
691Diesel Engines
turbocharged engines, it may be advantageous to install
the membrane module before the compressor. This will
avoid the energy loss associated with compressing and
discarding part of the nitrogen content of air. Such are
the design criteria.
106
Stork and Poola
94
have conducted a
benet and cost-assessment study for the U.S. Department
of Energy addressing membrane-based air separation for
diesel vehicles. They estimated that such systems to meet
engine emission standards of 0.01 g/mi PM may need to
supply 23% oxygen-enriched air. A ow rate of 100 cfm
(2832 lpm) of such enriched air can be supplied by hollow
ber membrane mod ...