Orschel
2012-03-07 15:27:59
- #1
Overall, the costs do not look very promising
No, it really doesn’t look promising! Although I am definitely not willing to pay €2,000 if it really is only about the thermal protection certificate!
The certificate is always just the rough plan, nothing more. Whether the most sensible solution was actually chosen by a structural engineer cannot be judged from a distance. For this, from the perspective of determining the basics, an assessment of the actual demand depending on the chosen building fabric, the climate location, and the user behavior would be necessary. From this actual demand, one can then conclude, in connection with the respective technical solution for heating, hot water preparation, ventilation with heat recovery, the actually expected consumption. This consideration alone leads to a reliable evaluation of the necessary investments.
The homeowner can at best use the certificate for the component geometry and U-values of the components, if controlled residential ventilation with/without heat recovery is installed, the determined air volumes according to the air volume plan according to DIN 1946-6, and the concept specified by the certificate (heat generator etc.) for their calculations!
In the meantime, I have also read quite a lot in special forums for heating planning, and it is also recommended everywhere there not to select a heating system based solely on the energy performance certificate, as it does not include all details! Thanks also for the hint here.
The heating load calculation according to DIN 12831 alone is not sufficient, especially if condensing boilers, heat pumps, or pellet stoves are planned as heat generators.
Modern heating systems can be very efficient, but only if a complete and comprehensive sizing/calculation of all components is available. This includes, among other things, the heating surfaces and, for example, the system hydraulics.
For an open campfire, however, this is not necessary!
OK, after various internet studies I have now read quite a bit that a heating load calculation according to DIN 12831 is important. I think that makes sense since you make various other specifications there as you wrote above.
If this is also not sufficient, can you tell me what besides the energy pass and the heating load calculation is still necessary to select the heating power?
It is now known that builders are being taken advantage of by general contractors with regard to system technology. With the more expensive free architect planning, one should not suspect that. Apparently, the "quick money" is made here at the expense of the builder.
Honestly, that surprises me too, especially since the architect has nothing to gain if the wrong heating system is installed. Also, the heating installer could have an advantage if, due to a wrong calculation, an oversized heating system is installed... Understanding this as a layperson is definitely not easy...