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Potential Impacts of CF3I on Ozone as a Replacement for CF3BR in Aircraft Applications.


pdf icon Potential Impacts of CF3I on Ozone as a Replacement for CF3BR in Aircraft Applications. (663 K)
Li, Y.; Wuebbles, D. J.

Paper 05; HOTWC 2005;

Halon Options Technical Working Conference, 15th Proceedings. HOTWC 2005. Sponsored by: 3M Specialty Materials, Boeing, Chemical Development Studies, Inc., DuPont Fire Extinguishants, Halon Alternative Research Corp., Hughes Associates, Inc., Kidde-Fenwal, Inc., Sandia National Laboratories, SEVO Systems, Next Generation Fire Suppression Technology Program. May 24-26, 2005, Albuquerque, NM, 1-8 pp, 2005.

Sponsor:

National Institute of Standards and Technology, Gaithersburg, MD

Keywords:

halon alternatives; halons; halon 1301; ozone; aircraft fuels; fire fighting; emissions; inerting; nacelle engines; military aircraft; sensitivity analysis; fire extinguishing agents; chemical reactions; iodine; aircraft engines; thermal reactions

Abstract:

CF3I has been considered to be a candidate replacement of CF3Br used in aircraft for fuel inerting and for fire fighting. In this study, the chemical effects of aircraft released CF3I on atmospheric ozone were examined with the current UIUC 2D Chemical Transport Model (CTM). Using the former estimate of aircraft emission profile for tank inerting in military aircraft as used in the resulting equivalent ODPs for CF3I were in the range of 0.07 to 0.25, above the critical value 0.05, the U.S. EPA for policy consideration. As a sensitivity analysis, we analyzed a case with emissions associated with inerting occurring at lower altitudes. This case resulted in much lower ODPs. Finally, we analyzed the potential effects on ozone resulting from using CF3I in fire fighting connected with engine nacelle and auxiliary power unit applications. The resulting effects on ozone showed extremely low ODPs < 0.05. The altitudes where most of aircraft released CF3I occurs seemed to be a dominant factor in its ozone depletion effects.