Economia
& Energia 
English Version 
Energy Demand for the Domestic Sector Emission of Greenhouse Effect Gases in the Domestic Sector e&e’s methodology for the Energy Matrix Projection Emission Coefficients Matrix Calculation e&e
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COEFFICIENTS OF THE EMISSION MATRIX PROJECT: SUPPLY OF AN INSTRUMENT FOR
ESTIMATING THE EMISSION OF GREENHOUSE EFFECT GASES COUPLED WITH THE ENERGY
MATRIX” AGREEMENT
MINISTRY OF SCIENCE AND TECHNOLOGY Introduction In order to obtain the emission matrix from the energy matrix extrapolation it is necessary to choose coefficients that permit to infer the emission corresponding to fuel consumption in final energy. As a first approximation, the coefficients used by the Intergovernmental Panel on Climate Change – IPCC, revision 1996, will be used. Whenever possible, values that are more appropriate to the Brazilian conditions will be adopted, namely those originating from studies concerning the national inventory and projections concerning new technologies. Methodology This work presents the methodology used for estimating the greenhouse effect gases emission matrix originating from fuel combustion in the various economy sectors. The objective is to obtain a coefficient to be multiplied by the fuel consumption of each energy source in a specific sector of the economy in order to have the emitted quantity of each of the greenhouse effect gases. The IPCC methodology separates the calculation of greenhouse effect gases in the following way:  CO2 emission from the fuel carbon content;  CH4, N2O, NOx and CO from the consumption of each fuel source organized according to the economy sector; 
SO2 emission from the sulfur content in the fuel and in its ashes. We describe below the steps followed in the emission coefficients calculation. I) CO2 coefficients 1)conversion to terajoule The conversion factor is A= 41,868 TJ/103 tep 2) multiplication by the emission factor in order to calculate the carbon content The IPCC supplies the emission factors (in tons of C/TJ) for primary and secondary liquid fuel, primary and secondary solid fuel, natural gas and solid, liquid and gaseous biomass. B = emission factor for the fuel in question 3) correction for nonoxidised carbon Fraction of oxidised carbon
C = fraction of oxidised carbon of the energy source 4)conversion from oxidised carbon to CO2 emission Multiplying the conversion factor by the emission factor of the fuel in question (times 103 in order to have Gg of C/TJ) and by the corresponding fraction of oxidised carbon, we will have the carbon emission coefficient in Gg/103 tep of fuel. In order to obtain the CO2 emission coefficient it is sufficient to multiply the above coefficient by 44/12. CO2 emission coefficient = A*B*C*44/12 (Gg of CO2/103 tep) 2) CH4, N2O, NOx and CO coefficients The
IPCC supplies the emission factors for the above mentioned gases, for the
following fuels and economy sectors (inn kg/TJ): 1) conversion to terajoule The conversion factor is A= 41,868 TJ/103 tep 2) multiplication by the emission factor (of the respective gas) for the economy sector and for the fuel in question B = emission factor for the fuel in question and for the specific economy sector Multiplying the emission factor (times 106 to have Gg of the gas /TJ) we will have the emission factor for the respective gas in Gg/103 tep) Emission coefficient (of the respective gas) = A B*10 6 (Gg / 10 3 tep) III) SO2 coefficient1) conversion to terajoule The conversion factor is A= 41,868 TJ/103 tep 2) calculation of the SO2 emission factor 3) B= 2* [(%sulfur content/100)]*[1/ net calorific value]*[(100%sulfur retention in ash)/100. The IPCC supplies the net calorific value for different energy sources in TJ/103 t. SO2 emission coefficient = A*B* (Gg/103 tep) Note: The sulfur content of natural gas is given in g/cm3 and the net calorific value should be given in kJ/m3. The sulfur content in natural gas should not be divided by 100 in the calculation of B. ResultsThe attached spreadsheets show the preliminary values to be used.. 