TGA planner difficulties, underfloor heating supply temperature + wastewater ventilation

So, after a lot of mailings and phone calls, I have at least received the design of the heating system for 40° flow temperature. They do not want to give me the current plan with 38° flow. However, I did manage to arrange a meeting where they want to present the current 38° flow plan. Maybe you can still lend me a hand and help me understand the 40° plan or give me pointers on what else to watch out for. Below I have attached the table with the design. I have added the last line with the heating load I calculated for the supply air (volume flow*heat capacity of air*temperature difference at -16° outside temperature). I have also attached the floor plans. My current goal is to be well prepared for the meeting on Monday so that I can recognize if anything has been roughly planned incorrectly. Many thanks in advance!

Circuit lengths are quite different. Not ideal for hydraulic balancing.

Quickly, one could combine the hallway and the dressing room on the upper floor (=80.8 m²) and convert Room 3 and the bathroom into 2 circuits (67.45 and 63.15 m² respectively).

No wall heating possible in the bathroom?

Is there anything different now? It looks to me like we've already discussed all of this?

Is underfloor heating not possible in the bathroom?

I consider that very difficult to implement under the current developer/planner/general contractor/subcontractor structure.

Is anything different now? It looks to me like we've already discussed all this?

You’re right, we have discussed this. I just wanted to finally provide some data, and sorry, I just noticed that the table was cut off. Attached is the complete table.

Questions that immediately come to mind:
- Does the floor covering have an impact on the required heating load? I assume the MEP planner has calculated with parquet flooring, but we have glued vinyl installed.
- The standard heating load should already include the additional necessary heating load, right? For example, room 15.01 has a heating load of 1912W, of which 490 W are used to heat the supply air, correct?
- What exactly does the column "mbar" indicate?

You are right, we discussed that. I just wanted to finally provide data and sorry, I just noticed that the table was cut off. Attached is the complete table.

ah, now also with heating loads. ;)

- Does the floor covering have an influence on the required heating load? I assume that the TGA planner calculated with parquet and we have glued vinyl installed.

The covering has no influence on the heating load. The load is only what causes losses. But it does make a difference on the generation side. Glued vinyl is more comparable to tiles.

- The standard heating load should already include the additional required heating load, right? For example, room 15.01 has a heating load of 1912 W and of this, 490 W is used for heating the supply air, correct?

That is a good question. I rather suspect that you have to add them together. In my opinion, it is wrong that the bathrooms have no ventilation loss. After all, four degrees colder air constantly flows into the bathrooms.

- What exactly does the column "mbar" indicate?

That indicates the pressure loss.

Standard heating load is usually everything (transmission heat losses + ventilation heat losses). For you it would be 7 kW, which is not little for a new building.

The last column is unclear. Are these now the ventilation heat losses (makes little sense since rooms are missing) or the exchange between the rooms (the hallway is also missing...).