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gen-323.pdf

Page Number: 076

PDF Text: E. Comparisons to other emission correlations We believe that the analyses presented in this report represent the most comprehensive analyses done to date on the effects that biodiesel has on emissions of regulated pollutants. However, since we used all available and relevant data, essentially none is left with which to validate the correlation's predictive capabilities. We therefore compared our correlation's predictions to those from previous analyses conducted by other analysts. We are aware of three different previous analyses that attempted to compile data from multiple test programs and draw conclusions regarding the impact that varying biodiesel concentrations have on emissions of regulated pollutants: 1. Howell, S., "Emissions Summary for Biodiesel," MARC-IV Consulting, Inc., memorandum to Sam McCahon, December 8, 2000 2. Lindhjem et al, "Impact of Biodiesel Fuels on Air Quality," ENVIRON International Corporation Task 1 Report, June 13, 2000 3. Sheehan et al, "Life Cycle Inventory of Biodiesel and Petroleum Diesel for Use in an Urban Bus," National Renewable Energy Laboratory Final Report, May 1998 These researchers made no attempt to account for such factors as test cycle, base fuel properties, biodiesel source effects, and engine technology. Therefore, a direct comparison of the correlations developed by the above researchers to our composite correlations may not be appropriate. Instead, we compared these other correlations to our basic correlations described in Section IV.A. Figures IV.E-1, IV.E-2, IV.E-3, and IV.E-4 provide this comparison. Note that the Lindhjem report includes average biodiesel impacts at only 20 vol% and 100 vol%. The associated emission impacts were linearly interpolated for the purposes of graphical presentation. 68

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