From: GROUP MOBILE To: "MOBILE@EPAMAIL.EPA.GOV" Subject: MOBILE6 Air Conditioning documents released for Stakeholder Review and Date: Fri, 27 Mar 1998 00:44:10 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit March 13, 1998 Document Released for Stakeholder Review and Comment "Air Conditioning Correction Factors in MOBILE6" Report Number M6.ACE.002 The Office of Mobile Sources, Assessment and Modeling Division, announces the release of "Air Conditioning Correction Factors in MOBILE6" for stakeholder review and comment. This document (M6ACE002.PDF) is available at the MOBILE6 section of the OMS Web Site (http://www.epa.gov/omswww/models.htm). ABSTRACT: Revised air conditioning exhaust emission correction factors are being proposed for MOBILE6. The proposed factors are based on testing of 38 vehicles at two locations, using a test procedure meant to simulate air conditioning emission response under extreme "real world" ambient conditions. These factors are meant to predict emissions which would occur during full loading of the air conditioning system, and will be scaled down in MOBILE6 according to ambient conditions input by the user if appropriate. It was concluded that the data used in the development of the proposed factors adequately represents real world conditions, based on the results of a correlation vehicle tested at both test sites and a full environmental chamber. In general, emissions were found to increase significantly with air conditioning operation, but under some conditions HC and CO emissions decreased. For running emissions, speed-based correction factors were developed separately for Light-Duty Vehicles (LDV's) and Light-Duty Trucks (LDT's) for all pollutants; separate HC and CO corrections were also developed for high emitters. Correction factors for start driving were also assessed. Comments on this report and its proposed use in MOBILE6 should be sent to the attention of John Koupal. Comments may be submitted electronically to mobile@epamail.epa.gov, or by fax to (313)741-7939, or by mail to MOBILE6 Review Comments, US EPA Assessment and Modeling Division, 2565 Plymouth Road, Ann Arbor MI 48105. Electronic submission of comments is preferred. In your comments, please note clearly the document that you are commenting on including the report title and the code number listed. Please be sure to include your name, address, affiliation, and any other pertinent information. This document is being released and posted on March 13th. Comments will be accepted for sixty (60) days, ending May 12th. EPA will then review and consider all comments received, and will provide a summary of those comments and how we are responding to them in the form of a followup document within 30 days after the close of the comment period (June 11th). Thank you for your continuing interest in the development of MOBILE6. Sincerely, Emission Inventory Group, Assessment and Modeling Division US EPA Office of Mobile Sources