Control climate with underfloor heating or via the ventilation system?

  • Erstellt am 2015-10-25 09:42:42

Mycraft

2015-11-24 21:01:38
  • #1
I have to disappoint you, I am not wrong, I have real experience, I have also described it once before in another thread where we already discussed the matter.

The WRG is out of operation in summer anyway... it has absolutely nothing to do with air conditioning cooling... yes, of course air cooling is absolutely terrible in terms of efficiency... nevertheless, for two summers now I have achieved pleasant temperatures throughout the entire upper floor with ONE 3500 watt unit in the upper floor...

I think I also wrote that I will probably get a similar unit for the ground floor to cool the whole house...

But it would certainly also be sufficient to simply install a 7KW unit with a ceiling cassette in the stairwell.

You cannot compare commercial and private use at all, because there are completely different wishes and requirements for the units in both areas.
 

Sebastian79

2015-11-24 21:26:48
  • #2
Well, with our 3kW system we barely kept the living room cool - in the adjacent rooms you didn’t notice anything.

And with the controlled residential ventilation, the heat recovery was always on... and that already has something to do with the air conditioning, because it works against it.

That’s why, in my experience, it is like that and that’s why there is a device in every bedroom and living room...
 

Mycraft

2015-11-25 14:51:12
  • #3
Yes, I don't want to argue about that, I just noticed the effect and see it every summer...you can really feel the temperature limit when you go up the stairs.

Every air conditioning unit just briefly coughs at the heat recovery of the [Kontrollierte-Wohnraumlüftung] and simply continues to cool...this is negligible with the moving air volumes and is usually off in summer anyway since there is nothing to recover.
 

Saruss

2015-11-25 15:14:24
  • #4
Firstly, the controlled residential ventilation really has very little air throughput compared to an air conditioner, and especially the heat recovery would be positive for cooling, because it works in both directions, meaning the incoming warm air is cooled by the heat exchanger, that is also the case with me (and for that, my controlled residential ventilation also has a condensate drain/connection). In contrast, the bypass of my (by the way also Helios controlled residential ventilation with the really good easycontrols user interface and well-documented Modbus protocol) is set so that it only opens in summer when it is cooler outside than inside.
About Mycraft:
You can definitely feel the temperature limit, especially if the AC is in the hallway, but do all rooms really cool effectively? I also notice the limit in summer when I go to the basement, which is, by the way, pleasantly cool completely free of charge.
It seems a bit strange to me, especially since the cold air would much rather want to go down to the ground floor than stay upstairs..
 

Mycraft

2015-11-25 19:49:47
  • #5
The floors are not hermetically sealed from each other, of course a good part of the cooled air also ends up on the ground floor...
 

Saruss

2015-11-25 20:05:37
  • #6
Therefore, I just can't imagine that it is significantly cooler everywhere on the upper floor. In our case, the open (!!) basement stairs managed to maintain about a 7°C temperature difference on the hottest days. Despite my skepticism about the distribution of "cold" through the medium of air, one otherwise has to agree with the law of conservation of energy: If you "throw" energy out of the house with an air conditioner, it is colder. Over a longer period, thanks to good insulation, it is certainly also uniformly cold everywhere in the room, as the heat energy that is still there distributes evenly. I can imagine that it works, but not that it is fast or comfortable; because where the device is running it would have to be significantly colder than in the other rooms, which doesn't sound very cozy.
 

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