National Academies Press: OpenBook
« Previous: Table of Contents
Page 6
Suggested Citation:"1.0 Introduction." National Academies of Sciences, Engineering, and Medicine. 2019. ACRP Web-Only Document 41: Alternative Jet Fuels Emissions: Quantification Methods Creation and Validation Report. Washington, DC: The National Academies Press. doi: 10.17226/25548.
×
Page 6

Below is the uncorrected machine-read text of this chapter, intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text of each book. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

Emissions Quantification Methodology Report: ACRP 02-80 Quantifying Emissions Reductions at Airports from the Use of Alternative Jet Fuel Emissions Quantification Methodology Report Page 6 1.0 Introduction One of the most challenging environmental issues facing the aviation industry today is the impact of jet fuel emissions on the global climate. As a result, airlines throughout the world have committed to reducing their emissions-driven climate impacts. The primary means for reducing these impacts over the long term is through use of sustainable alternative jet fuels (SAJF) produced from non-petroleum sources, which reduce life-cycle greenhouse gas (GHG) emissions. Emissions testing conducted to date shows that, in addition to reducing life-cycle GHG emissions, SAJF also impacts emissions of other pollutants. Sulfur oxides (SOx) and particulate matter (nvPM) emission reductions are particularly significant. Emissions of other air quality pollutants including carbon monoxide (CO), unburned hydrocarbons (UHC), hazardous air pollutants (HAP), and nitrogen oxides (NOx) are also reduced, to a lesser extent, or at least do not increase. These additional emissions benefits may be highly valued by airports. The air quality emissions reductions from SAJF use could become an important component of airlines’ commitment to supporting airports’ sustainability goals. These benefits could improve relations with airport workers and the communities near airports that may be concerned with local air quality or could give airports flexibility to grow under State Implementation Plan (SIP) constraints. For these reasons, use of SAJF to reduce aircraft emissions will become significantly more important in coming years. Capturing the air quality benefits in a way that is useful to airports requires understanding how SAJF reduce pollutant emissions, quantifying the reduction, and demonstrating the impact through an easy-to-use tool that airports can apply to their emissions inventories. This document is organized as follows. Section 2 describes the emissions impact quantification methodology. Section 3 summarizes the impact quantification factor, uncertainty functions, sample impact factors, and uncertainties at 50% SAJF blend. Section 4 describes in detail the pollutant-specific analysis used to develop the impact quantification factor and uncertainty functions. Section 5 describes the results of the airport emissions inventory impact analysis which estimates the reduction in pollutant species across airports with different characteristics in terms of size and operations mix. Section 6 provides guidance to use SAJF impact factors for emissions inventory and dispersion modeling at airports. Section 7 summarizes all available emissions data. Section 8 provides instructions to use the Alternative Jet Fuel Assessment Tool PATH TO IMPACT FACTOR QUANTIFICATION • Primary metrics included engine type, engine operating condition, fuel composition, blend percentages, atmospheric conditions, etc. • The tabulated data revealed that in many cases the engine specific emissions may be dependent on three primary metrics: fuel composition, engine power, and fuel type. • There was insufficient data to allow the fuel composition or engine-fuel-power specific dependency to be parameterized with any statistical significance. • The power complexity was addressed by developing a weighted average impact based on the ICAO LTO cycle fuel burn values. • The ICAO LTO cycle was designed to capture normal aircraft/airport operations, and hence can be used to normalize typical power usage. • The fuel-type and engine-type complexities were addressed by incorporating them into the uncertainty analysis accompanying the impact factor quantification.

Next: 2.0 Emissions Impact Quantification Methodology »
ACRP Web-Only Document 41: Alternative Jet Fuels Emissions: Quantification Methods Creation and Validation Report Get This Book
×
MyNAP members save 10% online.
Login or Register to save!
Download Free PDF

One of the most challenging environmental issues facing the aviation industry today is the impact of jet fuel emissions on the global climate. The use of sustainable alternative jet fuels (SAJF) to reduce aircraft emissions will become significantly more important in coming years. Capturing the air quality benefits in a way that is useful to airports requires understanding how SAJF reduce pollutant emissions, quantifying the reduction, and demonstrating the impact through an easy-to-use tool that airports can apply to their emissions inventories.

ACRP Web-Only Document 41: Alternative Jet Fuels Emissions: Quantification Methods Creation and Validation Report represents the second phase of this ACRP work. The first phase provided an understanding of how SAJF impacts aircraft emissions. This phase analyzes the data compiled in the report to quantify SAJF emission impacts.

Results of this analysis were subsequently used to develop a simplified tool that will allow airports to easily estimate emission reductions from use of SAJF at their airport. The Alternative Jet Fuel Assessment Tool and the Sustainable Alternative Jet Fuels and Emissions Reduction Fact Sheet are the two key products from ACRP 02-80.

  1. ×

    Welcome to OpenBook!

    You're looking at OpenBook, NAP.edu's online reading room since 1999. Based on feedback from you, our users, we've made some improvements that make it easier than ever to read thousands of publications on our website.

    Do you want to take a quick tour of the OpenBook's features?

    No Thanks Take a Tour »
  2. ×

    Show this book's table of contents, where you can jump to any chapter by name.

    « Back Next »
  3. ×

    ...or use these buttons to go back to the previous chapter or skip to the next one.

    « Back Next »
  4. ×

    Jump up to the previous page or down to the next one. Also, you can type in a page number and press Enter to go directly to that page in the book.

    « Back Next »
  5. ×

    To search the entire text of this book, type in your search term here and press Enter.

    « Back Next »
  6. ×

    Share a link to this book page on your preferred social network or via email.

    « Back Next »
  7. ×

    View our suggested citation for this chapter.

    « Back Next »
  8. ×

    Ready to take your reading offline? Click here to buy this book in print or download it as a free PDF, if available.

    « Back Next »
Stay Connected!