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fuels -- Predictive Model Spreadsheet Update
Posted: 05 Jan 2010 15:30:45
The Predictive Model Spreadsheet has been updated again. Changes to the spreadsheet versions that were uploaded on 12/31/09 are as follows: This spreadsheet includes a correction for an error in the CO model in the previous version of the spreadsheet. For oxygen ranges that were wider than 0.4, the model was crediting CO emissions at the minimum oxygen level for both the minimum oxygen certification and the maximum oxygen certification. So the previous PM spreadsheet was underestimating your CO emission reductions from the maximum oxygen content if your oxygen range was wider than 0.4. The second change (inadvertent) set the evaporative benzene to use the non-ethanol emission equation during the winter. This will be changed back to the way it was in the previous model, where the summer/winter trigger does not effect the evaporative benzene. Changes to the spreadsheets uploaded on 01/05/10 are as follows: The evaporative benzene portion of the model no longer uses the non-ethanol emission equation when toggling summer/winter fuel switch on to a winter fuel. This was causing discrepancies in the toxics output of the model for winter fuels. The summer/winter trigger no longer effects the evaporative benzene portion of the model. The latest versions of the Predictive Model spreadsheets can be found here: http://www.arb.ca.gov/fuels/gasoline/premodel/premodel.htm If you have any questions about the changes to the Predictive Model spreadsheets please contact Adrian Cayabyab by e-mail at acayabya@arb.ca.gov or by phone at (916) 327-1515.
