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Emissions Analysis

Photo of researcher weighing a clean particulate filter.

Emissions that result in pollution from engines are strictly regulated. The next generation of heavy-duty diesel engines will be the cleanest by far. Some advanced fuels can reduce these emission levels even further.

In order to accurately measure emissions at these very low levels, the ReFUEL Laboratory features an advanced emission measurement system with supplemental air and fuel conditioning to ensure repeatability. This system is based on the full-scale dilution tunnel method with a constant velocity sampling system for mass-flow measurements.

Emissions Measurement Capabilities

Photo of NREL's emissions measurement lab.

The following emissions measurement capabilities support the chassis dynamometer and engine dynamometer functions at the ReFUEL Laboratory:

  • Continuous measurement of gaseous emissions of total hydrocarbons, oxides of nitrogen, carbon monoxide, carbon dioxide, ammonia, and nitrous oxide via in-lab emissions benches and a portable emissions measurement system
  • Particulate matter measurements
    • Ultra-micro balance: 0.1 µg readability
    • Particle size measurement range: 5.6 – 560 nm
    • Class 1000 clean room/environmental chamber with precise temperature and humidity control
    • Active vibration and static mitigation.
  • Additional, unregulated emissions measurements
    • Carbonyls, aldehydes, and ketones
    • Hydrocarbon speciation (C1–C12).

Although the ReFUEL Laboratory does not offer certification services, the facility follows 2007 Code of Federal Regulations emissions requirements, which are still applicable today.

To learn more about NREL emissions analysis projects, visit the Data and Resources page.