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Code of Federal Regulations Title 40. Protection of Environment § 40.1065.670 NO X intake-air humidity and temperature corrections
Current as of January 02, 2025 | Updated by Findlaw Staff
See the standard-setting part to determine if you may correct NOX emissions for the effects of intake-air humidity or temperature. Use the NOX intake-air humidity and temperature corrections specified in the standard-setting part instead of the NOX intake-air humidity correction specified in this part 1065. If the standard-setting part does not prohibit correcting NOX emissions for intake-air humidity according to this part 1065, correct NOX concentrations for intake-air humidity as described in this section. See § 1065.650(c)(1) for the proper sequence for applying the NOX intake-air humidity and temperature corrections. You may use a time-weighted mean combustion air humidity to calculate this correction if your combustion air humidity remains within a tolerance of ±0.0025 mol/mol of the mean value over the test interval. For intake-air humidity correction, use one of the following approaches:
(a) For compression-ignition engines, correct for intake-air humidity using the following equation:
Example:
xNOxuncor = 700.5 μmol/mol
xH2O = 0.022 mol/mol
xNOxcor = 700.5 · (9.953 · 0.022 + 0.832)
xNOxcor = 736.2 μmol/mol
(b) For spark-ignition engines, correct for intake-air humidity using the following equation:
Example:
xNOxuncor = 154.7 μmol/mol
xH2O = 0.022 mol/mol
xNOxcor = 154.7 · (18.840 · 0.022 + 0.68094)
xNOxcor = 169.5 μmol/mol
(c) Develop your own correction, based on good engineering judgment.
Cite this article: FindLaw.com - Code of Federal Regulations Title 40. Protection of Environment § 40.1065.670 NO X intake-air humidity and temperature corrections - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-40-protection-of-environment/cfr-sect-40-1065-670/
FindLaw Codes may not reflect the most recent version of the law in your jurisdiction. Please verify the status of the code you are researching with the state legislature before relying on it for your legal needs.
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