ANNEX VIIIMeasurement-based methodologies (Article 41)

1.Tier definitions for measurement-based methodologies

Measurement-based methodologies shall be approved in accordance with tiers with the following maximum permissible uncertainties for the annual average hourly emissions calculated in accordance with Equation 2 set out in section 3 of this Annex.

Table 1Tiers for CEMS (maximum permissible uncertainty for each tier)

Tier 1

Tier 2

Tier 3

Tier 4

CO2 emission sources

± 10 %

± 7,5 %

± 5 %

± 2,5 %

N2O emission sources

± 10 %

± 7,5 %

± 5 %

N.A.

CO2 transfer

± 10 %

± 7,5 %

± 5 %

± 2,5 %

2.Minimum requirements

Table 2Minimum requirements for measurement-based methodologies

Greenhouse gas

Minimum tier level required

Category A

Category B

Category C

CO2

2

2

3

N2O

2

2

3

3.Determination of GHGs using measurement-based methodologies

Equation 1:Calculation of Annual Emissions

GHGtot annt=∑i=1operating hours p.a.GHG conc hourly i * flue gas flowi * 10− 6t∕gmath

Where:

GHG conchourly

hourly concentrations of emissions in g/Nm3 in the flue gas flow measured during operation;

Flue gas flow

flue gas flow in Nm3 for each hour.

Equation 2:Determination of average hourly concentrations

GHG emissions av hourlykg∕h=∑ GHG concentration hourlyg∕Nm3 * flue gas flowNm3∕ hHours of operation* 1000math

Where:

GHG emissionsav hourly

annual average hourly emissions in kg/h from the source;

GHG conchourly

hourly concentrations of emissions in g/Nm3 in the flue gas flow measured during operation;

Flue gas flow

flue gas flow in Nm3 for each hour.

4.Calculation of the concentration using indirect concentration measurement

Equation 3:Calculation of the concentration

GHG concentration%= 100 % −∑i Concentration of componenti%math

5.Substitution for missing concentration data for measurement-based methodologies

Equation 4:Substitution for missing data for measurement-based methodologies

C*subst=C–+2σC _math

Where:

C–math

the arithmetic mean of the concentration of the specific parameter over the whole reporting period or, where specific circumstances applied when data loss occurred, an appropriate period reflecting the specific circumstances;

σC_

the best estimate of the standard deviation of the concentration of the specific parameter over the whole reporting or, where specific circumstances applied when data loss occurred, an appropriate period reflecting the specific circumstances.