CMAQ Emissions Calculator Toolkit: On-Road Diesel Repower or Replacement
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CMAQ Emissions Calculator Toolkit: On-Road Diesel Repower or Replacement

Filetype[PDF-1011.87 KB]


  • English
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    • Corporate Creators:
      Federal Highway Administration (U.S.)
    • Subject/TRT Terms:
    • Resource Type:
      Manual
    • Geographical Coverage:
      United States
    • Corporate Publisher:
      Federal Highway Administration (U.S.)
    • Abstract:
      The diesel repower/replacement project emission reductions calculator estimates emission reductions for repowering/replacing heavy-duty diesel vehicles (excluding transit vehicles) of a given model year with a newer diesel vehicle of a more recent model year. 1 Emission reductions are estimated by calculating the reduction in both running and starts emissions, as well as, if applicable, extended idling emissions (referred hereafter as hotelling hours) and comparing it to the emissions from the replacement engines or vehicles. This document is organized into three sections – User Guide, Tool Methodology, and Examples – to aid the user in understanding and interpreting results from the calculator. The User Guide gives direction for the user to properly input values into the tool and provides definitions of both user inputs and tool outputs. The Tool Methodology outlines the steps taken by the tool to calculate emission reductions, as well as any assumptions that are made by the tool. This Tool Methodology includes all equations used within the tool. The Examples section aims to give some examples of how to properly input information into the tool, including some examples for use with the optional Activity Calculator, for advanced analysis.
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    Version 3.26