Hello everyone,
I currently need to decide on the thickness of our ETICS (External Thermal Insulation Composite System) for the facade. According to the energy-saving regulations, I need at least 12cm (5 inches) on my precast concrete elements.
I have now received quotes for 14cm (5.5 inches), 16cm (6.3 inches), and 18cm (7 inches) as well.
According to the architect, the energy demand differs as follows:
Thickness Final Energy Demand Primary Energy Demand
12 cm (5 inches) 17.70 31.87
14 cm (5.5 inches) 17.66 31.78
16 cm (6.3 inches) 17.04 30.67
18 cm (7 inches) 17.01 30.62
The units are kWh/m²a.
So, what now?
The house has a full basement. Basement and roof insulation are not to be considered here. Geothermal energy will be used as the energy source, and a controlled mechanical ventilation system with heat recovery will be installed. The windows have triple glazing. Overall, about 220 m² (2370 ft²) of living and usable space will be fully heated (attic insulated but not heated).
Do I now have to multiply the difference by the living/usable area, apply my average kWh price, and that will be the additional annual cost? Or am I thinking about this incorrectly?
Thanks and regards,
Markus
I currently need to decide on the thickness of our ETICS (External Thermal Insulation Composite System) for the facade. According to the energy-saving regulations, I need at least 12cm (5 inches) on my precast concrete elements.
I have now received quotes for 14cm (5.5 inches), 16cm (6.3 inches), and 18cm (7 inches) as well.
According to the architect, the energy demand differs as follows:
Thickness Final Energy Demand Primary Energy Demand
12 cm (5 inches) 17.70 31.87
14 cm (5.5 inches) 17.66 31.78
16 cm (6.3 inches) 17.04 30.67
18 cm (7 inches) 17.01 30.62
The units are kWh/m²a.
So, what now?
The house has a full basement. Basement and roof insulation are not to be considered here. Geothermal energy will be used as the energy source, and a controlled mechanical ventilation system with heat recovery will be installed. The windows have triple glazing. Overall, about 220 m² (2370 ft²) of living and usable space will be fully heated (attic insulated but not heated).
Do I now have to multiply the difference by the living/usable area, apply my average kWh price, and that will be the additional annual cost? Or am I thinking about this incorrectly?
Thanks and regards,
Markus
T
toxicmolotof14 Mar 2018 17:24Do you have the product name of the insulation? Then we could check if that’s correct. But 50% more insulation would only have such a small effect? I’m not an expert, but I find that confusing.
What are the 225 m² (2,422 sq ft) in your calculation? The insulated exterior surface area or the living area?
What are the 225 m² (2,422 sq ft) in your calculation? The insulated exterior surface area or the living area?
The 225 m² (2,421 sq ft) refers to the living area.
The specification was "EPS insulation board with a thermal conductivity of 0.034 W/(m·K) without facing."
I was told that the building services have a disproportionate impact on the values, so the insulation doesn’t really make much difference.
Regards,
-Markus-
The specification was "EPS insulation board with a thermal conductivity of 0.034 W/(m·K) without facing."
I was told that the building services have a disproportionate impact on the values, so the insulation doesn’t really make much difference.
Regards,
-Markus-
You do not need to use the living area but rather the wall area that will be covered with insulation.
For example, if you have an exterior wall that is 10m (33 feet) long and 3m (10 feet) high, that equals 30 sqm (square meters). You should calculate this for all other exterior walls as well and then add them together.
For example, if you have an exterior wall that is 10m (33 feet) long and 3m (10 feet) high, that equals 30 sqm (square meters). You should calculate this for all other exterior walls as well and then add them together.
Exactly.
Your heat pump has 10.4 kW. That is quite a lot.
I am currently planning as well, and I was offered a modulating heat pump with a maximum of 12 kW along with a borehole for 11 kW. I did some calculations and found a heating load of just under 5 kW!
Heating engineers seem to prefer to play it safe.
Your heat pump has 10.4 kW. That is quite a lot.
I am currently planning as well, and I was offered a modulating heat pump with a maximum of 12 kW along with a borehole for 11 kW. I did some calculations and found a heating load of just under 5 kW!
Heating engineers seem to prefer to play it safe.
I roughly calculated it. With a reserve for hot water and my wife being sensitive to cold, it should be fine – I’m coming up with just under 8 kW, so 7.6 would be a bit tight for me.
The borehole was reduced from 2x90 to 2x80. I would have preferred one deep borehole, but that’s not possible here (water protection zone IIIA and not very productive).
Regards
-Markus-
The borehole was reduced from 2x90 to 2x80. I would have preferred one deep borehole, but that’s not possible here (water protection zone IIIA and not very productive).
Regards
-Markus-
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