Electric surface heating (Thermoheld) in KFW 40 bungalow with 80 sqm

  • Erstellt am 2023-10-01 13:42:04

eenuep1

2023-10-07 16:20:53
  • #1
With a maximum of 20% instead of 100% additional demand, that would be 3000 kWh - then the value of the provider is probably correct after all.
 

dertill

2023-10-08 07:40:25
  • #2

You cannot calculate it like that or some assumptions are too optimistic.

For the transmission losses, always use the outer surface area.
Additionally, add a flat 0.05 W/m2K for thermal bridges on the wall area.
For windows, only 0.6 for the glass (Uw-value). With the frame rather 0.8-0.9 (Uf-value).

For the total calculation do not use average temperature and days.
Find the heating degree days for 22° indoor temperature and 15° heating limit temperature for your region.
You then apply these also to the ventilation losses and calculate with an air exchange rate for the total volume of 0.4/h-0.5/h.
With heat recovery, you can deduct 50% from that. The system may have 90% efficiency, but you also have leaks.

I have just calculated that here for another house. I just can’t find it right now.
 

RotorMotor

2023-10-23 10:09:35
  • #3
It would be great to share some information from the user here! :)
 
Oben