ᐅ Is the T8 Poroton brick only significantly better than the T12 in terms of heating costs?
Created on: 16 Dec 2015 16:38
K
kalle2000
Hello everyone,
we are converting a barn into a residential house. The existing walls will remain, and essentially a new structure will be built inside. The wall composition is as follows:
30 cm solid clinker brick
4 cm air gap
36 cm T12 Poroton blocks
1.5 cm lime-cement plaster
This results in a U-value of 0.27 W/m²K.
For comparison:
30 cm solid clinker brick
4 cm air gap
36 cm T8 Poroton blocks
1.5 cm lime-cement plaster
This results in a U-value of 0.19 W/m²K.
Our energy consultant calculated heating costs of 930 € for the T12 version, based on a building area of 240 m² (2583 ft²) and heating with an air-source heat pump. For the T8 version, the estimated cost is 890 €. However, it should be noted that he incorrectly used an electricity cost of 7 cents per kWh. Currently, our rate is at least 18 cents per kWh.
Is it possible that the better-quality blocks only have a minimal effect on heating costs?
Regards, Tobias
we are converting a barn into a residential house. The existing walls will remain, and essentially a new structure will be built inside. The wall composition is as follows:
30 cm solid clinker brick
4 cm air gap
36 cm T12 Poroton blocks
1.5 cm lime-cement plaster
This results in a U-value of 0.27 W/m²K.
For comparison:
30 cm solid clinker brick
4 cm air gap
36 cm T8 Poroton blocks
1.5 cm lime-cement plaster
This results in a U-value of 0.19 W/m²K.
Our energy consultant calculated heating costs of 930 € for the T12 version, based on a building area of 240 m² (2583 ft²) and heating with an air-source heat pump. For the T8 version, the estimated cost is 890 €. However, it should be noted that he incorrectly used an electricity cost of 7 cents per kWh. Currently, our rate is at least 18 cents per kWh.
Is it possible that the better-quality blocks only have a minimal effect on heating costs?
Regards, Tobias
K
kalle200017 Dec 2015 10:33So it can be said that financially, it is not worthwhile to choose better bricks just to significantly reduce heating costs.
Is it possible to roughly say that the annual heating costs are typical for the size of the building? I somehow find it quite high...
Is it possible to roughly say that the annual heating costs are typical for the size of the building? I somehow find it quite high...
85 kWh/m²a is relatively high compared to new builds, but 240 m² (2583 sq ft) of living space is also quite large.
We have a pure heating energy demand of 8300 kWh for 190 m² (2045 sq ft).
This can certainly be improved further.
But honestly, even €150 for heating per month isn’t going to break the bank.
We have a pure heating energy demand of 8300 kWh for 190 m² (2045 sq ft).
This can certainly be improved further.
But honestly, even €150 for heating per month isn’t going to break the bank.
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