advanced building skins 14 | 15 June 2012 - lamp.tugraz.at - Graz ...

Primary energy,
non renewable
kWh per m² GFA
75
50
25
0
‐25
‐50
‐75
‐100
‐125
‐150
‐175
‐200
‐225
‐250
Advanced Building Skins
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28
‐100
30 years
- 7 -
Greenhouse gas
emissions
kg CO 2‐Equ. per m² GFA
EPS (30 kg/m³) PE‐non‐ren. Wood fibre PE‐non‐ren.
Glass wool PE‐non‐ren. Flax board PE‐non‐ren.
EPS (30 kg/m³) GWP100 Wood fibre GWP100
Glass wool GWP100 Flax board GWP100
Figure 3: Ecological profile of insulation materials per square meter gross floor area. Comparison of opaque PH
skin Mühlweg-C with LEH-skin scenario 5-a. Differences of nonrenewable primary energy demand and
greenhouse gas emissions per gross floor area (GFA) for production, disposal and 30 years building operation.
2.3 Differences of LC-Databases
A sensitivity analysis was done for the assessment of insulation materials by comparing different
databases with life cycle impact data for insulation materials. The data for production (cradle to gate
analysis) and production combined with end of life processes were analyzed. Databases Ökobau.dat
2009 (ÖBD) [5], Ecoinvent 2.2 (ECOINV) [7] and Baubook [8] have been compared. Major
differences of the methodology behind the databases are:
Energy mix (electrical energy mix) for production and for environmental credits of thermal
treatment with combined heat and power generation.
Share of secondary raw materials: E.g. the share of waste glass for glass wool production is
65 % in Ecoinvent and 0 % in Ökobau.dat.
CO2 intake of biogenic material by photosynthesis: Considered in Ökobau.dat and Baubook
Environmental credits at end of life:
o Ökobau.dat includes environmental credits e.g. the end-of-life process for wood fiber
boards is thermal waste treatment with combined heat and power generation that substitute
electrical energy (German mix) and fossil gas.
o Ecoinvent does not consider environmental credits. The recovery of energy by thermal
waste treatment is considered within the process(es) for waste treatment and improves the
energy mix.
o Baubook does not include end of life processes
Generally there are considerable differences for all insulation materials and the range and ratio of
impact data are varying for each material (figure 4):
30
20
10
0
‐10
‐20
‐30
‐40
‐50
‐60
‐70
‐80
‐90