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R-134a emissions from vehicles.

W O Siegl1, T J Wallington, M T Guenther

  • 1Research Laboratory, Ford Motor Company, Dearborn, Michigan 48121, USA. wsiegl@ford.com

Environmental Science & Technology
|March 7, 2002
PubMed
Summary
This summary is machine-generated.

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All tested vehicles leaked R-134a refrigerant from their air conditioning systems. This refrigerant leakage contributes to global warming, with vehicle servicing and disposal causing the majority of emissions.

Area of Science:

  • Environmental Science
  • Automotive Engineering
  • Atmospheric Chemistry

Background:

  • Modern vehicles utilize R-134a (hydrofluorocarbon-134a) refrigerant in air conditioning systems.
  • Refrigerant leakage from automotive AC systems is a potential source of greenhouse gas emissions.
  • Understanding R-134a emissions is crucial for assessing the environmental impact of vehicles.

Purpose of the Study:

  • To quantify R-134a refrigerant leakage from air conditioning systems in light-duty vehicles.
  • To estimate the global warming impact of R-134a emissions throughout a vehicle's lifecycle.
  • To assess the contribution of R-134a leakage to overall vehicle-related climate change impact.

Main Methods:

  • Tested 28 light-duty vehicles from five manufacturers using the EPA's extended diurnal test procedure and a Sealed Housing for Evaporative Determination (SHED) apparatus.

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  • Measured R-134a leakage using gas chromatography (GC) with a flame ionization detector (FID) under stationary conditions with AC systems off.
  • Calculated leak rates and estimated lifetime average emission rates, incorporating data from vehicle operation, servicing, and disposal.

    • Main Results:

    • All vehicles exhibited measurable R-134a leakage, with leak rates ranging from 0.01 to 0.36 g/day (average 0.07 g/day).
    • Estimated lifetime average R-134a emission rate was 0.41 g/day, with most emissions linked to servicing and disposal.
    • Global warming impact of R-134a leakage is estimated at 4-5% of the CO2 emissions from an average vehicle.

    Conclusions:

    • R-134a refrigerant leakage from automotive AC systems is a consistent finding across modern vehicles.
    • Vehicle servicing and disposal are significant contributors to total R-134a emissions.
    • R-134a leakage represents a notable, though secondary, contribution to the overall global warming impact of vehicles compared to CO2 emissions.