Nonsense about air conditioning

Then inform yourself about physics, man man man. Only smart asses here. A climate where the dew point is above 22 degrees is practically impossible in Germany. From a dew point of 16/17 degrees, the weather is considered muggy. For the dew point to move to 22 degrees, it requires almost 50% more moisture than what we understand as muggy. These are conditions that prevail in Florida in summer, but such considerations are completely irrelevant for Germany and especially Berlin.

Practically, with such a properly and correctly executed ceiling cooling, you have zero problems and always the perfectly desired temperature without the disadvantages of an air conditioner. The only downside is, it costs a lot of money.

Then inform yourself about physics, man man man. Only smart-asses here. A climate where the dew point is above 22 degrees is practically impossible in Germany.

Very entertaining. How do you actually come up with the 22 degrees? That is not the relevant temperature for the dew point. Besides, it is part of my job to inform others "about physics." Some just don’t want to – those are then smart-asses like you and not the other way around. I would also like to know what the cleanliness of the workmanship has to do with the factual effects of physics. One could also claim: A well-built wooden shed won’t burn.

Just leave it, it's embarrassing.

To the OP: You asked for the royal road, that is clearly the water-based ceiling cooling as a counterpart to underfloor heating. You won’t have any problems with humidity in dry, non-tropical, non-subtropical Germany. But an expert will calculate that for you, so the user doesn’t need to worry about it.

It’s also cheap with an air conditioner. But it’s only second choice because it’s loud, technically inefficient (air as a heat transfer medium!), and an air conditioner can become a breeding ground for bacteria.

Important, if possible, ceiling cooling above both floors and solid ceilings.

Just leave it, it's embarrassing.

Strong statement considering the fact that you didn't even mention the correct temperature for the dew point calculation. Tip: it's not 21 to 22 degrees.

But an expert will calculate that for you

Why calculate if, in your opinion, there are never any problems with moisture?

Maybe the expert also looks into his standard reference, Recknagel, who, when using a cooling ceiling, demands the installation of an air conditioning unit to lower the humidity.

No clue yourself, but calling others smart alecks :rolleyes:

If the surface temperature is 22 degrees, then exactly the 22 degrees are important for the dew point calculation and nothing else. Whether the water inside circulates a few degrees colder to reach the 22 degrees at the surface does not matter.

The surface temperature of 22 degrees is, however, a false assumption. If the room air is also 22 degrees, no energy transfer would take place. Rather, the ceiling surface almost takes on the temperature of the cooling medium. Physically speaking, because the heat transfer between the cooling medium and the ceiling material is much "stronger" than between the ceiling material and the room air. And therefore the ceiling also has, depending on the cooling load, for example 15 degrees surface temperature, and then during muggy weather we very quickly reach the dew point.