Environmental Engineering Reference
In-Depth Information
Biodiesel has the closest energy density to petroleum fuels, with butanol the next closest. For the
gaseous fuels (hydrogen and CH
4
), although high in energy on a gravimetric basis, the volumetric
energy density is low even at high pressures. Significant advancements in storage will be required
to match the energy density of the liquid fuels. Furthermore, fuels such as biodiesel and DME are
better suited to CI engines, whereas other fuels such as ethanol and gaseous fuels are better suited
to SI engines. Even so, it is difficult to take full advantage of biofuels such as ethanol with a high
octane rating when designing a FFV because many design parameters have to be specified for the
“worse-case” fuel mixture in the vehicle tank.
reFerences
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ASTM (2010)
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,
Designation D6751-10, American Society for Testing and Materials, West Conshohocken, PA
ASTM (2010)
Standard Specifications for Diesel Fuel Oils
, Designation D975-10a, American Society for
Testing and Materials, West Conshohocken, PA
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