Geothermal heat pump single-family house 200m² underfloor heating kfw55 - setting/optimization

I don’t understand what you’ve been trying to explain to me the whole time?! You don’t set a room temperature based on an average value! Over what period? At what outdoor temperature? What do you do if during the period in which you want to calculate the average temperature, the sun keeps shining in continuously? Do you then regulate to 24°C?

You take a maximum temperature that should be reached for each room with closed windows & doors, without occupancy and without solar gain. By the way, this is also how heating load calculation and the sizing of the heating curve work, simplified, but I’m sure you know that. Or have you ever seen a calculation that includes, for example, that the living room is occupied on average by 3 people between 7:00 PM and 11:00 PM?

That it works, you can see with me. I don’t know what you’re doubting...

I don’t understand what you’re trying to explain to me all the time?!

I just want to point out mistakes that ultimately lead to inefficient operation of heating systems. :) But it’s not personal against you. Specifically, my point was that within a "well" insulated house, large temperature differences cannot be achieved. Since the rooms are not insulated, the "fundamental law of heat exchange" applies. So the warmer room transfers heat to the colder one. The colder one can only become colder if it also loses heat. That can only happen to the outside, either through an open window or poor insulation. Both are energy waste.

You don’t set a room temperature based on an average value! .... By the way, this is also how the heating load calculation and the design of the heating curve are simply described, but you probably know that.

Here your two statements contradict each other. Because precisely an average target value, e.g. 20°C, is defined.

Within what period? At what outdoor temperature? What do you do if during the period you want to calculate the average temperature, the sun is shining constantly? Do you then regulate to 24°C? You take a maximum temperature that should be reached for each room with windows & doors closed, without occupancy and without solar gain.

In this section, I do not understand what you are trying to get at at all. However, as already written several times: The system is slow. So there is not much to "control." Closing the valve because the sun is shining is pointless!

You can see that it works with me. I don’t know what you’re doubting...

No, 19.5 was measured. And just because you temporarily lower the temperature by opening windows, it doesn’t mean you have overridden the fundamental law of heat exchange.

Specifically, my point was that within a "well" insulated house large temperature differences cannot be achieved. Since the rooms are not insulated, the "basic law of heat exchange" applies. So the warmer room transfers to the cooler one. The cooler one can only get cooler if it also gives off heat. This can only be to the outside, either through an open window or poor insulation.

By the way, the thermostat in the hallway and the thermostat in the bedroom are on the same wall at exactly the same height. Only, of course, on the opposite side ;-)

Just keep the windows closed for 72 hours and don't cool the rooms down so extremely by ventilating, then you will also see that your bedroom becomes significantly warmer.

Throwing open the windows and letting the room cool down completely, then of course it is clear that the underfloor heating with minimal flow won't warm the room in 8-10 hours. But that doesn't change the fact that in a modern new building you can't get a 5k difference with _normal_ heating behavior in adjacent rooms.

I already did that. It wasn't 72 hours, but 48. It is of course possible that the temperature is a bit higher within 72 hours, but that doesn't correspond to our daily routine. Who is usually not at home for 72 hours?

that has absolutely nothing to do with it, it is only meant to show you that your statement like "no problems" is simply not true. Because you massively influence the thermal envelope of your house by ventilating and cooling down.

I can also say "I have kfw40 and 40° flow temperature and don't get above 20° room temperature" only to say a few posts later that I have all the windows in the house tilted 24/7.