I have the usable floor area from the energy performance certificate, which is 277 square meters. Is the heated building volume then roughly three times that? So approximately 831 cubic meters?
This is not about a 100% precise calculation, just an estimate.
This is not about a 100% precise calculation, just an estimate.
If your entire enclosed volume is heated, a factor of 0.35 (or was it 0.37?) of the cubic volume of your heated area is generally used as a standard assumption for your energy performance certificate. This "useable floor area" also includes stairwells, atriums, and similar spaces. So, this is just a calculated value since air volumes ultimately need to be heated as well.
For a useable floor area of 277 m² (2980 ft²), I am assuming an internal cubic volume of 800 m³ (28,250 ft³). Based on this value calculated from your plans, you can then use the factor to work out your useable floor area again.
For a useable floor area of 277 m² (2980 ft²), I am assuming an internal cubic volume of 800 m³ (28,250 ft³). Based on this value calculated from your plans, you can then use the factor to work out your useable floor area again.
Scout** schrieb:
If your entire enclosed volume is heated, the factor 0.35 (or was it 0.37?) times the volume of your heated area applies as a general assumption for your energy certificate. This "usable floor area" also includes stairwells, atriums, etc. So this is just a calculated value since air spaces ultimately need to be heated as well.
For a usable floor area of 277 m2 (2980 ft2), I assume an internal volume of 800 m3 (28,250 ft3), and from this value calculated based on your plans, you can then use the factor to calculate your usable floor area again. Perfect, thank you very much.
And if I understand correctly, the usable floor area also includes the basement. I could subtract the basement from the usable floor area to calculate the internal volume, right? Or is the unheated basement always included, even if it doesn’t need to be heated and is completely sealed?
If the basement is included within the heated building envelope, it counts as part of it. That’s correct. So, if for programs like KfW you don’t have a specially insulated door (like the side entrance to an unheated garage) and an insulated ceiling for the basement, then in newer houses it’s considered part of the "heated envelope." Whether you actually heat it or not doesn’t matter.
If you want to understand your energy certificate, calculate your building volume once including the basement and once without it: the version that comes close to 800 m³ (28,250 ft³) is the correct one.
If you want to understand your energy certificate, calculate your building volume once including the basement and once without it: the version that comes close to 800 m³ (28,250 ft³) is the correct one.
Scout** schrieb:
If your entire heated volume is considered, the factor 0.35 (or was it 0.37?) of the cubic volume of your heated area is valid as a general assumption for your energy certificate. This "usable floor area" also includes stairwells, atriums, etc. So, this is only a calculated value because air spaces ultimately also need to be heated.
For a usable floor area of 277 m2 (2980 ft2), I therefore assume an internal volume of 800 m3 (28,250 ft3), and from this value calculated based on your plans, you can then use the factor to calculate your usable floor area again. Okay. That would be about 200 m2 (2150 ft2) usable floor area, but how do you calculate that with the factor? 200*0.35 doesn’t make sense?
Sorry, I slightly misremembered the factor:
According to the Energy Saving Ordinance, the value of the usable floor area of a building is calculated using the formula “Aₙ = Vₑ × 0.32” or with the formula “Aₙ = (1/hg - 0.04) × Vₑ” for floor heights that are less than 2.5 m (8.2 feet) or greater than 3 m (9.8 feet) . Simplified, the [B]usable floor area can also be determined by multiplying the living area by a factor of 1.2
860 m² (9,260 ft²) is therefore the (heated) volume of your house.
Note, floor height = clear height plus ceiling thickness plus floor structure (screed, insulation) plus floor covering.
According to the Energy Saving Ordinance, the value of the usable floor area of a building is calculated using the formula “Aₙ = Vₑ × 0.32” or with the formula “Aₙ = (1/hg - 0.04) × Vₑ” for floor heights that are less than 2.5 m (8.2 feet) or greater than 3 m (9.8 feet) . Simplified, the [B]usable floor area can also be determined by multiplying the living area by a factor of 1.2
860 m² (9,260 ft²) is therefore the (heated) volume of your house.
Note, floor height = clear height plus ceiling thickness plus floor structure (screed, insulation) plus floor covering.
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