Design Strategies IMPULSE - Sustainable Facades Vol 2

Figure 9. Revised details - First alternative
• A measure of the potential greenhouse gas
emissions associated with the material expressed
as -64 kg CO2 equivalent per square meter.
• The wall is noted to accumulate 0.00 kg/m² of
condensation, which implies excellent moisture
management as no internal condensation is
expected and the temperature of the inside
surface is given as 18.8°C, which leads to a
relative humidity on the surface of 54%. It‘s
stated that mold formation is not expected
under these conditions, indicating a healthy
moisture level within the wall.
Second Alternative:
For second alternative I decided to use cellulose
as an insulation and method is that they push the
cellulose with high pressure inside of the cavity and
also use bitumen coating for internal face of the wall
due to moisturizing reasons.
Calculations
• The overall thermal transmittance of the wall
is given as U=0.22 W/(m²K), which measures
how well the wall can contain heat. standard
(GEG 2020 Bestand) is U=0.24 W/(m²K) and
the current configuration is better than the
standard and it rated in excellent range.
• The wall dries in 93 days. It‘s also noted that
there is no condensate, meaning the wall is not
expected to accumulate moisture internally.
This section is rated as „excellent,“ showing it
has good moisture management.
• A damping of 35 means that the wall can
significantly smooth out the highs and lows of
the external temperature. So, if the temperature
outside fluctuates greatly, inside the building,
those fluctuations will be much less noticeable,
helping to keep the indoor environment more
stable and in this context, „non-relevant“
suggests that due to the wall‘s high level of
insulation, the phase shift is not a significant
factor in its performance. Essentially, the
insulation is so effective that the time it takes
for the outside temperature to affect the inside
is not a concern, as the temperature fluctuation
is greatly dampened and it is in excellent rang
and a phase shift of 13.2 hours means that if
the temperature outside peaks at noon, that
extreme temperature won‘t be felt on the inside
until approximately 13.2 hours later.
• Heat loss during the heating season 17 kWh/m²
and the amount of non-renewable energy, over 117
kWh/m², used in the production of the material. It
includes energy from fossil fuels and nuclear energy.
• A measure of the potential greenhouse gas
emissions associated with the material expressed
as -67 kg CO2 equivalent per square meter.
• The wall does not accumulate condensate, and
it also provides the drying reserve capacity and
the minimum required protection, concluding
that the moisture protection of this component
is rated poorly and The absence of condensate
across the materials suggests good moisture
management within the wall structure the
temperature of the inside surface of the wall and
the relative humidity, which indicates that mold
is not expected to form under these conditions.
5. Conclusion
In conclusion, this thesis has shown that wood fiber
insulation enhances historic buildings‘ thermal
performance and energy efficiency, notably in
half-timber constructions. Its application not only
maintains the structural integrity of these buildings
but also significantly reduces U-values, underscoring
its high efficiency. Furthermore, incorporating a
vapor barrier with wood fiber insulation plays a
pivotal role in controlling moisture transfer from
the inside to the outside. This combination balances
moisture control and insulation needs, ensuring the
building‘s persistence and structural health. The
total internal insulation thickness system ranges
from 95 to 155 millimeters, accommodating various
U-Value requirements. The insulation‘s U-value
improves progressively with increased thickness,
transitioning from 0.24 at 20 mm to 0.16 at 100
mm. A 60 mm thickness was selected for its optimal
balance of thermal performance, making a U-value
that aligns with the standards set forth by the GEG
and KfW and represents a common choice for
diverse structural types. Additionally, the findings
of this research confirm that this insulation method,
including the vapor barrier, complies with current
GEG and KFW regulations, reinforcing its applicability
and relevance in contemporary sustainable building
practice. This marks a significant contribution
to sustainable renovation and conservation of
historical architecture, offering a balanced approach
to modern insulation techniques while respecting
the heritage value of historic structures.
7. References
1. Federal Ministry for Economic Affairs and Energy
(BMWi). (2018). Energy solutions made in Germany.
Berlin, Germany.
2. Federal Ministry for Economic Affairs and Energy
(BMWi). (2020). Energy efficiency strategy for buildings.
Berlin, Germany.
3. Federal Republic of Germany. (2010). National heritage
policy of Germany. Munich, Germany.
4.Federal Ministry for Economic Affairs and Energy
(BMWi). (2018). Climate action plan 2050. Berlin,
Germany.
5. Stefan Hulsbosch, Edwin J. van Dijk, Elisa C. Boelman,
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