Posted by harry on February 11, 2010, 7:50 pm
> Harry,
> Well, after a couple days of chasing my tail (nothing new), I think
> I've finally tracked down my trouble, the numbers I remembered for
> gasoline (14.7:1) and methanol (6.5:1) are Stoichiometric ratios and
> my spread-sheet calculates air/fuel ratios and there mot exactly the
> same thing.
> It seems Stoichiometric ratio considers air as just nitrogen and
> oxygen where I was also considering the argon and CO2 present in air,
> also I read somewhere on-line that the Stoichiometric ratio for
> gasoline (petrol) is based on a different chemical mixture.
> Anyway, it seems I was remembering Stoichiometric ratios and
> calculating air/fuel ratios, but I'm pretty confident now that the
> calculations are proper for my purposes.
> Thanks for the link though, densities and specific gravities are next,
> but at some point I'll go after heat values.
> I'm old enough to have learned the imperial system in school and have
> no clue what they teach these days, but I do use wikipedia a lot, so
> over the last year or so I've been writing a series of conversion
> routines for my spread-sheets so I have less and less trouble
> understanding the results of metric equations.
> Curbie
BTW do you have skype?
Posted by Curbie on February 11, 2010, 9:11 pm
Yes.
>BTW do you have skype?
Posted by harry on February 12, 2010, 7:17 pm
> Yes.
> >BTW do you have skype?- Hide quoted text -
> - Show quoted text -
Well give me a call. Or I'll call you.
Posted by harry on February 11, 2010, 7:54 pm
> Harry,
> Well, after a couple days of chasing my tail (nothing new), I think
> I've finally tracked down my trouble, the numbers I remembered for
> gasoline (14.7:1) and methanol (6.5:1) are Stoichiometric ratios and
> my spread-sheet calculates air/fuel ratios and there mot exactly the
> same thing.
> It seems Stoichiometric ratio considers air as just nitrogen and
> oxygen where I was also considering the argon and CO2 present in air,
> also I read somewhere on-line that the Stoichiometric ratio for
> gasoline (petrol) is based on a different chemical mixture.
> Anyway, it seems I was remembering Stoichiometric ratios and
> calculating air/fuel ratios, but I'm pretty confident now that the
> calculations are proper for my purposes.
> Thanks for the link though, densities and specific gravities are next,
> but at some point I'll go after heat values.
> I'm old enough to have learned the imperial system in school and have
> no clue what they teach these days, but I do use wikipedia a lot, so
> over the last year or so I've been writing a series of conversion
> routines for my spread-sheets so I have less and less trouble
> understanding the results of metric equations.
> Curbie
Petrol is a mixture of lots of different liquids and dissolved gases.
If you're intent on being that accurate, you'd need to know the exact
composition, it varies from manufacturer to manufacturer. Probably
commercial secrets.
Posted by Curbie on February 11, 2010, 9:36 pm
Harry,
I agree some fuels are mixtures; I'm using ideal chemistry for
Gasoline (octane), #2 diesel (cetane), SVO (I think canola/rapeseed),
and bio-diesel (don't know yet). The point isn't prefect accuracy, but
rather a mathematical equivalence between the fuels.
Curbie
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> Well, after a couple days of chasing my tail (nothing new), I think
> I've finally tracked down my trouble, the numbers I remembered for
> gasoline (14.7:1) and methanol (6.5:1) are Stoichiometric ratios and
> my spread-sheet calculates air/fuel ratios and there mot exactly the
> same thing.
> It seems Stoichiometric ratio considers air as just nitrogen and
> oxygen where I was also considering the argon and CO2 present in air,
> also I read somewhere on-line that the Stoichiometric ratio for
> gasoline (petrol) is based on a different chemical mixture.
> Anyway, it seems I was remembering Stoichiometric ratios and
> calculating air/fuel ratios, but I'm pretty confident now that the
> calculations are proper for my purposes.
> Thanks for the link though, densities and specific gravities are next,
> but at some point I'll go after heat values.
> I'm old enough to have learned the imperial system in school and have
> no clue what they teach these days, but I do use wikipedia a lot, so
> over the last year or so I've been writing a series of conversion
> routines for my spread-sheets so I have less and less trouble
> understanding the results of metric equations.
> Curbie