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Alternative Correction Factor for the Effects of Inlet Air Humidity on NOx From an Emissions Regulated Four-Stroke Medium Speed Diesel Engine and Comparison With Other Known Factors

[+] Author Affiliations
W. Doug Glenn

General Electric - Rail, Erie, PA

Paper No. ICEF2005-1108, pp. 139-144; 6 pages
  • ASME 2005 Internal Combustion Engine Division Fall Technical Conference
  • ASME 2005 Internal Combustion Engine Division Fall Technical Conference (ICEF2005)
  • Ottawa, Ontario, Canada, September 11–14, 2005
  • Conference Sponsors: Internal Combustion Engine Division
  • ISBN: 0-7918-4736-5 | eISBN: 0-7918-3768-8
  • Copyright © 2005 by ASME


With increasingly stringent emissions regulations for NOx and the known tradeoff of fuel consumption with NOx, ensuring the use of appropriate correction factors becomes increasingly significant to the OEM and customer. The Environmental Protection Agency (EPA) has specified in 40CFR Part92 that locomotive engines shall use a NOx correction factor, KNOx = f(KH ), where KH is the humidity correction factor. This paper will present an alternative NOx humidity correction factor for GE Rail 4-stroke medium speed diesel engines. GE Rail’s NOx humidity correction factor will be compared with five other correction factors in a numerical exercise to assess the sensitivity to variations in ambient temperature, ambient pressure, relative humidity and A:F ratio. GE Rail’s alternative correction factor provides a 25% reduction in Line Haul Duty Cycle BSNOx variation and a mean BSNOx reduction of 3% as compared with KNOx correction factor from Part92.

Copyright © 2005 by ASME



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