ᐅ Who should you entrust with the room-by-room heating load calculation?
Created on: 2 Feb 2020 12:23
A
annab377
Hello everyone,
Do heating system installers know that underfloor heating is best sized and planned using a room-by-room heat load calculation?
Is the room-by-room heat load calculation also important for selecting the heat pump (in our case either water-to-water or ground-to-water), or is the "overall heat load calculation" of the entire building according to DIN 12831 sufficient?
If my architect does not offer this, who should I turn to? What should I look for in the phone directory / on the Internet to find a professional who can assist me with this?
From what I have read here in the past months, a room-by-room heat load calculation is very important. A precise calculation can save money because the heat pump selected accordingly will operate more efficiently, allowing the house to be heated more effectively.
Thank you for your answers,
Greetings from BaWü
Ann.
PS: Am I mistaken, or can the overall heat load calculation according to DIN 12831 really be verified or recalculated by oneself (assuming you have all the U-values of the building envelope, of course)? Are there already ready-made templates available on the Internet for this? Maybe also for the room-by-room heat load calculation, or is that usually too complex for the homeowner?
Do heating system installers know that underfloor heating is best sized and planned using a room-by-room heat load calculation?
Is the room-by-room heat load calculation also important for selecting the heat pump (in our case either water-to-water or ground-to-water), or is the "overall heat load calculation" of the entire building according to DIN 12831 sufficient?
If my architect does not offer this, who should I turn to? What should I look for in the phone directory / on the Internet to find a professional who can assist me with this?
From what I have read here in the past months, a room-by-room heat load calculation is very important. A precise calculation can save money because the heat pump selected accordingly will operate more efficiently, allowing the house to be heated more effectively.
Thank you for your answers,
Greetings from BaWü
Ann.
PS: Am I mistaken, or can the overall heat load calculation according to DIN 12831 really be verified or recalculated by oneself (assuming you have all the U-values of the building envelope, of course)? Are there already ready-made templates available on the Internet for this? Maybe also for the room-by-room heat load calculation, or is that usually too complex for the homeowner?
The building’s heating load is calculated according to DIN 12831, right? Or does the room-by-room heating load calculation also fall under the scope of DIN 12831?
Maybe it’s worth contacting the experts from the KfW-dena list mentioned by @wpic to specifically ask if they offer room-by-room heating load calculations for underfloor heating systems with heat pumps operating at low supply temperatures. Then you can check what they charge for this service.
I also think a typical heating installer might not have the time for this or doesn’t do it often due to time constraints.
Is that the file "Heizungstabelle.ods" from the aquarea wiki page?
Maybe it’s worth contacting the experts from the KfW-dena list mentioned by @wpic to specifically ask if they offer room-by-room heating load calculations for underfloor heating systems with heat pumps operating at low supply temperatures. Then you can check what they charge for this service.
I also think a typical heating installer might not have the time for this or doesn’t do it often due to time constraints.
face26 schrieb:
Calculate the room-by-room heating load yourself using Excel and the data from the Energy Saving Ordinance, and design the underfloor heating yourself. It takes some time, but you don’t need to be an engineer to manage it.
Is that the file "Heizungstabelle.ods" from the aquarea wiki page?
hegi___ schrieb:
He usually calculates the energy consumption but not the heating load of the building, and certainly not the room heating load. However, this does not mean that he does not offer it.
annab377 schrieb:
Is that the file "Heizungstabelle.ods" from the aquarea wiki page? No, but it can be found on that page. It is called Heizungstabelle_v00.xlsx
S
Strahleman3 Feb 2020 09:08Our energy consultant did not offer this service. We then had it done externally via the internet (through a provider with “heating load” in their website name). I wasn’t completely satisfied with the results. For the underfloor heating design, requirements such as maximum flow temperature or pipe sizing were not considered, and the ventilation losses were overestimated (assumed airtightness of the house was n50 = 1.9/h. Our site manager mentioned values below 1.0/h). The domestic hot water demand also seemed to be set quite high. Therefore, we used the calculation only as a rough basis and manually checked the ventilation losses again.
Overall, the provider is okay if you specify the airtightness yourself and avoid letting them handle the underfloor heating design. The latter is not expensive but not worthwhile. We paid less than 200 euros, so it was still acceptable, especially since we could refute the 10 kW heat pump initially targeted by the contractor (according to the calculation, we need less than 5 kW).
Overall, the provider is okay if you specify the airtightness yourself and avoid letting them handle the underfloor heating design. The latter is not expensive but not worthwhile. We paid less than 200 euros, so it was still acceptable, especially since we could refute the 10 kW heat pump initially targeted by the contractor (according to the calculation, we need less than 5 kW).
@Strahleman was that Heizlast de or heizlastberechnung com? It would be good to know who is not delivering satisfactory work. And regarding the ventilation losses, you mean the mechanical ventilation system with heat recovery, right? But isn’t that usually calculated and properly configured quite reliably by the mechanical ventilation provider themselves (for example, the well-known Zehnder)?
@face26 thanks, I found the document.
@face26 thanks, I found the document.
annab377 schrieb:
@Strahleman And regarding ventilation losses, you mean the mechanical ventilation system, right? But isn’t that usually calculated and properly configured quite reliably by the mechanical ventilation provider themselves (for example a well-known one like Zehnder)?
@face26 thanks, I found the document.The planning of the mechanical ventilation system is (hopefully correctly) done by the installer or the manufacturer.
However, when calculating the heating load, it is important to take the resulting ventilation losses into account. Because the energy that is lost through ventilation must be compensated by the heating system. This is part of the heating load calculation.
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