On 9/23/05, Mike Weaver <[EMAIL PROTECTED]> wrote:
Now that'll be a mess to clean up. Should've bought my keyboard cover
when you had the chance...
Fred Finch wrote:
> I think my head just exploded...
>
> On 9/23/05, *Appal Energy* < [EMAIL PROTECTED]
> <mailto:[EMAIL PROTECTED]>> wrote:
>
> Ray,
>
> > so it uses around 26 tons of fuel in 800
> > miles but they say they put out 28 tons
> > of co2 in the same distance?????
>
> This is a the short version of a long-winded explanation as to why
> the
> weight of carbon dioxide appears to be so disproportionate after
> burning
> jet fuel (or any fuel).
>
> Jet fuel is a mixture of long, carbon-chain and carbon-ring molecules,
> including paraffinic, olefinic, naphthenic and aromatic
> hydrocarbons. So
> there is no overly simple method of calculating how many carbon
> molecules are in liter of fuel (at least not without a sample of
> it and
> a lab).
>
> However, just for mind candy, take a look at a biodiesel molecule
> with
> sixteen carbons lined up in a chain. Each has one hydrogen molecule
> attached above and below it (two). One end carbon also has a hydrogen
> attached to the side of it. The other end carbon has a hydroxyl group
> (an oxygen and hydrogen molecule) attached to it. That essentially
> means
> that there are 33 plus 1 hydrogen atoms, 1 oxygen atom and 16 carbon
> atoms for every biodiesel molecule that ha 16 carbons in its chain.
> (Some have a few more carbons and some have less, depending upon the
> type of fatty acid (oil) they were formed from.)
>
> Hydrogen has a molecular weight of one. Oxygen has a molecular
> weight of
> sixteen, which means it's sixteen times heavier than hydrogen. Carbon
> has a molecular weight of twelve. For every hydrogen burned off the
> biodiesel (or jet fuel) molecule, at least one oxygen molecule
> re-attaches. If carbon monoxide is produced, then only one oxygen
> attaches. If carbon dioxide is made then two oxygen molecules attach.
>
> So, for simplicity's sake, when two hydrogens are burnt off one
> carbon
> (C+H+H=14), one or two oxygens take the hydrogen's place (C+O=28) or
> (C+O+O=44). That makes each post combustion molecule with a carbon
> in it
> two or three times heavier after combustion than before.
>
> If a person wanted to get more precise, some fuel isn't completely
> burnt
> in the turbine, meaning that handfuls of hydrogen and carbon molecules
> exit the combustion process partially intact. That means that the
> hydrogen-oxygen exchange isn't exactly one or two to one
>
> But very roughly put and depending on the efficiency of
> combustion, it's
> not too difficult to see that one pound of a specific type of fuel
> going
> into a turbine or engine (a long carbon chain) can turn into two or
> three plus pounds of CO2 coming out.
>
> Todd Swearingen
>
> >Specs on the current model Boeing 747-400, 57,000 U.S. gallons fuel
> >capacity with 8,000 mile range so it gets something like 6-9
> gallons a
> >mile. so lets say 8 gallons/mile, at around 8 pounds per gallon,= 65
> >pounds of fuel per mile... so it uses around 26 tons of fuel
> in 800
> >miles but they say they put out 28 tons of co2 in the same
> distance?????
> >
> >thats interesting...
> >
> >Ray J
> >
> >
> >
> >
> >>Just seen this on our BBC TV channel " every 800 miles travelled
> by a jumbo
> >>jet dumps 28 tons of CO2 into the atmosphere." Chris
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
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