part_subject: "CONTROL OF EMISSIONS FROM NEW AND IN-USE HEAVY-DUTY HIGHWAY ENGINES"
subpart_code: "F"
subpart_subject: "Test Procedures"
section_number: "1036.530"
section_subject: "Calculating greenhouse gas emission rates."
cfr_reference: "40 CFR 1036.530"
title_name: "Title 40"
title_subject: "Protection of Environment"
parts_covered: "Parts 1000 to 1059"
revised_date: "Revised as of July 1, 2017"
publication_date: "As of July 1, 2017"
contains_description: "Containing a codification of documents of general applicability and future effect"
publication_info: "Published by the Office of the Federal Register National Archives and Records Administration as a Special Edition of the Federal Register"
---
This section describes how to calculate official emission results for CO2, CH4, and N2O.
(a)Calculate brake-specific emission rates for each applicable duty cycle as specified in 40 CFR 1065.650. Apply infrequent regeneration adjustment factors to your cycle-average results as described in 40 CFR 86.004-28 for CO2 starting in model year 2021. You may optionally apply infrequent regeneration adjustment factors for CH4 and N2O.
(b)Adjust CO2 emission rates calculated under paragraph (a) of this section for measured test fuel properties as specified in this paragraph (b). This adjustment is intended to make official emission results independent of differences in test fuels within a fuel type. Use good engineering judgment to develop and apply testing protocols to minimize the impact of variations in test fuels.
(2)Determine your test fuel's carbon mass fraction, w
C, as described in 40 CFR 1065.655(d), expressed to at least three decimal places; however, you must measure fuel properties rather than using the default values specified in Table 1 of 40 CFR 1065.655. Have the sample analyzed by three different labs and use the arithmetic mean of the results as your test fuel's w
C.
(3)If, over a period of time, you receive multiple fuel deliveries from a single stock batch of test fuel, you may use constant values for mass-specific energy content and carbon mass fraction, consistent with good engineering judgment. To use this provision, you must demonstrate that every subsequent delivery comes from the same stock batch and that the fuel has not been contaminated.
(4)Correct measured CO2 emission rates as follows:
(c)Your official emission result for each pollutant equals your calculated brake-specific emission rate multiplied by all applicable adjustment factors, other than the deterioration factor.