Presentation: 2003-07-03 SORE Workshop - Inventory Presentation

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Presentation: 2003-07-03 SORE Workshop - Inventory Presentation Powered By Docstoc
					  Proposed Control Measure to Reduce Emissions
      from Small Off-Road Engines (SORE)
Mobile Source Control Division            July 2, 2003
Planning and Technical Support Division   Public Workshop
Monitoring and Laboratory Division
California Air Resources Board
 Overview of Emission Inventory Update


• Update SORE exhaust inventory
• Update lawn and garden (L&G)
  population and activity estimates
• Impact of updates
• Addition of SORE evaporative
  emission inventory



             California Air Resources Board
               Data Source


• Estimates of population and activity
  last updated in 1998
• New estimates based upon usage and
  population survey conducted by the
  ARB




            California Air Resources Board
       Lawn and Garden Survey


• Grant from US EPA to obtain usage
  and population estimates of L&G
  equipment
• 1000 surveys/month for 15 months
• Randomly selected households from
  three broad regions of the state
  (Northern, Southern, and Central
  California)

           California Air Resources Board
         Survey Questionnaire


• Type of dwelling
• Information about equipment owned
  (such as equipment type,number and
  fuel type)




           California Air Resources Board
            Survey Responses


• 2169 completed residential surveys
• Response rate of 14%
• Majority were single family dwellings
  (74%)
• Equipment fuel type :
  61% Gas 39% Electric, 12% Diesel



             California Air Resources Board
        New Population Estimates

• Based on US Census 2000 data,
  California household = 11,502,870
• Expanded survey results to obtain
  gasoline equipment population
• New estimate of 11.6 million pieces of
  residential, gasoline powered L&G
  equipment compared to current
  estimate of 4.5 million units
  – 1 piece of equipment per household
             California Air Resources Board
         New Activity Estimate


• Subset of survey respondents
  participated in usage study
• 224 event loggers were installed on
  various equipment for approx. 2 weeks
• Event logger provided date and time
  stamp data of the equipment used
• Annual activity estimates were revised
  based on this data

            California Air Resources Board
Impact on SORE Exhaust Emission Inventory
Residential plus Commercial L&G Equipment
         Year 2000, Baseline, State

                          Pop          HC        CO         NOX    PM

       Baseline        4,960,147     49.96     346.18       2.15   0.91

       New Pop/Act     13,204,786    123.19    898.47       5.75   3.34

       Change (tons)                 76.23     552.29       3.60   2.43

       % Diff.           166%        162%       160%        167%   267%
267%




                           California Air Resources Board
          More Information
• For more detailed information, go to
  website :
  http://www.arb.ca.gov/msprog/offroad/
  sore/sore.htm

• Document : Off-Road Modeling
  Change Technical Memo - Change in
  Population and Activity Factors for
  Lawn and Garden Equipment

           California Air Resources Board
       Evaporative Emissions

               Definition
• Hot Soak - occurs immediately after
  engine is turned off
• Diurnal - occurs when ambient
  temperature rises
• Resting Loss - occurs when ambient
  temperature declines (mainly
  permeation)
• Running Loss - occurs while
  equipment is being operated
          California Air Resources Board
                Data Source


• Emission factors from testing done at
  ARB and Automotive Testing
  Laboratory (ATL)
• Use of SHED when equipment was
  tested
• Episodic summertime temperature
  profile (65-105F) with 7 RVP fuel used
  for baseline diurnal/resting loss testing

             California Air Resources Board
Equipment Tested (Baseline)

•   Lawnmower          23
•   Trimmer            8
•   Leafblower         3
•   Chainsaw           3
•   Tractor            4
•   Generator          4
•   Tiller             1

       California Air Resources Board
                 Equations


• Hot Soak (tpd) = Pop * Percent Usage
  * Emission Factor * RVP Correction
• Diurnal/Resting = Pop * Emission Rate
  * Temp/RVP Correction
• Running Loss = Pop * Percent Usage *
  Activity * Emission Rate * RVP
  Correction



            California Air Resources Board
        Emission Rate Definition


• Emission Factor = zero hour rate +
  (deterioration rate)*(cumulative hours)
• Zero hour is based on new engine test
  data
• Deterioration rate is based on in-use
  engine test data




             California Air Resources Board
               Proposed Control Measure

Equipment Type         Control                          Implementation


Handheld               30% reduction diurnal/resting  2005
                       50% reduction hot soak/running

Non-Handheld Class I  1.0 g/day diurnal/resting         2006 Lawnmower
(65-225cc)            70% reduction hot soak            2007 Other
                      50% reduction running
Non-Handheld Class II 2.0 g/day diurnal/resting         2008
(>225cc)              70% reduction hot soak
                      50% reduction running




                       California Air Resources Board
          Example of Lawnmower Diurnal/Resting
           Baseline vs. Control Emission Factors

                       Baseline                 Controlled

          15.000

          10.000
(g/day)




           5.000

           0.000
                   0        5 Age, years 10                  15

                       California Air Resources Board
  Example of Lawnmower Exhaust
Baseline vs. Control Emission Factors
                   16.00

                   14.00

                   12.00
HC+NOx, g/bhp-hr




                   10.00

                                                                  Baseline
                    8.00
                                                                  6/4.5
                    6.00

                    4.00

                    2.00

                    0.00
                           0   100      200       300       400
                                        Hour




                               California Air Resources Board
       SORE Evaporative Emission Inventory
                Year 2020, State


                          Non-                Non-
                       Preempted           Preempted
                       Handheld               Non-
                                           Handheld
       Baseline            5.95              44.92

       Control             3.85                14.95
267%




                  California Air Resources Board
          More Information
• For more detailed information, go to
  website :
  http://www.arb.ca.gov/msprog/offroad/
  sore/sore.htm

• Document : Off-Road Modeling
  Change Technical Memo - Addition of
  Evaporative Emissions for Small Off-
  Road Engines

           California Air Resources Board

				
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