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.
In our climate zone, the annual heating demand can be estimated at about 150 kWh per m² (square meter) per year.
10 kWh correspond to approximately 1 m³ (cubic meter) of natural gas, as well as 1 liter of heating oil, and 2 kg (kilograms) of pellets.
In your case, 150 / 10 * 2 = 30 kg (kilograms) per m² per year.
30 * 550 = 16,500 kg (kilograms) of pellets per year.
Depending on the heating system, insulation, and heating habits, this value may vary slightly.
This means that if your annual pellet consumption is around 16 to 17 metric tons, your heating technician will likely not find anything unusual.
10 kWh correspond to approximately 1 m³ (cubic meter) of natural gas, as well as 1 liter of heating oil, and 2 kg (kilograms) of pellets.
In your case, 150 / 10 * 2 = 30 kg (kilograms) per m² per year.
30 * 550 = 16,500 kg (kilograms) of pellets per year.
Depending on the heating system, insulation, and heating habits, this value may vary slightly.
This means that if your annual pellet consumption is around 16 to 17 metric tons, your heating technician will likely not find anything unusual.
@Musketier
Yes, that’s true. Wood has a primary energy factor of 0.2 (for comparison: gas 1.1, electricity nowadays only 1.8), which significantly improves the primary energy demand that you get to see on the energy performance certificate. This hardly reflects the actual consumption anymore.
The amount of heat needed is more a question of the calculated heating load, which in turn depends on the heated area, the number of occupants (hot water demand), and the insulation quality or heat transmission losses.
I also think that (from a non-expert perspective). I don’t really understand the fuss either.
In our rented house, scaled up over warm months, we need 5,000 kWh of gas per year (just for hot water), and with heating in October, it’s over 45,000 kWh. If our actual annual consumption ends up below 30,000 kWh, I would be more than satisfied (basic data: built in 1974, 180 sqm (roughly 2,000 sq ft) living area, conservatory (fully heated), converted attic).
Yes, that’s true. Wood has a primary energy factor of 0.2 (for comparison: gas 1.1, electricity nowadays only 1.8), which significantly improves the primary energy demand that you get to see on the energy performance certificate. This hardly reflects the actual consumption anymore.
The amount of heat needed is more a question of the calculated heating load, which in turn depends on the heated area, the number of occupants (hot water demand), and the insulation quality or heat transmission losses.
BeHaElJa schrieb:
If you have 500 kg in summer (for what??? – you have solar thermal for hot water) and 1 ton in the transitional month, then 2 tons for a cold month is totally reasonable.
I also think that (from a non-expert perspective). I don’t really understand the fuss either.
In our rented house, scaled up over warm months, we need 5,000 kWh of gas per year (just for hot water), and with heating in October, it’s over 45,000 kWh. If our actual annual consumption ends up below 30,000 kWh, I would be more than satisfied (basic data: built in 1974, 180 sqm (roughly 2,000 sq ft) living area, conservatory (fully heated), converted attic).
T
toxicmolotof10 Nov 2016 09:07On a side note... The collectors on the roof are producing absolutely nothing in the current weather. Neither for hot water nor for heating.
So you inevitably have to rely on pellets.
So you inevitably have to rely on pellets.
H
HilfeHilfe10 Nov 2016 09:10toxicmolotow schrieb:
Just as a side note... The collectors on the roof produce absolutely nothing in the current weather. Neither for hot water nor for heating.
So you inevitably have to rely on pellets.toxicmolotow schrieb:
Just as a side note... The collectors on the roof produce absolutely nothing in the current weather. Neither for hot water nor for heating.
So you inevitably have to rely on pellets.That’s correct. Same principle applies to air-source heat pumps.
Musketier schrieb:
Do you calculate the same way at work? 😉Always in favor of the homeowner! 😀
I probably just multiplied the 2 tons by 10, because 3 days x 10 = 30 days / 1 month... I somehow mixed things up.
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