Volume flow rate specification of controlled residential ventilation for heating load calculation

well, decentralized kWh in push-pull operation like this (that's how I understood it as a layman) > heat storage component is heated on one side by outgoing air, on the other side the incoming air is reheated by this preheated component. but everything is still far from the efficiency of a rotary heat exchanger in a central controlled residential ventilation system. the whole thing preferably in one device (in/out also in quick succession). my brother-in-law (HVAC planner!) installed it in a rental apartment - horribly loud (mathematically good ;-) )

Sorry, I have to follow up because I still don’t quite understand the values and I now need to provide the "Heizlastberechner" with something final and as accurate as possible.

According to the manufacturer’s datasheet, the fan has
Airflow in ventilation mode (m3/h): Level 1=15; Level 2=30; Level 3=50
Airflow in regeneration mode (m3/h): Level 1= 8; Level 2=15; Level 3=25

So apparently in regeneration mode, half the airflow is assumed because the fan changes its rotation direction and then runs 50% of the time in the other direction. Apparently, only the exhaust or only the supply air is considered.

But I have 2 fans, and if, for example, you consider the supply air, the 2nd fan will be working on supply air during the time when the 1st fan is working on exhaust air. So I would have double the supply air than what is stated under regeneration mode.

So, based on this information, I would have to specify a volume flow of 30m3/h at level 2, right?

well, decentralized kWh in push-pull operation like this (that's how I understood it as a layman) > heat-storing component is heated on one side by outgoing air, on the other side the incoming air is reheated by this previously warmed-up component.

Yes, exactly like that. With the reversing devices, just one after the other. First, the warm room air drawn in preheats the ceramic. Then, when the cold outside air is drawn in, it is preheated again by the stored energy from the ceramic. Since the stored heat only lasts for a certain time, this process has to be repeated continuously.

So according to this information, one would have to specify a volume flow of 30m3/h already at level 2, right?

Yes, in this case you get 30cbm/h because two fans are in regeneration mode. And wire them so that they are not both doing the same thing.

Yes, in this case you get 30cbm/h because two fans are in regeneration mode. And wire them in such a way that they don't both do the same thing.

Yes, the system does that automatically if configured accordingly. One is the master and the other always adjusts the rotation direction opposite to the master.