ᐅ Question about daily living with a mechanical ventilation system with heat recovery

The cooling is actually done through the underfloor heating system. However, a strong cooling effect should not be expected. If the temperature is set too low, condensation problems can occur on the floor. The airflow from a mechanical ventilation system with heat recovery is also too low to achieve significant cooling effects. So, this should not be confused with a "real" air conditioning system.

Bieber0815 schrieb:
Will opening a window change anything? Nothing changes at the air outlet in the bedroom; the next exhaust (bathroom?) might draw in unconditioned air through the open window. The pressure loss across the filter in the intake duct directly affects the fan, yes. But just an open window should hardly affect the pressure at the supply air outlet or exhaust air vent. Am I missing something?

Just consider the entire house as a closed system. That should answer your question.

Sebastian79 schrieb:
If the system runs at full speed for 10 minutes when a button is pressed (and this happens several times a day), what is better about this than leaving a window open overnight, which supposedly has such a strong impact on the very sensitive system settings?

Exactly! Using a “boost button” increases the input and output values of the system temporarily. An open window introduces a disturbance into the system that lasts for hours.

Do you notice the difference?

Sebastian79 schrieb:
Don’t talk about fixed parameters – normally you can adjust EVERYTHING in the settings because no automation monitors anything.

Exactly! You can set everything manually, but after that the system’s automation does monitor the values. For example, as soon as you switch on the system, the filters start to get dirty. They don’t become clogged all at once but gradually, and over time the volume flows must be maintained according to the set parameters; otherwise, the system wouldn’t deliver the intended effect and every user would be dissatisfied.

So what happens with an open window or an exhaust hood? I think you can figure that out.

Becker84 schrieb:
Do you have CO2 and humidity sensors in every room? So that the airflow automatically increases when you shower or have 15 guests, and shuts off when the house is empty?

I have CO2 sensors at strategic points and one directly in the system. The system is continuously adjusted up or down based on the sensor readings.

I wonder what the bearings of the system would say if it is constantly driven back and forth like that? And yes, this is a completely serious comment – based on your understanding, that’s the only thing your sensors are producing.

You’re really making a science out of this. Just set the ventilator to the normal setting and operate the system manually. Whether I open a window or not doesn’t matter at all. Of course, the ventilation system is somewhat bypassed this way (in an exhaust room like the bathroom, some of the air from the window is immediately drawn out again; in a supply room, some of the air partially flows back out the window), but that’s about it. The other rooms still work exactly as before. Neither does the filter get dirtier nor does any part of the system break or suffer any damage. As soon as I close the window again, the disturbance for the system disappears immediately and it runs as set.

Keeping the window tilted open for a longer time doesn’t make sense, since THAT is exactly the reason for having the ventilation system in the first place.

Sebastian79 schrieb:
I wonder what the bearings of the system would say if it’s constantly being driven back and forth? And yes, this is a completely serious comment – according to your understanding, that’s all your sensors produce.

Unfortunately, you still haven’t understood, but it doesn’t matter; for me, this topic is closed. I have explained how the systems work here, and users need to decide for themselves what to do.

Apparently just as little as you – but sure, let's leave it at that.