will always happen depending on the wind direction.

Best regards,

Andreas