Treatment of biogenic carbon In accordance with the PCR, carbon dioxide emissions released from the combustion of woody biomass during production are considered as global warming neutral. This does not apply to other emissions associated with wood combustion such as methane or nitrogen oxides that are considered to have a global warming potential. The amount of carbon stored in wood building products in use and in landfilled wood building products is considered GHG removals in CO 2 equivalents for cradle-to-grave EPDs. GWP credit for carbon storage has been calculated using the FPInnovations PCR Carbon Sequestration B2C Calculator. Figure 3 depicts how the 100 year timeframe was applied for the GWP calculation.
Building service life - 60 yrs
1 st door service life - 40 yrs
1 st door as waste in landfill - 60 yrs
2 nd door service life - 20 yrs
2 nd door as waste in landfill - 40 yrs
FPInnovations carbon sequestration tool temporal scale (years)
0
100
Figure 3: 5-PC-ME Net Global Warming Potential (GWP) Credit Calculation
Table 1 reports the different parameters used for calculating the net GWP credit for 5-PC-ME product.
Table 1: 5-PC-ME Calculated Net GWP Credit
Calculation parameters
Quantity for 1 st door
Quantity for 2 nd door
Total per FU (2 life cycles)
Oven dry mass (kg)
42.41
42.41
-
Carbon content of wood (%)
50
50
-
Installation waste (%)
0
0
-
Product service life (years)
-
40
60 1
Waste combusted (%)
0
0
-
Waste recycled (%)
0
0
-
Waste landfilled (%)
100
100
-
Initial greenhouse gas credit (kg CO 2 eq)
-77.75
-77.75
-
17.50
14.48
31.98
Total C0 2 emissions (kg CO 2 )
0.50
0.40
0.90
Total CH 4 emissions (kg CH4)
-47.67
-53.36
-101.03
Net GWP credit (kg CO 2 eq)
1 The 2 nd door is installed in the building at year 40 and reaches its end-of-life after 20 years as the building lifetime is estimated to be 60 years.
7
Powered by FlippingBook