April 2016
Intermediate to advanced
548 pages
19h 23m
English
Content preview from Ecological Sustainability
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187Mitigations of Human Impacts through Technology
The FC was a unique Flat Stack design, which allowed the FC to be inte-
grated with the aerodynamic surfaces of the plane (Spenser 2004). Obviously,
the propeller was driven by an electric motor.
4.4.8.5 Cost of Hydrogen
The cost of compressed H
2
gas (at 2000 psi or 14 MPa) in steel cylinders is
approximately $100/kg, plus cylinder rental. A large gas cylinder holds
approximately 0.6 kg of compressed H
2
. This price is over 50 times the cost of gaso-
line per unit energy. Another quotation on H
2
gas in cylinders is $0.15/ft.
3
. The
cost of liquid H
2
in a tanker truck (4300 kg or 15,000 gal.) is
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