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ACRP Web-Only Document 41: Alternative Jet Fuels Emissions: Quantification Methods Creation and Validation Report (2019) / Chapter Skim
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Pages 44-54

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From page 44...
... Emissions Quantification Methodology Report: ACRP 02-80 Quantifying Emissions Reductions at Airports from the Use of Alternative Jet Fuel Emissions Quantification Methodology Report Page 44 6.0 Guidance to Use SAJF Impact Factors for Emissions Inventory and Dispersion Modeling at Airports 6.1 Guidance to Account for SAJF Impacts on Airport Emissions Inventory This section describes the method to adjust an airport emission inventory using the impact quantification factor functions to estimate the impact of SAJF blend percentages at airports. The pollutant-specific analysis described in section 4 show SAJF blend percentage as the only critical factor in determining the impact of use of SAJF at airports.
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From page 45...
... Emissions Quantification Methodology Report: ACRP 02-80 Quantifying Emissions Reductions at Airports from the Use of Alternative Jet Fuel Emissions Quantification Methodology Report Page 45 Figure 13: Overview of the process to compute the impact of SAJF on airport emissions inventory 6.2 Instructions to Segregate Piston and Non-Piston Aircraft Operations in AEDT The impact quantification factors only apply to emissions from non-piston operations, therefore it is recommended to segregate non-piston operations and piston operations before modeling the airport inventory emissions. This section describes the process to segregate non-piston and piston operations into separate groups (i.e.
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From page 46...
... Emissions Quantification Methodology Report: ACRP 02-80 Quantifying Emissions Reductions at Airports from the Use of Alternative Jet Fuel Emissions Quantification Methodology Report Page 46 Figure 14: Example of an operations list with piston aircraft have "User ID" starting with a "P" and non-piston with "NP" 2. Click on Annualizations button in the Display ribbon and click on the New button in the Annualization Actions button 3.
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From page 47...
... Emissions Quantification Methodology Report: ACRP 02-80 Quantifying Emissions Reductions at Airports from the Use of Alternative Jet Fuel Emissions Quantification Methodology Report Page 47 Figure 15: Example showing the use of "User ID" filter to select and group piston and non-piston aircraft operations Figure 16: Example showing method to drag selected operations to the corresponding operations group
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From page 48...
... Emissions Quantification Methodology Report: ACRP 02-80 Quantifying Emissions Reductions at Airports from the Use of Alternative Jet Fuel Emissions Quantification Methodology Report Page 48 6. On the next page move the operations groups to "Root" in the "Assigned annualization window" using the select and drag feature and click next.
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From page 49...
... Emissions Quantification Methodology Report: ACRP 02-80 Quantifying Emissions Reductions at Airports from the Use of Alternative Jet Fuel Emissions Quantification Methodology Report Page 49 Figure 18: Screenshot showing the annualization created Once the metric is run, the user can view the results in the Reports tab by selecting the metric and then clicking on Emissions and Fuel button in the Reports ribbon. The user can generate the emission inventory report for each aircraft operations group (piston and non-piston)
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From page 50...
... Emissions Quantification Methodology Report: ACRP 02-80 Quantifying Emissions Reductions at Airports from the Use of Alternative Jet Fuel Emissions Quantification Methodology Report Page 50 Figure 20: Example showing results for piston aircraft operation group Figure 21: Example showing results for non-piston aircraft operation group 6.3 Guidance to Account for Impact of SAJF on Emission Dispersion at Airports The SAJF impact factors apply only to non-piston operations and in case of emission inventory, the SAJF impact factors can be applied to non-piston emissions as a post-process. As described in the previous section, the emission inventory can be conducted with piston and non-piston operations as separate cases
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From page 51...
... Emissions Quantification Methodology Report: ACRP 02-80 Quantifying Emissions Reductions at Airports from the Use of Alternative Jet Fuel Emissions Quantification Methodology Report Page 51 in the study scenario, which then calculates the total baseline emissions inventory for each case separately to apply the post-process methodology. Unlike emissions inventory, the emissions dispersion, which is expressed as pollutant concentration (Β΅g/mΒ³)
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From page 52...
... Emissions Quantification Methodology Report: ACRP 02-80 Quantifying Emissions Reductions at Airports from the Use of Alternative Jet Fuel Emissions Quantification Methodology Report Page 52 STEP 5 – Compute the impact of SAJF on the total airport emissions dispersion at each receptor using the total adjusted emissions dispersion and the total baseline emissions dispersion, as shown below: 𝑆𝐴𝐽𝐹 πΌπ‘šπ‘π‘Žπ‘π‘‘ = 𝐴𝑑𝑗𝑒𝑠𝑑𝑒𝑑 πΈπ‘šπ‘–π‘ π‘ π‘–π‘œπ‘›π‘  π·π‘–π‘ π‘π‘’π‘Ÿπ‘ π‘–π‘œπ‘›π΅π‘Žπ‘ π‘’π‘™π‘–π‘›π‘’ πΈπ‘šπ‘–π‘ π‘ π‘–π‘œπ‘›π‘  π·π‘–π‘ π‘π‘’π‘Ÿπ‘ π‘–π‘œπ‘› βˆ’ 1 6.3.2 Guidance to Account for Impact of SAJF on Emission Dispersion at Airports with Piston and Non-Piston Operations There are two potential methods to account for impact of SAJF in emissions dispersion calculations at airports with both piston and non-piston operations. The first is the post-process method which involves the following steps: STEP 1 – Determine SAJF blend percentage for which the impact needs to be estimated.
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From page 53...
... Emissions Quantification Methodology Report: ACRP 02-80 Quantifying Emissions Reductions at Airports from the Use of Alternative Jet Fuel Emissions Quantification Methodology Report Page 53 STEP 7 – Compute the total baseline emissions dispersion concentration at the receptors as the sum of the baseline emissions dispersion concentrations for piston operations and the baseline emissions dispersion concentration for non-piston operations (from step 4)
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From page 54...
... Emissions Quantification Methodology Report: ACRP 02-80 Quantifying Emissions Reductions at Airports from the Use of Alternative Jet Fuel Emissions Quantification Methodology Report Page 54 𝑆𝐴𝐽𝐹 πΌπ‘šπ‘π‘Žπ‘π‘‘ = π‘€π‘œπ‘‘π‘–π‘“π‘–π‘’π‘‘ πΈπ‘šπ‘–π‘ π‘ π‘–π‘œπ‘›π‘  π·π‘–π‘ π‘π‘’π‘Ÿπ‘ π‘–π‘œπ‘›π΅π‘Žπ‘ π‘’π‘™π‘–π‘›π‘’ πΈπ‘šπ‘–π‘ π‘ π‘–π‘œπ‘›π‘  π·π‘–π‘ π‘π‘’π‘Ÿπ‘ π‘–π‘œπ‘› βˆ’ 1 Note: Although SAJF use impacts nvPM emissions, the impact on nvPM emissions dispersion concentrations cannot be computed using the method described above. As mentioned before, the emissions dispersion tool only model emissions dispersion for total PM (10 and 2.5)
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