Whom to entrust with the room-wise heating load calculation?

  • Erstellt am 2020-02-02 12:23:02

annab377

2020-02-03 08:40:27
  • #1
The heating load of the building is calculated according to DIN 12831, isn't it, or does the room-by-room heating load calculation also fall under the calculation according to DIN 12831?

So one should maybe contact the experts from the KfW-dena list mentioned by and specifically ask if they offer the room-by-room heating load calculation for an underfloor heating system with heat pump with low flow temperatures. Then just see what they charge for it.

I also think that a normal heating engineer does not have time for this due to time constraints / does not do this often (lack of time)!?



Is that the file "Heizungstabelle.ods" from the aquarea wiki page?
 

tomtom79

2020-02-03 08:51:15
  • #2
But that does not mean that he does not offer it.
 

face26

2020-02-03 09:03:57
  • #3


No, but it can be found on the page. It is called Heizungstabelle_v00.xlsx
 

Strahleman

2020-02-03 09:08:06
  • #4
Our energy consultant did not offer it. We then had it done externally via the internet (through a provider who has heating load in their website name). I was not 100% satisfied with it. For the underfloor heating design, specifications such as maximum flow temperature or pipe dimensioning were not considered, and the ventilation losses were set too high (assumed airtightness of the house was n50=1.9/h. Our site manager talked about values below 1.0/h). The domestic hot water was also felt to be set fairly high. Therefore, we only used the calculation as a rough basis and recalculated the ventilation losses manually.

Overall, the provider is okay if you specify the airtightness and do not let them handle the underfloor heating design. The latter is not expensive but not worthwhile. We paid under 200 euros for everything, so it was still okay, especially since we could refute the 10 kW heat pump targeted by the heating contractor (according to the calculation we need under 5 kW).
 

annab377

2020-02-03 09:14:17
  • #5
was that then Heizlast de or heizlastberechnung com? It would be good to know who is not working satisfactorily. And regarding the ventilation losses, you mean the controlled residential ventilation, right? But isn't it usually calculated and configured quite reliably by the controlled residential ventilation provider itself (e.g. the quite well-known Zehnder)?

thanks, I found the document.
 

face26

2020-02-03 09:24:27
  • #6


The planning of the controlled residential ventilation is (hopefully correctly) done by the installer or manufacturer of it.

However, when calculating the heating load, it is about taking the resulting ventilation losses into account. Because the energy lost through ventilation has to be compensated by the heating system. This is part of the heating load calculation.
 

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