Controlled residential ventilation (heat recovery) + air well + exhaust hood and "independent" chimney

Can only say something about laying on the raw floor of the base slab: We had considered it in the meantime, but decided against it because otherwise we wouldn’t have managed with the thermal insulation. Do you also have insulation under the base slab? Then it might work for you. I only have insulation on the base slab and thus planned 10cm EPS 0035 as thermal insulation. Even if you now use a 65 flat duct, you have to achieve the insulation values of 10cm EPS with 3cm including a small tolerance. That is not possible even with PUR/PIR 0023. Then I found vacuum insulation panels, but they are simply too expensive. Therefore, we are installing the ventilation for the ground floor in the floor structure of the ground floor and for the upper floor behind the drywall to the roof.

I would always install valves in the ceiling if possible.
UG in filigrandecke
OG in suspended ceiling
However, the ceiling height in the OG must be suitable for this.
The chimney sweep master will tell you if the air for the chimney is permissible.

I would personally make air wells dependent on radon. Does the soil or groundwater level suit you?

Short answers to the emerging questions.

Space for excavation is available at 2200sqm, we are also already having 90cbm of good topsoil delivered by friends from Berlin, as they otherwise have to "dispose" of it expensively and we need to fill the plot well anyway (Brandenburg area, from 40cm only yellow sand), so the approximately 90cbm for the air well don’t weigh that much.

Neighbors’ well is at about 9-11 meters, so I would say the groundwater level is fine and radon is not an issue according to the map (but I would still want to use the option with pond liner).

Air well: Rough costs calculated are 600-800€ for piping, filling material including transport another 1000-1500€ + pond liner, but minus EWT or brine EWT and enthalpy savings. (I find the solution from "Allroundbastler" Leipzig, I believe video 3 or 4, very good)

Flexible pipes in floor slab:

Therefore, the 75mm OD pipes should be well integrable into the 140mm insulation (alternatively insulation under floor slab, noted for the appointment with the architect).
For the 100mm on the upper floor, I think it’s somewhat easier, since they are supposed to disappear in the 200mm ceiling anyway.

For the ceiling heights, we stayed with the classic 2.50m, since we didn’t really see the added value in 200mm.

: "If possible, I would always place valves in the ceiling.", why only in the ceiling?
- better distribution or possibly also because of the "tripping hazard"?

The chimney sweep even said "old is better in his opinion" and therefore pipe under the floor slab, single-flue chimney only, controlled residential ventilation with "chimney function" and pressure sensor switched between chimney and controlled residential ventilation. (even for BIPT chimney).
Regarding kitchen exhaust air, he also suggested possibly contact for a window (quick and dirty) or properly with pipe through wall or floor slab.

Does anyone possibly have input on the arrangement of the valves and possibly the calculation of the volumes?

Thanks already now for your feedbacks. :)

Very small picture but it worked with zoom. 140mm impact sound insulation doesn’t really make sense or do you have a basement? I think 110mm thermal insulation and 30mm stapler system are meant. As I said, if you lay the pipes in there, you’re missing at least 60mm thermal insulation under the pipe. You can’t compensate for that with "normal" insulation boards. You definitely have some cooled air in winter and possibly even thermal bridge issues. Which might never affect you because of the different vapor barriers in the structure, but I wouldn’t feel comfortable with the thought that along the ventilation pipes under my floor any condensation water lakes are forming. And maybe condensation even forms inside the pipes. So yes, either insulation under the floor slab or vacuum insulation boards or in the ceiling.

At the time of the draft, the Controlled Residential Ventilation was not yet an issue (approval planning); now for the execution planning, I have to discuss the topic in detail again with the architect. Without a basement and currently planned are/were 140mm impact sound insulation, 70mm screed including heating, and 10mm covering, so a total of 220mm.