rudiherbert
2017-01-03 10:30:01
- #1
Hello. I want to buy a new apartment in a multi-family house (5 units). The new building was completed in summer 2016. Since this building is according to Kfw70 and there are no reference points regarding energy consumption yet, I have received the energy certificate. The heating system is a pellet heating system with solar support.
Regarding the energy certificate for residential buildings according to §§16 Energy Saving Ordinance
- detached multi-family house
Building usable area 900m2 (is this the area that must be used to calculate the pellet quantity? or the living area?)
Volume 2800m3
Envelope area 1300m2
Final energy demand? 55 kwh
Primary energy demand 17 kwh
Solar energy 19%
Biomass 81%
Actual value annual primary energy demand 17 kwh
Energy saving ordinance new building 52 kwh (-15%, -30%, -50%)
Question:
So the building is operated with a pellet heating system and a solar collector system on the roof (for heating support and hot water via a buffer tank).
The apartments have underfloor heating and window ventilation with bathroom ventilation.
The current owners told me that the pellet consumption is extremely high!
(December approx. 1.7 tons with no severe winter so far, Nov. 1.5 tons, Oct. 1 ton.)
More information about pellet consumption could apparently not yet be collected.
If I extrapolate the pellet consumption, I come to a pellet consumption of approx. 14 tons!
What would be the actual calculated pellet consumption for this building based on the energy certificate approximately?
54 kwh/m2 with a building usable area of 900 m2 = 48600 kwh.
5 kwh should be approx. 1 kg pellets. That would be 9700 tons.
So much less than in reality!
Or how can one calculate the approximate pellet consumption based on the above data?
Thank you very much
Regarding the energy certificate for residential buildings according to §§16 Energy Saving Ordinance
- detached multi-family house
Building usable area 900m2 (is this the area that must be used to calculate the pellet quantity? or the living area?)
Volume 2800m3
Envelope area 1300m2
Final energy demand? 55 kwh
Primary energy demand 17 kwh
Solar energy 19%
Biomass 81%
Actual value annual primary energy demand 17 kwh
Energy saving ordinance new building 52 kwh (-15%, -30%, -50%)
Question:
So the building is operated with a pellet heating system and a solar collector system on the roof (for heating support and hot water via a buffer tank).
The apartments have underfloor heating and window ventilation with bathroom ventilation.
The current owners told me that the pellet consumption is extremely high!
(December approx. 1.7 tons with no severe winter so far, Nov. 1.5 tons, Oct. 1 ton.)
More information about pellet consumption could apparently not yet be collected.
If I extrapolate the pellet consumption, I come to a pellet consumption of approx. 14 tons!
What would be the actual calculated pellet consumption for this building based on the energy certificate approximately?
54 kwh/m2 with a building usable area of 900 m2 = 48600 kwh.
5 kwh should be approx. 1 kg pellets. That would be 9700 tons.
So much less than in reality!
Or how can one calculate the approximate pellet consumption based on the above data?
Thank you very much