Analysis for Recovering Energy from Industrial Waste Heat

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Analysis for Recovering Energy from Industrial Waste Heat ( analysis-recovering-energy-from-industrial-waste-heat )

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B APPENDIX B: CALCULATION OF METHANE EMISSIONS FROM VARIOUS TECHNIQUES Other Manufacturing CO2 Emissions Fuel Petroleum 10.4 Natural gas 59.7 Coal 10 Other 1.5 81.6 % Quads Energy Used 12.7 0.19 73.2 1.08 12.3 0.18 1.8 0.03 100.0 1.48 GJ Used 199011704.3 1142403726 191357408 28703611.2 1561476449 CH4 EMF g/GJ* Gg CH4 0.38 5.14 1.82 0.77 8.11 Total 57.06 24.62 18.73 13.71 5.29 6.23 8.11 133.75 2 5 10 30.0 Summary Table of Methane Emissions Gg for Year 1998 Industry SIC Fuel Code Petroleum Natural Coal Gas 5.58 0 13.23 5.88 3.34 13.86 4.44 7.77 2.53 2.28 1.64 4.10 Other 43.74 3.04 1.42 0.69 0.38 0.29 0.77 50.34 Petroleum 29 7.74 Chemicals 28 2.47 Metals 33 0.11 Paper 26 0.81 Food 20 0.10 Glass 32 0.20 Other manufacturing no code 0.38 5.14 1.82 11.80 35.89 35.71 The above results were obtained from using CO2 emission coefficient to determine energy consumed by each industry. The CO2 emission from electricity generation within each SIC code was available. This value was used to estimate the energy associated with electricity generation. The energy associated with electricity generation was subtracted from the total energy consumed within each sector. The CO2 emission data for each fuel type within each industry was used to calculate the energy related with that emission. This could have been done using the CO2 emissions coefficient for the particular industry. However, this emission coefficient is a function of fuel type used. In order to keep things simple, the energy associated with each fuel type within an industry was assumed to be proportional to CO2 generation. *Source: Lisa Hanle, U.S. Environmental Protection Agency, Washington, D.C. The values for 1990, 1995, and 2001 were calculated using CO2 emission data for these years (Table 8 of [2]), assuming an average CO2 emission coefficient to calculate the fuel consumption, and then using the CH4 emission coefficient to determine CH4 emissions. The average CO2 emission coefficient was calculated by weighting the CO2 emission coefficient for each sector with the CO2 emission data for each sector in the Year 1998 (the only year for which this data was available) from p. 20 of the same report. As a check, the CH4 emissions for year 1998 was 100 GJ, while the result using actual data for year 1998 was 133 GJ. This discrepancy is due to the errors associated with the estimation of the CO2 emission coefficient. 95

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