ᐅ Extremely High Pellet Consumption (200 kg in 3 Days) in a KfW 70 Multi-Family House!
Created on: 9 Nov 2016 14:35
R
rudiherbert
Hello,
I just noticed the following regarding our pellet heating system (6-family new build, KfW70 standard). This is a new build and the first winter...
The consumption in October (which was very mild here) was 1000 kg.
Currently, the consumption is 200 kg over 3 days!
Projected, that would be 2,000 kg per month!
Although temperatures have dropped somewhat, there is still no sign of a harsh winter.
Here is what I observed about the pellet heating system (Eta 20-30).
The underfloor heating temperature is 56°C (133°F) with an outside temperature of 1°C (34°F).
Supply temperature to the underfloor heating in the boiler room is only 30°C (86°F)? The return temperature is the same?
The supply temperature shown inside the apartment is 38°C (100°F) when the room thermostat is active, and 20°C (68°F) when inactive.
The buffer tank is supported by solar thermal collectors on the roof (for domestic hot water and heating).
I am certain that this consumption cannot be correct!
The new build is well insulated. The building is dry. Everyone heats reasonably and ventilates correctly.
2,000 kg of pellets per month in winter is extremely high!
In October, we used 1,000 kg.
In summer, about 500 kg per month.
Before contacting the heating technician or property management, I wanted to get some advice here.
Thank you.
I just noticed the following regarding our pellet heating system (6-family new build, KfW70 standard). This is a new build and the first winter...
The consumption in October (which was very mild here) was 1000 kg.
Currently, the consumption is 200 kg over 3 days!
Projected, that would be 2,000 kg per month!
Although temperatures have dropped somewhat, there is still no sign of a harsh winter.
Here is what I observed about the pellet heating system (Eta 20-30).
The underfloor heating temperature is 56°C (133°F) with an outside temperature of 1°C (34°F).
Supply temperature to the underfloor heating in the boiler room is only 30°C (86°F)? The return temperature is the same?
The supply temperature shown inside the apartment is 38°C (100°F) when the room thermostat is active, and 20°C (68°F) when inactive.
The buffer tank is supported by solar thermal collectors on the roof (for domestic hot water and heating).
I am certain that this consumption cannot be correct!
The new build is well insulated. The building is dry. Everyone heats reasonably and ventilates correctly.
2,000 kg of pellets per month in winter is extremely high!
In October, we used 1,000 kg.
In summer, about 500 kg per month.
Before contacting the heating technician or property management, I wanted to get some advice here.
Thank you.
R
rudiherbert12 Nov 2016 11:49Alex85 schrieb:
The equation doesn’t add up because, on the one hand, the primary energy demand was used as a consumption value, and on the other hand, the living area was applied, which is not correct. The area figures in the energy certificate refer to the total area within the heated envelope (calculated based on the volume multiplied by a fixed factor). In other words, the usable floor area. Of course, this is again quite imprecise because the fixed conversion factor does not account for unusual or varying ceiling heights.Thanks for all your great help!
Now I have the correct supply temperatures!
Underfloor heating supply in the boiler room is 48°C (118°F)!
Underfloor heating return in the boiler room is 32°C (90°F)!
In the apartments, the underfloor heating supply currently reaches about 38°C (100°F)!
All this at an outside temperature of +2°C (36°F)!
Again, my question:
Are these high supply temperatures normal for a KfW70 multi-family house with about 550 m² (5,920 ft²) of living area and approximately 950 m² (10,230 ft²) of total building area with a pellet heating system?
Or are they rather too high, which might explain the increased pellet consumption at the moment?
(For example, 500 kg of pellets in summer was assumed! Pellet consumption of 2 tons from mid-October to mid-November seems correct!)
I want to ask the heating engineer if the heating curve/setting is correct or if it was initially adjusted to “get warm quickly and reliably”...
Many thanks!
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