I am more in favor of decentralized systems.
My opinion comes from my logic, which says:
Better 8 external wall units in a single-family house with a total duct length of maybe 3.2m
than 1 central unit with 10, 20, 50, or 70m duct length, which certainly cannot be kept clean easily or perhaps even at all in the long term. Even if there are cleaning options, when would you schedule such a cleaning? At fixed intervals or do an endoscopy beforehand? I, for one, do not want to know what the ducts look like after 15 years! That would be worth a field test! Maybe a small UPUAUT for ventilation ducts could be designed. In the pyramid, it eventually got stuck. =)
Besides, air then has to be moved over a much longer distance.
If one unit fails, not the entire system fails as with a central system.
The external wall units are easily accessible and easy to maintain.
Depending on the budget, one could even equip the rooms gradually with the external wall units if the sleeves and the electrics are arranged beforehand.
I also want to say something about efficiencies:
An incredible amount is thrown around with formulas, foreign words, highly precise calculations, and theories.
The problem is that it is all just theory, or does anyone here really believe that if their exterior wall has a calculated U-value of 0.15, their exterior wall actually has this value?
I dare say the actual deviation can be up to 50%.
Example: The thermal insulation value of wood is assumed to be about 40% better in Switzerland (at least significantly better, and the individual professors argue about the correct value, precisely the value of the wise!) and is inserted into these atomic physics formulas as opposed to Germany.
Well, the Swiss are just a bit better than the Germans in many things =).
Jokes aside, who really believes Swiss wood is so much better? It simply comes down to different specialists and scientists "calculating" this value.
Anyone who is familiar with wood and has worked with it will confirm to me that all this is nonsense.
Unfortunately, I fear it is the same with the specified properties of masonry, insulation materials, etc.
And probably also with the efficiencies and efficiency calculations of heating systems.
Every day, I see that builders argue over whether their wall should or may have a U-value of 0.22 or 0.23.
If you really want to be sure, then after 15 years you would have to open the wall of a skeleton construction with a vapor barrier once and measure how moist or rotten the mineral wool insulation is.
Or ask friends and acquaintances how much energy they consumed and with which companies/materials/techniques they are satisfied.
And then you see how much the U-value of the wall cited when building/buying the house is really worth.
A building services engineer once told me:
Only plan and install materials and devices that have proven themselves on the market for at least 15 years.
The first 15 years are unfortunately the "guinea pig trial period."
Think of the miracle fiber asbestos!
Or lindane, or Xyladecor, or the sun machine.
Who knows what else awaits us in building materials, construction, and heating technology.
I can only say, build houses from materials and with technology that you know work and that have proven themselves relatively well and for a long time.
The entire industry jumps on the insulation, technology, and energy-saving hype and has ensured that the wage/material ratio is around 25/75% instead of around 50/50.
Here I ask myself whether extremely careful craftsmanship in house construction is not even worth as much, if not much more, than special materials and special technology that might be installed by some pushy sales teams along with endless calculations and formulas.
Purchases are made based on emotion, UNFORTUNATELY not on reason!!
Apparently, many builders do not want to hear the truth.
They want to hear how great their dream house will be, what great properties it has, how little energy it consumes, and how great, fast, and cheap it all is. And of course, how quickly they have to sign now so that those great, exorbitant, disproportionately high, and utterly unjustifiable sales commissions can flow quickly.
Building is a tiring, stressful, extremely burdensome time... maybe
the worst event apart from death or illness that a young average family experiences in life.
Therefore, no one should abuse this. No professional house sellers, no planners, no construction companies, no industry, and no one else.
Grade 6,
missed the point, sorry.
I would take the LTM as well.