3.3.10           Weighing category Greenhouse-effect

Greenhouse-effective gases contribute to the heating of the earth and to the climate change. The largest part of the greenhouse effect is formed by the natural greenhouse gases carbon dioxide and water vapor. But methane and other trace gases like nitrogen oxides and fluorinated hydrocarbons with, among other things, anthropogenic origin, are greenhouse-effective on their parts. The global warming potential (GWP) is expressed in carbon dioxide-equivalents; . In Table 13, the specific weighting factors Q concerning the greenhouse-effect are compiled.

 

Table 13     Assignment of global warming potentials (GWP) to the weighting factor QGreenhouse effect

Q

 

GWP [CO2 := 1]

 

1

0.00

to

1.00

2

1.00

to

2.96

3

2.96

to

8.77

4

8.77

to

25.98

5

25.98

to

76.96

6

76.96

to

227.93

7

227.93

to

675.09

8

675.09

to

1999.48

9

1999.48

to

5922.08

10

5922.08

to

<

           

The coordinates (Q = 2 / GWP = 1 (CO2-equivalent) and (Q = 9 / GWP = 2000 (CO2-equivalents) yield the exponential function GWP = 0.114 × e1.0858×Q, wherefrom the weighting factor Q at a given GWP is calculated: Q = [ln(GWP / 0.114) / 1.0858)].

Essentially, greenhouse gases produced for the energy supply make an impact on the greenhouse effect of a process. Possibly liberated CO2 or N2O from a synthesis itself substantially is of less importance. Therefore, the weighting category is provided especially for data from the energy supply.

 

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