Date: 21 Nov 96 03:02:20 From: firstname.lastname@example.org (Woodhams) Organization: University of Auckland References: 1 2 3 4 5 Followups: 1
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email@example.com (Tim Russell) writes: >H2 powered jets are not new it was tested in the 50'a. >I read a quote that H2 was a "terrific fuel for turbines" >I expect that hydrogen will replace fossel fuels in the future >Let's see, you get it from water, when it burns the byproduct is water >do you see a benifit. But you need electricity to create the hydrogen. If this electricity comes from burning fossil fuels, *more* fossil fuel will be used than currently (because the hydrogen creation process is not 100% efficient, extra energy will be needed for cryogenics, and the low density of liquid hydrogen implies larger planes for the same payload which implies more drag.) On the other hand, the pollution will be at ground level, where it may be less damaging, and can be processed by flue gas scrubbers etc. which can't be put on an airplane. The choice of fossil fuels to use is greater. Some alternative energy sources (e.g. windmills on ocean buoys) have troubles linking to the electricity grid, so for these it may make sense to store the energy by electrolizing hydrogen out of water, and have ships come to empty the hydrogen tanks every so often. I've read in Aviation Leak about the possibility of airplanes that are basically a giant wing that flies at an angle. As I recall, these planes had a lot of volume per payload, and so would seem to go well with hydrogen power. Can somebody technical comment on this?